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Reference: 301-P-9050089-ENG-04
Issue: 09.2025
Proportional Directional Valve System
in Sectional Design
Series SC 18
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Contents Page
1 General 5
............................................................................
1.1 Description 5
...................................................................
1.2 Advantages 5
..................................................................
1.3 Application
examples 5
..........................................................
2 Technical
data 5
......................................................................
3 Inlet
Modules 7
.......................................................................
3.1 Module
type
G:
Non-Functional,
with
Line
Connections 7
.............................
3.2 Module
type
H:
Load-Sensing
Pressure
Relief 8
.....................................
3.3 Module
type
M:
System
Pressure
Relief 9
..........................................
3.4 Module
Type
N:
System
Pressure
Relief
and
Load-Sensing
Pressure
Relief 10
...........
3.5 Module
type
V:
3-Way-Pressure
Compensator
with
System
Pressure
Relief 11
...........
3.6 Pilot-Pressure
conditioning 12
.....................................................
3.7 Pilot
pressure
Cut-Off
/
Pressure
Peak
Reduction 14
..................................
3.8 Ordering
Code 15
................................................................
3.9 Dimensions
17
..................................................................
4 Actuator
modules 20
...................................................................
4.1 Module
Configuration 20
..........................................................
4.2 Spool
types
for
the
Pressure
Compensator 22
.......................................
4.3 Valve
Housing
Variants 24
........................................................
4.4 Primary
Pressure
Cut-Off 26
.......................................................
4.5 Main
Spool 29
...................................................................
4.6 Actuation
Types 33
...............................................................
4.7 Secondary
Valves 47
.............................................................
4.8 Ordering
code 49
................................................................
4.9 Dimensions 53
..................................................................
5End
module 61
........................................................................
5.1 End
Module
(no
control
function) 61
................................................
5.2 End
Module
with
additional
P
and
T
Ports 61
........................................
5.3 End
Module
with
additional
XL1
Port 61
.............................................
5.4 Ordering
Code 62
................................................................
5.5 Dimensions 63
..................................................................
6 Special
Modules 65
....................................................................
6.1 Combination
with
L.8S
Series 65
...................................................
6.2 Combination
with
SC12
series 65
..................................................
6.3 Combination
with
SC22
series 65
..................................................
6.4 Combination
with
SVC25
series 65
.................................................
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7 Solenoid
valves 66
.....................................................................
7.1 Electro-Hydraulic
On/Off
Pilot
Valves 66
............................................
7.2 Electro-Hydraulic
Pilot
Valves,
Proportional 66
.......................................
7.3 On-Board
Electronics:
Electro-Hydraulic
Actuator
(EHA) 67
............................
7.4 Directional
valves 67
.............................................................
7.5 Proportional
Pressure
Relief
Valves 68
.............................................
7.6 Connector-Socket
Type 68
........................................................
8 Secondary
Valves
(Technical
Data) 69
....................................................
8.1 Valve
Type
S:
Sealing
Plug 69
.....................................................
8.2 Valve
type
M:
Line
Connection 69
..................................................
8.3 Valve
Type
N:
Make-Up
Check
Valve 69
............................................
8.4 Valve
type
K:
Adjustable
Shock
Valve
with
Make-Up
Function 70
.......................
8.5 Valve
type
D:
Pressure
Relief
Valve 70
.............................................
8.6 Characteristic
Curves 70
..........................................................
9 Sensors 71
...........................................................................
9.1 Displacement
Sensor 71
..........................................................
9.2 Connector-Socket
Type 71
........................................................
10 Ordering
Examples 72
..................................................................
10.1 Valve
System
without
Bolt-On
Plates 72
............................................
10.2 Valve
System
with
Bolt-On
Plates 74
...............................................
11 Dimension
of
the
Unit 76
................................................................
11.1 Valve
System
without
Bolt-On
Sections 76
..........................................
11.2 Valve
System
with
Bolt-On
Sections 77
.............................................
12 Note 78
...............................................................................
13 Related
Datasheets 78
.................................................................
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1 General
1.1 Description
Our sectional proportional valves regulate the flow rate to
the actuator by means of an internal closed-loop control
system. Load-independent flow control is guaranteed by in
dividual pressure compensators upstream of each propor
tional directional valve (load-sensing principle).
The highly adaptable modular system consists of an inlet
module, actuator modules (up to eight) and an end module.
The system is specially designed for use in mobile hydraul
ics. The user can be assured that the right system is always
available for every application.
1.2 Advantages
S compact sectional construction
S load sensing
S individual supply cut-off for each actuator port
S actuator modules with individual pressure compensators
and optional primary pressure relief valves
S load-independent flow control, even in
parallel operation of several actuators.
S compatible with variable- and fixed displacement pump
systems
1.3 Application examples
S Mobile cranes
S Ground drilling rigs
S Container forklifts
S Applications with explosion-protection reqiuirements
(special design; please contact Bucher Hydraulics)
2 Technical data
General characteristics Unit Description, value
Design Proportional valves, sectional design,
max. 8 sections
Types of operators S electro-hydraulic proportional
S hydraulic
S manual (oil-tight sealed)
S electro-hydraulic proportional - manual, combined
S electro-hydraulic proportional - hydraulic, combined
S for other types, please contact Bucher
Ports S threaded ports according to ISO 1179-Part 1 (Whit
worth pipe threads)
S threaded ports according to ISO 11926-Part 1
(UNF threads)
S flange connections according to ISO 6162
(SAE flange)
Mounting position any mounting position, preferably with regard to
self-bleeding
Ambient temperature range °C -30 … +60
Hydraulic characteristics Unit Description, value
Hydraulic fluid HL and HLP mineral oil to DIN 51524;
for other fluids please contact Bucher Hydraulics
Hydraulic fluid temperature range °C -20 … +80, recommended +20 … +60
Viscosity range mm
2
/s [cSt] 10 … 380, recommended 15…250
Maximum permissible contamination level of the hy
draulic fluid
cleanliness class 20/18/15 according to ISO 4406
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Description, valueUnitHydraulic characteristics
Maximum inlet flow rate l/min 400
Maximum actuator flow rate
S pressure balance without load-holding function
S pressure balance with load-holding function
l/min
260
190
Maximum pump pressure bar 370
Maximum load pressure bar 420
Maximum tank pressure (port T) bar 50
Maximum tank pressure for electrohydraulic pilot
control (Y or T port)
bar 5
Hydraulic operation Unit Description, value
Pilot-pressure range bar 6 … 20
Maximum allowable pilot circuit pressure bar 50
Electrical characteristics
Electrical data: see Chapter 7: Solenoid valves or Chapter 9: Sensors
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3 Inlet Modules
3.1 Module type G: Non-Functional, with Line Connections
Type and symbol Description
SC18- G_000-…-…-…-…- B- V…
TMPPXL YX
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
G1
G2
S without system pressure relief
S without load-sensing pressure relief
SC18-GF000-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = G 1/4“
S test point MP = G 1/4“
SC18-GG000-…
S P = G 1 1/4“
S T = G 1 1/2“
S X, XL, Y = G 1/4“
S test point MP = G 1/4“
SC18-GU000-…
S test point MP = 9/16-18UNF
SC18-GV000-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = 9/16-18UNF
S test point MP = 9/16-18UNF
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3.2 Module type H: Load-Sensing Pressure Relief
Type and symbol Description
SC18- H_000-…-…-…-…- B- V…- D4=***
TMPPXL YX
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
***bar
D4
G1
G2
S without pressure relief
S load-sensing pressure relief
S pressure setting in bar for system pressure relief
(3-digits) (D4=…)
SC18-HF000-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = G 1/4“
S test point MP = G 1/4“
SC18-HG000-…
S P = G 1 1/4“
S T = G 1 1/2“
S X, XL, Y = G 1/4“
S test point MP = G 1/4“
SC18-HU000-…
S P = 1 5/8-12UN
S T = 1 7/8-12UN
S X, XL, Y = 9/16-18UNF
S test point MP = 9/16-18UNF
SC18-HV000-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = 9/16-18UNF
S test point MP = 9/16-18UNF
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3.3 Module type M: System Pressure Relief
Type and symbol Description
SC18- M_***-…-…-…-…- B-V…
TMPPXL YX
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
G1
G2
D1
***bar
DUE1
X1
S system pressure relief
S pressure setting in bar for system pressure relief
(3-digits)
S without load-sensing pressure relief
SC18-MF***-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = G 1/4“
S X1 = G 1/4“ : plugged
S test point MP = G 1/4“
SC18-MG***-…
S P = G 1 1/4“
S T = G 1 1/2“
S X, XL, Y = G 1/4“
S X1 = G 1/4“ : plugged
S test point MP = G 1/4“
SC18-MU***-…
S P = 1 5/8-12UN
S T = 1 7/8-12UN
S X, XL, Y = 9/16-18UNF
S X1 = 9/16-18UNF : plugged
S test point MP = 9/16-18UNF
SC18-MV***-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = 9/16-18UNF
S X1 = 9/16-18UNF : plugged
S test point MP = 9/16-18UNF
IMPORTANT!
The system pressure relief setting in the inlet module must be 20 bar higher than the highest value of the
primary-pressure cut-off in the actuator modules.
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3.4 Module Type N: System Pressure Relief and Load-Sensing Pressure Relief
Type and symbol Description
SC18- N_***-…-…-…-…- B- V…- D4=***
TMPPXL YX
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
G1
G2
D1
***bar
DUE1
D4
***bar
X1
S system pressure relief
S pressure setting in bar for system pressure relief
(3-digits)
S load-sensing pressure relief
S pressure setting in bar for load-sensing pressure
relief (3-digits) (D4=…)
SC18-NF***-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = G 1/4“
S X1 = G 1/4“ : plugged
S test point MP = G 1/4“
SC18-NG***-…
S P = G 1 1/4“
S T = G 1 1/2“
S X, XL, Y = G 1/4“
S X1 = G 1/4“ : plugged
S test point MP = G 1/4“
SC18-NU***-…
S P = 1 5/8-12UN
S T = 1 7/8-12UN
S X, XL, Y = 9/16-18UNF
S X1 = 9/16-18UNF : plugged
S test point MP = 9/16-18UNF
SC18-NV***-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = 9/16-18UNF
S X1 = G 1/4“ : plugged
S test point MP = 9/16-18UNF
IMPORTANT!
The system pressure relief setting in the inlet module must be 20 bar higher than the value of the
load-sensing pressure relief.
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3.5 Module type V: 3-Way-Pressure Compensator with System Pressure Relief
Type and symbol Description
SC18- V_***-…-…-…-…- B- V…
DUE1
G1
G2
***bar
D1
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL YX
S 3-way-pressure compensator with system pressure
relief
S pressure setting in bar for system pressure relief
(3-digits)
SC18-VF***-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = G 1/4“
S test point MP = G 1/4“
SC18-VG***-…
S P = G 1 1/4“
S T = G 1 1/2“
S X, XL, Y = G 1/4“
S test point MP = G 1/4“
SC18-VU***-…
S P = 1 5/8-12UN
S T = 1 7/8-12UN
S X, XL, Y = 9/16-18UNF
S test point MP = 9/16-18UNF
SC18-VV***-…
S P = flange DN25 (SAE 1”) (6000 PSI)
S T = flange DN32 (SAE 1 1/4”) (3000 PSI)
S X, XL, Y = 9/16-18UNF
S test point MP = 9/16-18UNF
3-way-pressure compensator (control curve)
Q = pump flow rate P -> T
Δp = pump pressure - tank pressure
IMPORTANT!
The system pressure relief setting in the inlet module must be 20 bar higher than the value of the
primary-pressure cut-off in the actuator modules.
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3.6 Pilot-Pressure conditioning
3.6.1 Without Pilot-Pressure Conditioning
Type and symbol Description
SC18-…- 000-0000-…-…- B- V…
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X
G1
G2
S pilot oil supply: internal
S pilot oil unloading: internal
S without pilot-pressure conditioning
Connection type F or G
S X = G1/4“: plugged
S Y = G1/4“: plugged
Connection type U or V
S X = 9/16-18UNF: plugged
S Y = 9/16-18UNF: plugged
SC18-…- 010-0000-…-…- B- V…
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X
G1
G2
S pilot oil supply: internal
S pilot oil unloading: external
S without pilot-pressure conditioning
Connection type thread F or G
S X = G1/4“: plugged
S Y = G1/4“: open
Connection type U or V
S X = 9/16-18UNF: plugged
S Y = 9/16-18UNF: open
SC18-…- 100-0000-…-…- B- V…
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X
G1
G2
S pilot oil supply: external
S pilot oil unloading: internal
S without pilot-pressure conditioning
Connection type F or G
S X = G1/4“: open
S Y = G1/4“: plugged
Connection type U or V
S X = 9/16-18UNF: open
S Y = 9/16-18UNF: plugged
SC18-…- 110-0000-…-…- B- V…
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X
G1
G2
S pilot oil supply: external
S pilot oil unloading: external
S without pilot-pressure conditioning
Connection type F or G
S X = G1/4“: open
S Y = G1/4“: open
Connection type U or V
S X = 9/16-18UNF: open
S Y = 9/16-18UNF: open
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3.6.2 With Pilot-Pressure Conditioning
Type and symbol Description
SC18-…- 001-3545-…-…- B- V…
DUE0
G2
D2
35bar
D3 45bar
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X2
S pilot oil supply : internal
S pilot oil unloading: internal
S pilot-pressure conditioning
Connection type F or G
S X2 = G 1/4“ : plugged
S Y = G 1/4“ : plugged
Connection type U or V
S X2 = 9/16-18UNF: plugged
S Y = 9/16-18UNF plugged
SC18-…- 011-3545-…-…-B- V…
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X2
DUE0
G2
D2 35bar
D3 45bar
S pilot-oil supply: internal
S pilot oil unloading: external
S pilot-pressure conditioning
Connection type F or G
S X2 = G1/4“: plugged
S Y = G1/4“: open
Connection type U or V
S X2 = 9/16-18UNF: plugged
S Y = 9/16-18UNF: open
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Series SC 18
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3.7 Pilot pressure Cut-Off / Pressure Peak Reduction
Type and symbol Description
SC18-…-…-…- 00X-00- B- V…
***bar
D1
DUE1
G1
G2
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X
X1
S without pilot pressure cut-off
S without pressure peak reduction
SC18-…-…-…- 00X-20- B- V…- V5=***
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X
***bar
D1
DUE1
G1
G2
DUE2
V5
***bar
X1
S without pilot pressure cut-off
S pressure peak reduction
S pressure setting in bar for pressure-peak reduction
(3-digits) (V5=…)
SC18-…-…-…- 11X-00- B- V2
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
TMPPXL Y
X
***bar
D1
DUE1
G1
G2
V1
S
X1
S pilot-pressure cut-off: line X2
S pilot-pressure cut-off: line X3
S 3/2 directional valve (de-energized closed)
(for more information, see Chapter 7: Solenoid
valves)
S voltage: 28 V
S current: DC
S AMP Junior-Timer 2-pin (IP65)
S without pressure-peak reduction
S additional port: S
Port thread F resp. G
S S = G3/8“: plugged
Port thread U resp. V
S S = 3/4-16 UNF: plugged
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3.8 Ordering Code
3.8.1 Ordering Code for Inlet Section Part 1
SC 18 - M G 370 - 1 0 1 - 35 45 -
SC Valve series
18 Nominal size
Module options
G without system pressure relief
without load-sensing pressure relief
H without system pressure relief
with load-sensing pressure relief
M with system pressure relief
without load-sensing pressure relief
N with system pressure relief
with load-sensing pressure relief
V 3-way pressure compensator
and system pressure relief
Connection type
F thread (ISO 1179 Part 1 - BSPP / Whitworth pipe thread)
flange (ISO 6162 SAE flange); flange mounting: metric
G thread (ISO 1179 Part 1 - PSBB / Withworth pipe thread)
without flange
U thread (ISO 11926 Part 1 UNF thread)
without flange
V thread (ISO 11926 Part 1 UNF thread)
flange (ISO 6162 SAE flange); flange mounting: UNC
System pressure relief [bar]
000 for module variants G and H
370 specify the desired setting (example 370 bar)
Pilot oil supply
0 internal port X resp. X2: plugged
1 external port X resp. X2: open
Pilot oil unloading
0 internal port Y: plugged
1 external port Y: open
Pilot-pressure conditioning
0 without
1 with
Pilot-pressure reduction [bar]
predefined by Bucher Hydraulics
Pilot-pressure relief [bar]
predefined by Bucher Hydraulics
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3.8.2 Ordering Code for Inlet Section, Part 2
0 0 X - 0 0 - B - V0 T1
Pilot pressure cut-off: X2
0 without cut-off
1 with cut-off
Pilot pressure cut-off: X3
0 without cut-off
1 with cut-off
Design feature
data specified by Bucher Hydraulics
Pressure peak reduction
0 without
2 with
Electronic Undervoltage Management
data specified by Bucher Hydraulics
Serie identifier
data specified by Bucher Hydraulics
Option
… possible options: see Chapter 3.8.3
Nameplate variants
T1 version: standard (custom version on request)
3.8.3 Options
V0 version: standard
V2 additional port: S
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3.9 Dimensions
3.9.1 Dimensions SC18-G… and SC18-M…
Type and dimensions Type and dimensions
SC18- GF _ _ _-_ _ 0-...-00 X- 0 0-B- V0
SC18- GV _ _ _-_ _ 0-...-00 X- 0 0-B- V0
SC18- MF _ _ _-_ _ 0-...-00 X- 0 0-B- V0
SC18- MV _ _ _-_ _ 0-...-00 X- 0 0-B- V0
SC18- GG _ _ _-_ _ 0-...-00 X- 0 0-B- V0
SC18- GU _ _ _-_ _ 0-...-00 X- 0 0-B- V0
SC18- MG _ _ _-_ _ 0-...-00 X- 0 0-B- V0
SC18- MU _ _ _-_ _ 0-...-00 X- 0 0-B- V0
64
68.5
14
0
70
0
140
D1
78
0
103
146
D1
11
0
50
30
20
149
153.5
160
164.5
205
33.5
0
78
119.5
147
X
13
0
42
66.5
Y
112
58.7
30.257.2
D3
D2
27.8
40
0
69
71.4
SC18-GF
SC18-GV
SC18-MF
SC18-MV
= only for SC18-M
14
0
64
68.5
149
153.5
160
164.5
205
33.5
0
39
89
108
147
13
0
31
66.5
98
101
40
0
70
0
140
D1
D1
12
0
50
30
65
0
98
146
20
64
68.5
SC18-MG
SC18-MU
SC18-GG
SC18-GU
= only for SC18-M
3.9.1.1 Connection Sizes
Port
ISO 1179-1 ISO 11926-1
Similar to
ISO 6162-1
(3000 PSI)
Similar to
ISO 11926-1
(6000 PSI)
P Pump G 1 1/4“ 1 5/8-12UN DN25 (SAE 1)
T Tank G 1 1/2“ 1 7/8-12UN DN32 (SAE 1 1/4)
X Pilot oil supply G 1/4“ 9/16-18UNF
X1 External pressure valve port G 1/4“ 9/16-18UNF
XL Load sensing G 1/4“ 9/16-18UNF
Y Pilot oil unloading G 1/4“ 9/16-18UNF
MP Test point, pump G 1/4“ 9/16-18UNF
3.9.1.2 Mounting Threads
Ordering code
Module Flange
D1 Depth D2 Depth D3 Depth
SC18- _F_ _ _ -… M10 17 M12 23 M10 22
SC18- _G_ _ _ -… M10 17
SC18- _U_ _ _ -… 3/8-16UNC 16
SC18- _V_ _ _ -… 3/8-16UNC 16 7/16-14UNC 27 7/16-14UNC 25
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3.9.1.3 Dimensions Port Y
Ordering code
Port Y (coordinates)
X Y
SC18- _GF_ _ _ -_ _0-…- 00X-00-B- V0
17,5 98
SC18- _GV_ _ _ -_ _0-…- 00X-00-B- V0
SC18- _MF_ _ _ -_ _0-…- 00X-00-B- V0
63 100
SC18- _MV_ _ _ -_ _0-…- 00X-00-B- V0
3.9.2 Dimensions SC18-M…
Type and dimensions Type and dimensions
SC18- MF_ _ _-_ _1-...- 00 X-00-B- V0
SC18- MV_ _ _-_ _1-...- 00 X-00-B- V0
SC18- MG_ _ _-_ _1-...- 00 X-00-B- V0
SC18- MU_ _ _-_ _1-...- 00 X-00-B- V0
30
0
50
20
0
78
150
D3
58.7
30.2
16045
ca.268
149
ca.150
33.5
0
63
78
119.5
146
13
0
42
57
100
112
D2
27.8
70
0
140
40
0
64
68.5
69
71.4
57.2
14
0
D1
D1
44
0
37
MP
MP
SC18-MF SC18-MV
14
0
64
68.5
20
0
65
146
30
0
50
D1
70
0
140
D1
40
0
149
ca. 150
160
ca. 268
13
0
31
80
64
101
33.5
0
105
146
85
39
45
36
0
37
MP
MP
3.9.2.1 Connection Sizes
Port
ISO 1179-1 ISO 11926-1
Similar to
ISO 6162-1
(3000 PSI)
Similar to
ISO 6162-1
(3000 PSI)
P Pump G 1 1/4“ 1 5/8-12UN DN25 (SAE 1)
T Tank G 1 1/2“ 1 7/8-12UN DN32 (SAE 1 1/4)
X2 Pilot oil supply G 1/4“ 9/16-18UNF
X1 External pressure valve port G 1/4“ 9/16-18UNF
XL Load sensing G 1/4“ 9/16-18UNF
Y Pilot oil unloading G 1/4“ 9/16-18UNF
MP Test point, pump G 1/4“ 9/16-18UNF
3.9.2.2 Mounting Thread
Ordering code
Module Flange
D1 Depth D2 Depth D3 Depth
SC18- _F _ _ _ -… M10 17 M12 23 M10 22
SC18- _G _ _ _ -… M10 17
SC18- _U _ _ _ -… 3/8-16UNC 16
SC18- _V _ _ _ -… 3/8-16UNC 16 7/16-14UNC 27 7/16-14UNC 25
301-P-9050089-ENG-04/09.2025
Series SC 18
19/78
3.9.3 Dimensions SC18-M… and SC18-V…
Type and dimensions Type and dimensions
SC18- MG_ _ _-_ _0-...-00X-20- B- V2
SC18- MU_ _ _-_ _0-...-00X-20- B- V2
SC18- VG_ _ _-_ _0-...-00X-00- B- V0
SC18- VU_ _ _-_ _0-...-00X-00- B- V0
65
0
146
120
D1
64
68.5
14
0
40
0
70
0
140
D1
16045
ca. 266
39
0
102
89
147
149
34
0
50
98
101
100
30
0
50
117
47
16
153.5
149
S
S
10
0
113
160
64
68.5
14
0
160
0
D1
149
4.5
223.5
170
174.5
16
0
32
70.5
66.5
105
79
0
75
125
157
128
50
0
13
0
54
D1
3.9.3.1 Connection Sizes
Connection ISO 1179-1 ISO 11926-2
P Pump G 1 1/4“ 1 5/8-12UN
T Tank G 1 1/2“ 1 7/8-12UN
S Storage G 3/8“ 3/4-16-UN
X, X2 Piloit oil supply G 1/4“ 9/16-18UNF
X1 Connection ext. Pressure valve G 1/4“ 9/16-18UNF
XL Load sensing G 1/4“ 9/16-18UNF
Y Pilot oil unloading G 1/4“ 9/16-18UNF
MP Test point pump G 1/4“ 9/16-18UNF
3.9.3.2 Mounting Threads
Ordering code
Module
D1 Depth
SC18- _G_ _ _ -… M10 17
SC18- _U_ _ _ -… 3/8-16UNC 16
301-P-9050089-ENG-04/09.2025
Series SC 18
20/78
4 Actuator modules
4.1 Module Configuration
The SC18 series valve is a proportional directional control valve that works in accordance with the load-sensing principle.
The main control spool (3) determines the direction of flow and the rate of flow to the actuator ports A and B. When the main
control spool is in the neutral position, there is no connection from pump port P to the actuator ports A and B. The load-sensing
galleries are unloaded to tank. In this position, the pressure compensator spool (1) is pushed to the left against the pressure
compensator control spring (2) by the pump pressure.
Adjustable stroke limiters (4, 5) determine the maximum flow rate for the respective actuator.
The pressure reducing valves (6) regulate the position of the main control spool. The magnitude of the electrical current at
the pressure reducing valve determines the level of the pilot pressure. The pressure reducing valves are connected to the
spring chambers of the main control spool, and the pilot pressure from one or other of these valves acts on the respective
end face of the spool and thus controls the spool stroke (P -> A or P -> B).
The 2-way pressure compensator has several functions. When the proportional valve is operated, the load-sensing 4 galleries
(11) establish a connection between actuator port A or B and the spring chamber of the pressure compensator. The load pres
sure, assisted by the pressure compensator control spring (2), moves the pressure compensator spool (1) to the right against
the reduced pump pressure (10) and into its control position. This process ensures that the flow rate through the actuator mod
ule is constantly controlled if there are pressure changes at the pump or the actuator ports. The flow rate to the actuator re
mains constant even under varying load pressures.
If the load pressure exceeds the value set at the pilot pressure relief valve (8), the pressure compensator spool (1) takes on
the function of a pressure reducing valve. This restricts the flow rate from the pump to the actuator (primary pressure cut-off).
Backflow of the hydraulic fluid (A -> P or B -> P) can be prevented by using a pressure compensator with a load-holding func
tion. This pressure compensator function is not leak-free. When using load-holding valves (load control valves, pilot-operated
non-return valves), this pressure compensator function is not required.
The highest load pressure is signalled to the pump via shuttle valves (9).
6
a
b
P
Y1
Y3
X3
Y2
X2
TA
TB
TB1
TA1
AB
7
4
6
211011 8 9 311
5
7
Main control spool in neutral position (spool type C – port A connected to TA, port B connected to TB). Pressure compensator
spool without load-holding function (actuator section Y).
301-P-9050089-ENG-04/09.2025
Series SC 18
21/78
4.1.1 Schematic
8
TA
TB
P
XL Y2
Y1
X2
Y3X3
D6
D7
A
B
b1
a1
DUE7
DUE8
1
2
3
5
4
6
7
9
7
6
8
TA1
TB1
8
4.1.1.1 Description
Pos Description
1 Pressure compensator spool
2 Pressure compensator control spring
3 Main control spool
4 Stroke limiter, side A
5 Stroke-limiter, side B
6 Pressure reducing valve
7 Damping orifice (pressure reducing valve)
8 Pilot pressure relief valve
9 Shuttle valve (load sensing system)
10 Reduced pump pressure
11 Load-sensing channel
4.1.1.2 Port
Port
P Pump
A, B Actuator
TA, TA1, TB, TB1 Tank
X2, X3 Pilot oil supply
XL Load sensing
Y1
Tank
(pilot pressure relief valve)
Y2, Y3 Pilot oil unloading
301-P-9050089-ENG-04/09.2025
Series SC 18
22/78
4.2 Spool types for the Pressure Compensator
4.2.1 Pressure Compensator without Load-Holding Function
Type and symbol Description
SC18- Y…-…/…-…/…-…-…-…-…/…- B-V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S pressure compensator without load-holding function
4.2.2 Pressure Compensator with Load-Holding Function
Type and symbol Description
SC18- Z…-…/…-…/…-…-…-…-…/…- B-V 92
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S load-holding function is not leak-free
S tapping point for reduced pump pressure is blocked
Caution:
Maximum flow rate 190 l/min
4.2.3 Without Pressure Compensator Function
Type and symbol Description
SC18- T…-…/…-…/…-…-…-…-…/…- B-V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S pressure compensator is deactivated
S no load-holding function
Caution:
The actuator flow depends on pump pressure and
load pressure.
301-P-9050089-ENG-04/09.2025
Series SC 18
23/78
4.2.4 Load-Holding Valve Function
Type and symbol Description
SC18-R…-…/…-…/…-…-…-…-…/…-B-V 92
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S pressure compensator is deactivated
S load-holding function is not leak-free
S tapping point for reduced pump pressure is blocked
Caution:
The actuator flow depends on pump pressure and
load pressure.
301-P-9050089-ENG-04/09.2025
Series SC 18
24/78
4.3 Valve Housing Variants
Type and symbol Description
SC18-_ _ _0 -…/…-…/…-…-…-…-…/…- B - V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S without spacer plate
SC18-_ _F0 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): open
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: metric
SC18-_ _G0 -…
S port A = G1”: open
S port B = G1”: open
SC18-_ _U0 -…
S port A = 1 5/16-12UN: open
S port A = 1 5/16-12UN: open
SC18-_ _V0 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): open
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: UNC
SC18-_ _ _ 1 -…/…-…/…-...-…-…-…/…- B - V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S spacer plate: width 10mm
SC18-_ _F1 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): open
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: metric
SC18-_ _V1 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): open
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: UNC
flange width > 55mm
Note:The spacer plate must be installed between actuator modules to
prevent collision between flanges of adjacent actuator modules during
assembly.
Note: No spacer plate is required between the actuator module and
the inlet module, or between the actuator module and the end module,
as flange collisions do not occur in those positions.
301-P-9050089-ENG-04/09.2025
Series SC 18
25/78
SC18-_ _ _ 2 -…/…-…/…-...-…-…-…/…- B - V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S without spacer plate
SC18-_ _F2 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): glugged
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: metric
SC18-_ _G2 -…
S port A = G 1”: plugged
S port B = G 1”: open
SC18-_ _U2 -…
S port A = 1 5/16-12UN: plugged
S port B = 1 5/16-12UN: open
SC18-_ _V2 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): glugged
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: UNC
SC18-_ _ _4 -…/…-…/…-...-…-…-…/…- B-V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S with spacer plate: width 10mm
SC18-_ _F4 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): glugged
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: metric
SC18-_ _V4 -…
S port A = flange DN19
(SAE 3/4“) (6000PSI): glugged
S port B = flange DN19
(SAE 3/4“) (6000PSI): open
S flange mounting: UNC
flange width > 55mm
Note:The spacer plate must be installed between actuator modules
to prevent collision between flanges of adjacent actuator modules du
ring assembly.
Note: No spacer plate is required between the actuator module and
the inlet module, or between the actuator module and the end module,
as flange collisions do not occur in those positions.
301-P-9050089-ENG-04/09.2025
Series SC 18
26/78
4.4 Primary Pressure Cut-Off
IMPORTANT!
The system pressure relief setting in the inlet module must be 20 bar higher than the highest value of the primary
pressure cut-off in the actuator module.
4.4.1 2x Primary Pressure Cut-Off
Type and symbol Description
SC18-…- D***/D*** -…/…-…-…-…-…/…- B - V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S pressure setting in bar for actuator port A (3-digit)
S pressure setting in bar for actuator port B (3-digit)
4.4.2 1x Vent plug and 1x Primary Pressure Cut-Off
Name and symbol Description
SC18-…- T000/D*** -…/…-…-…-…-…/…- B - V…
D6
D7
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S vent plug – primary pressure cut-off
(connection: open) for actuator port A
S pressure setting in bar for actuator port B (3-digit)
4.4.3 1x Sealing Plug and 1x Primary Pressure Cut-Off
Name and symbol Description
SC18-…- S000/D*** -…/…-…-…-…-…/…- B - V…
TA
TB
P
XL Y2
Y1
X2
Y3X3
D6
D7
***bar
b1
a1
DUE7
DUE8
TA1
TB1
A
B
S sealing plug - primary pressure cut-off
(connection: blocked) for actuator port A
S pressure setting in bar for actuator port B (3-digit)
301-P-9050089-ENG-04/09.2025
Series SC 18
27/78
4.4.4 Without Primary Pressure Cut-Off
Name and symbol Description
SC18-…- S000/S000 -…/…-…-…-…-…/…- B - V…
D6
A
B
b1
a1
DUE7
DUE8
D7
TA
TB
P
XL Y2
Y1
X2
Y3X3TA1
TB1
S sealing plug - primary-pressure cut-off
(connection: shut off) for actuator port A
S sealing plug - primary-pressure cut-off
(connection: shut off) for actuator port B
4.4.5 Separate Load-Sensing Tap
Type and symbol Description
SC18-…- M000/M000-…/…-...-…-…-…/…- B - V…
D6
A
B
b1
a1
DUE7
DUE8
D7
TA
TB
P
XL Y2
Y1
X2
Y3X3TA1
TB1
Connection type F or G
S port D6 = G1/4“: open
S port D7 = G1/4“: open
Connection type U or V
S port D6 = 9/16-18UNF: open
S port D7 = 9/16-18UNF: open
SC18-…- A***/A***-…/…-...-…-…-…/…- B - V 49
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
D6
***bar
D7
***bar
XLA
XLB
S pressure setting in bar for actuator port A (3-digits)
S pressure setting in bar for actuator port B (3-digits)
Connection type G or H
S port XLA = G1/4“: plugged
S port XLB = G1/4“: plugged
Connection type U or V
S port XLA = 9/16-18UNF: plugged
S port XLB = 9/16-18UNF: plugged
301-P-9050089-ENG-04/09.2025
Series SC 18
28/78
4.4.6 Electro-Proportional Pressure Relief
Type and symbol Description
SC18-…- A000/A000-…/…-...-…-…-…/…- B - V 65
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
V1
S electro-proportional pressure relief with rising
characteristic curve
(for further information, see Chapter 7: Solenoid
valves)
S pressure setting: 350 bar
S voltage: 24 V
S current type: DC
S AMP Junior Timer, 2-pin (IP65)
S characteristic curve, see Chapter 7: Solenoid valves
Caution:
Maximum pressure in the load sensing system: 350 bar
SC18-…- A***/A***-…/…-...-…-…-…/…- A - V 59
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
D6
***bar
D7
***bar
V1
S pressure setting in bar for actuator port A (3-digit)
S pressure setting in bar for actuator port B (3-digit)
S electro-proportional pressure relief with rising
characteristic curve
(for further information, see Chapte. 7: Solenoid
valves)
S pressure setting: 350 bar
S voltage: 24 V
S current type: DC
S AMP Junior Timer, 2-pin (IP65)
S characteristic curve see Chapter 7: Solenoid valves
Caution:
Maximum pressure in the load sensing system: 350 bar
301-P-9050089-ENG-04/09.2025
Series SC 18
29/78
4.4.7 1x Primary-Pressure Cut-Off (A- and B-side together)
Name and symbol Description
SC18-…- A***/A*** -…/…-…-…-…-…/…- A - V 61- D8=***
A
B
b1
a1
DUE7
DUE8
D6
***bar
D7
***bar
D8
***bar
V1
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S pressure setting in bar for actuator port A (3-digit)
S pressure setting in bar for actuator port B (3-digit)
S switchable secondary protection of the load-sensing
pressure
S pressure setting in bar for secondary load-sensing
pressure protection (3-digit) (D8 = …)
S 2/2-way solenoid valve (de-energized closed)
(for more information, see Chapter 7: Solenoid
valves)
S voltage: 24 V
S current type: DC
S AMP Junior Timer, 2-pin (IP65)
Caution:
Maximum pressure in the load sensing system: 350 bar
4.5 Main Spool
4.5.1 Spool with 2 Switching Positions
Name and symbol Description
SC18-…- …/…-…/…-…-…-…-…/…- B - V…
D6
D7
***bar
***bar
A
B
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S spool with 2 switching positions
S control a
ab
AB
TA TBP
4.5.2 Spool with 3 Switching Positions
Name and symbol Description
SC18-…-…/…-…/…-…-…-…-…/…-B-V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
TA
TB XL
PX3
X2
Y3
Y2
Y1
S spool with 3 switching positions
S control a and b
ab
AB
TA TBP
301-P-9050089-ENG-04/09.2025
Series SC 18
30/78
4.5.3 Spool Schematic
4.5.3.1 Main Spool with 2 Switching Positions
Note: For a spool with 2 switching positions (spool position A), the flow rate for actuator port B is specified as the flow rate
of actuator port A.
Type and symbol Description
SC18-…- …/…- 1A_ _ _ / _ _ _A00-…-…-…-…/…- B - V
AB
TA TBP
S spool type 1A
(2 switching position - actuation type a)
S flow rate specification in l/min for actuator port A
(3-digits)
S low rate specification in l/min for actuator port B
(3-digits)
SC18-…- …/…- 1B_ _ _ / _ _ _A00-…-…-…-…/…- B - V
AB
TA TBP
S spool type 1B
(2 switching positions - actuation type a)
S flow rate specification in l/min for actuator port A
(3-digit)
S flow rate specification in l/min for actuator port B
(3-digits)
SC18-…- …/…- 1C_ _ _ / _ _ _A00-…-…-…-…/…- B - V
AB
TA TBP
S spool type 1C
(restricted open center position)
(2 switched positions - actuation type a)
S flow rate specification in l/min for actuator port A
(3-digits)
S flow rate specification in l/min for actuator port B
(3-digits)
SC18-…- …/…- 1CB_ _ _ / _ _ _A00-…-…-…-…/…-B -V
AB
TA TBP
S spool type 1CB
(open center position)
(2 switching positions - actuation type a)
S flow rate specification in l/min for actuator port A
(3-digit)
S flow rate specification in l/min for actuator port B
(3-digits)
SC18-…-…/…- 1D_ _ _ / _ _ _A00-…-…-…-…/…-B-V
AB
TA TBP
S spool type B
S flow rate specification in l/min for actuator port A
(3-digit)
S flow rate specification in l/min for actuator port B
(3-digits)
301-P-9050089-ENG-04/09.2025
Series SC 18
31/78
4.5.3.2 Spool with 3 Switching Positions
Type and symbol Description
SC18-…-…/…- A_ _ _ / _ _ _A00-…-…-…-…/…-B-V
AB
TA TBP
S spool type A
(3 switching positions - control a and b))
S flow rate data in l/min for actuator port A (3-digits)
S flow rate data in l/min for actuator port B (3-digits)
SC18-…- …/…- B_ _ _ / _ _ _A00-…-…-…-…/…-B-V
AB
TA TBP
S spool type B
(3 switching positions - control a and b)
S flow rate data in l/min for actuator port A (3-digits)
S flow rate data in l/min for actuator port B (3-digits)
SC18-…-…/…- C_ _ _ / _ _ _A00-…-…-…-…/…-B-V
AB
TA TBP
S spool type C
(restricted open center position)
(3 switching positions - actuation via ports a and b)
S flow rate data in l/min for actuator port A (3-digits)
S flow rate data in l/min for actuator port B (3-digits)
SC18-…- …/…- CB_ _ _ / _ _ _A00-…-…-…-…/…- B - V
AB
TA TBP
S spool type CB
(open center position)
(3 switching positions - actuation via ports a and b)
S flow rate data in l/min for actuator port A (3-digits)
S flow rate data in l/min for actuator port B (3-digits)
SC18-…-…/…- D_ _ _ / _ _ _A00-…-…-…-…/…-B-V
AB
TA TBP
S spool type D
(3 switching positions - actuation via ports a and b)
S flow rate data in l/min for actuator port A (3-digits)
S flow rate data in l/min for actuator port B (3-digits)
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4.5.4 Flow Rate
4.5.4.1 Symmetrical Spools
Flow rate (A-side / B-side) [l/min]
Compensator Spool Q
A
/Q
B
Q
A
/Q
B
Q
A
/Q
B
Q
A
/Q
B
Q
A
/Q
B
Q
A
/Q
B
Y
row 1 260/260 210/210 160/160 110/110 070/070 030/030
row 1 230/230 190/190 130/130 090/090 050/050 015/015
Z
row 1 190/190 150/150 115/115 080/080 050/050 020/020
row 1 170/170 130/130 095/095 065/065 035/035 010/010
R
T
CAUTION:
For pressure compensators R and T, the configuration is carried out by Bucher Hydraulics.
4.5.4.2 Asymmetrical spools
The flow rates for asymmetrical spools may only be selected within the same flow range row in the flow rate table (A-side /
B-side) (Section 4.5.4.1).
The higher flow rate must be assigned to port A (e.g., 210/110, 230/130).
Combinations available upon request.
4.5.4.3 Example
Flow rate A-side / B-side: 200/200 l/min
1. Table (Section 4.5.3.1): Pressure compensator Y -> spool with flow rate QA/QB = 210/21 l/min
2. The setting to 200/200 l/min is made either via stroke limitation or via the electronics in the case of the actuation type
On-Board Electronics (OBE).
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4.6 Actuation Types
4.6.1 Actuation type - Electrohydraulic proportional + On-Board Electronics
4.6.1.1 Electro-Hydraulic Proportional
Type and symbol Description
SC18-…-…/…- 1_…/…- E _ _ _ _ N-X-XX-…/…- B-V…
D6
D7
***bar
***bar
A
B
a1
DUE7
DUE8
TA
TB
P
XL Y2
Y1
X2
Y3X3
TB1
TA1
2 spool positions
S proportional pressure reducing valve
S without position sensor
S without hydraulic actuation
S without manual override
S Actuation via port a
S damping orifice (on both sides)
S spool types: 1A, 1C, 1CB
SC18-…-…/…-_…/…- E _ _ _ _ N-X-XX-…/…- B-V…
D6
D7
***bar
***bar
A
B
DUE7
TA
TB
P
XL Y2
Y1
X2
Y3X3
TB1
TA1
DUE8
a1
b1
3 spool positions
S proportional pressure-reducing valves
S without position sensor
S without hydraulic actuation
S without manual override
S actuation via ports a and b
S damping orifice (on both sides)
S spool types: A, A, C, CB, D
SC18-…-…/…-_…/…- E _ _ _ _ A-X-XX-…/…- B-V 4
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
s
I
TA
TB
P
XL Y2
Y1
X2
Y3X3
TB1
TA1
3 spool positions
S proportional pressure-reducing valves
S With position sensor
S without hydraulic actuation
S without manual override
S actuation via ports a and b
S damping orifice (at both sides)
S spool types A, B, C, CB, D
Caution: No stroke limitation of the main spool
301-P-9050089-ENG-04/09.2025
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4.6.1.2 On-Board Electronics (OBE)
Type and symbol Description
SC18-…-…/…-_…/…- E36C0B-X-XX-…/…- B- W8
TA
TB
P
XL
Y2
Y1
X2
Y3
X3
D6
D7
***bar
***bar
A
B
DUE7
DUE8
6
s
TA1
TB1
3 spool positions
S digital interface with position sensor
S electronic pilot module EHA
S without hydraulic actuation
S without manual override
S actuation via ports a and b
S damping orifice (on both sides)
S spool types: A, B, C, CB, D
Caution: Maximum supply pressure for the
electrohydraulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot pressure supply
Note: Without stroke limiter for the main spool
Note: Circuit design by Bucher Hydraulics
4.6.1.3 Electrohydraulic Proportional,
with Pilot Pressure Test Points (A- and B-side)
Type and symbol Description
SC18-…-…/…-_…/…- E _ _ _ _ N-X-XX-…/…- B-V 14
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
a2
b2
TA
TB
P
XL
Y2
Y1
X2
Y3
X3
TA1
TB1
3 spool positions
S proportional pressure-reducing valves
S without position sensor
S without hydraulic actuation
S without manual override
S actuation via ports a and b
S test points for control pressure (A- and B-side)
S damping orifice (on both sides)
S spool types: A, B, CA, C, CB, D
Connection type F or G
S port a2 = G1/4“: plugged
S port b2 = G1/4“: plugged
Connection type U or V
S port a2 = 9/16-18UNF: plugged
S port b2 = 9/16-18UNF: plugged
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4.6.1.4 On-Board Electronics (OBE),
with Pressure Test Points (A- and B-sides)
Type and symbol Description
SC18-…-…/…-_…/…- E36C0B -X-XX-…/…- B- W10
D6
D7
***bar
***bar
A
B
DUE7
DUE8
6
s
b2
a2
TA
TB
P
XL
Y2
Y1
X2
Y3
X3
TA1
TB1
3 spool positions
S digital interface with position sensor
S electronic pilot module EHA
S without hydraulic actuation
S without manual override
S actuation via ports a and b
S test points for control pressure (A- and B-side)
S damping orifice (on both sides)
S spool types: A, B, C, CB, D
Connection type F or G
S port a2 = G1/4“: plugged
S port b2 = G1/4“: plugged
Connection type U or V
S port a2 = 9/16-18UNF: plugged
S port b2 = 9/16-18UNF: plugged
CAUTION: Maximum supply pressure for the
electrohydraulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
CAUTION: No stroke limitation of the main spool
CAUTION: Confi
uration b
Bucher H
draulics
4.6.1.5 Electrohydraulic Proportional with Hydraulic Actuation
Type and symbol Description
SC18-…-…/…-_…/…- E _ _ _ _N-Y-XX-…/…- B-V 13
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
a2
WV3
WV4
b2
a2
TA
TB
P
XL Y2
Y1
X2
Y3X3TA1
TB1
3 spool positions
b3
S proportional pressure-reducing valves
S without position sensor
S with hydraulic actuation
S without manual override
S actuation via ports a and b
S damping orifice (on both sides)
S spool types: A, B, C, CB, D
Connection type F or G
S port b3 = G1/8“: plugged
Connection type U or V
S port b3 = 3/8-24UNF:plugged
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.1.6 On-Board Electronic (OBE) and Hydraulic Actuation
Type and symbol Description
SC18-…-…/…-_…/…- E36C0B-D-XX-…/…- B- W8
D6
D7
***bar
***bar
A
B
DUE7
DUE8
6
s
WV4
b2
a2
WV3
TA
TB
P
XL Y2
Y1
X2
Y3X3TA1
TB1
3 spool positions
S digital interface with position sensor
S electronic pilot module EHA
S hydraulic actuation
S without manual override
S Actuation via ports a and b
S damping orifice (on both sides)
S spool types: A, B, C, CB, D
CAUTION: Maximum supply pressure for the
electrohydraulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
CAUTION: Without stroke limiter for the main spool
CAUTION: Configuration by Bucher Hydraulics
4.6.1.7 Electrohydraulic Proportional with Manual Lever
Type and symbol Description
SC18-…-…/…-_…/…- E _ _ _ _ N-X- _ _-…/…- B- V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA
TB
P
XL Y2
Y1
X2
Y3X3TA1
TB1
3 spool positions
S proportional pressure-reducing valves
S without position sensor
S without hydraulic actuation
S with manual actuation
S follow-up manual lever:
Manual operation can override the electrohydraulic
control.
The hand lever is directly connected to the main
spool and follows its movement during electrohy
draulic actuation.
S all lever positions are possible
S actuation via ports at a and b
S damping orifice (on both sides)
S spool types: A, B, C, CB, D
Manual operation (standard)
SC18-…-…/…-…/…-…-…- H_- …/… - B - V…
Emergency manual operation (short lever)
SC18-…-…/…-…/…-…-…- N_- …/… - B - V…
301-P-9050089-ENG-04/09.2025
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4.6.1.8 On-Board Electronics (OBE) and Manual Lever
Type and symbol Description
SC18-…-…/…-_…/…- E36C0B-X-_ _-…/…- B- W13
D6
D7
***bar
***bar
A
B
DUE7
DUE8
6
s
TA
TB
P
XL
Y2
Y1
X2
Y3X3TA1
TB1
3 spool positions
S digital interface with position sensor
S electronic pilot module EHA
S without hydraulic actuation
S manual actuation via follow-up hand lever:
Manual operation can override the electrohydraulic
control. The hand lever is directly linked to the main
spool. The hand lever follows spool movement dur
ing electrohydraulic control.
S all lever positions are possible
S actuation via ports a and b
S damping orifice (on both sides)
S spool types: A, B, C, CB, D
Caution: Maximum supply pressure for the
electrohydraulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
Note: Configuration by Bucher Hydraulics
Manual operation (standard)
SC18-…-…/…-…/…-…-…- H_- …/… - B - V…
Emergency manual operation (short lever)
SC18-…-…/…-…/…-…-…- N_- …/… - B - V…
4.6.1.9 Location of the Proportional Pressure Reducing Valves
Type and symbol Description
SC18-…-…/…-…/…-…- E…-…-…/…- B-V…
S installation position: vertical
S 2 covers, each with 1 proportional pressure-reducing
valve
301-P-9050089-ENG-04/09.2025
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4.6.2 Actuation Type - Electro-Hydraulic on/off
4.6.2.1 Electro-Hydraulic on/off, without Damping Orifice
Type and symbol Description
SC18-…-…/…-1_…/…- E _ _ _ _ N-X-XX-…/…- B- V 2
D6
D7
***bar
***bar
A
B
a1
TA
TB
P
XL
Y2
Y1
X2
Y3X3TA1
TB1
2 spool positions
S on/off valve
S without position sensor
S without hydraulic actuation
S without manual actuation
S actuation via port a
S without damping orifice
S spool types: 1A, 1C, 1CB
Caution: Maximum supply pressure for the electro-hy
draulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
SC18-…-…/…-_…/…- E _ _ _ _ N-X-XX-…/…- B- V 2
TA
TB
P
XL
Y2
Y1
X2
Y3X3TA1
TB1
3 spool positions
D6
D7
***bar
***bar
A
B
b1
a1
S on/off valves
S without position sensor
S without hydraulic actuation
S without manual actuation
S actuation via port a and b
S without damping orifice
S spool types: A, B, C, CB, D
Caution: Maximum supply pressure for the electro-hy
draulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.2.2 Electro-hydraulic on/off, with Bidirectional Damping Orifices
Type and symbol Description
SC18-…-…/…-1_…/…- E _ _ _ _ N-X-XX -…/…- B- V 0
D6
D7
***bar
***bar
A
B
a1
DUE7
DUE8
TA
TB
P
XL
Y2
Y1
X2
Y3X3TA1
TB1
2 positions
S on/off valve
S without position sensor
S without hydraulic actuation
S without manual actuation
S actuation via port a
S damping orifice (on both sides)
S spool types: 1A, 1C, 1CB
Caution: Maximum supply pressure for the electro-hy
draulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
SC18-…-…/…- _…/…- E _ _ _ _ N - X - XX -…/…- B - V 0
TB
TA P
XL Y2
Y1
X2
Y3X3
3 spool positions
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
S on/off valves
S without position sensor
S without hydraulic actuation
S without manual actuation
S actuation via ports a and b
S damping orifice (on both sides)
S spool types: A, B, C, CB, D
Caution: Maximum supply pressure for the electro-hy
draulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.2.3 Electro-Hydraulic on/off, without Damping Orifices,
with Test Points for the Pilot Pressure (A- and B-side)
Type and symbol Description
SC18-…-…/…- _…/…- E _ _ _ _ N - X - XX -…/…- B - W14
TA
TB
P
XL
Y2
Y1
X2
Y3X3
TA1
TB1
3 spool positions
D6
D7
***bar
***bar
A
B
b1
a1
a2
b2
S on/off valves
S without position sensor
S without hydraulic actuation
S without manual actuation
S actuation via ports a and b
S test points for the pilot pressure (A- and B-side)
S without damping orifice
S spool types: A, B, C, CB, D
Connection type F or G
S port a2 = G1/4“: plugged
S port b2 = G1/4“: plugged
Connection type U or V
S port a2 = 9/16-18UNF: plugged
S port b2 = 9/16-18UNF: plugged
Caution: Maximum supply pressure for the electro-hy
draulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
4.6.2.4 Electro-Hydraulic on/off and Hydraulic Actuation
Type and symbol Description
SC18-…-…/…- _…/…- E _ _ _ _ N - Y - XX -…/…- B - V 2
3 spool positions
TA
TB
P
XL
Y2
Y1
X2
Y3X3TA1
TB1
D6
D7
***bar
***bar
A
B
b1
a1
a2
WV3
WV4
b2
a2
S On/off valves
S without position sensor
S hydraulic actuation
S without manual override
S actuation via ports a and b
S without damping orifice
S spool types: A, B, C, CB, D
Caution: Maximum supply pressure for the electro-hy
draulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure conditioning
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.2.5 Electro-Hydraulic on/off and Manual Lever Operation
Type and symbol Description
SC18-…-…/…- _…/…- E _ _ _ _ N - X -_ _-…/…- B - V 2
3 spool positions
TA
TB
P
XL
Y2
Y1
X2
Y3X3TA1
TB1
D6
D7
***bar
***bar
A
B
b1
a1
S on/off valves
S without position sensor
S without hydraulic actuation
S with manual actuation
S follower-type hand lever:
The mechanical operator can override the electro
hydraulic operation. The hand lever is directly
connected to the main spool and follows its move
ment during electrohydraulic operation.
S all lever positions are possible
S actuation via ports a and b
S without damping orifice
S spool types: A, B, C, CB, D
Caution: Maximum supply pressure for the electro-hy
draulic pilot control: 50 bar.
Only in combination with
S inlet module with external pilot-oil supply
or
S inlet module with pilot-pressure supply
Manual operation (standard)
SC18-…-…/…-…/…-…-…- H_- …/… - B - V…
Emergency manual operation (short lever)
SC18-…-…/…-…/…-…-…- N_- …/… - B - V…
4.6.2.6 Installation Position of the Valves
Type and symbol Description
SC18-…-…/…-…/…-…- E… -…-…-…/…- B - V…
S mounting position: vertical
S 2 cover with 1 on/off valve
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.3 Actuation Type - Hydraulic
4.6.3.1 Hydraulic, without Damping Orifices
Type and symbol Description
SC18-…-…/…- 1_…/…- X00X0N -_- XX -…/…- B - V 2
TA
TB
P
XL Y2
Y1
X2
Y3X3
D6
D7
***bar
***bar
A
B
TA1
TB1
a2
3 spool positions
S Hydraulic actuation of the main spool. In the non-ac
tuated state, the spool is centered to the neutral posi
tion by return springs.
S without electrical actuation
S without manual actuation
S acuation port via a
S without damping orifices
S spool types: 1A, 1C, 1CB
Vertical connection (standard)
SC18-…-…/…-…/…-…- Y -…- …/… - B - V 2
Horizontal connection
SC18-…-…/…-…/…-…- Z -…- …/… - B - V 2
SC18-…-…/…- _…/…- X00X0N -_- XX -…/…- B - V 2
D6
D7
***bar
***bar
A
B
a2
b2
TA
TB
P
XL Y2
Y1
X2
Y3X3
TA1
TB1
3 spool positions
S Hydraulic actuation of the main spool. In the non-ac
tuated state, the spool is centered to the neutral posi
tion by return springs.
S without electrical actuation
S without manual actuation
S Actuation ports via a and b
S without damping orifices
S spool types: A, B, C, CB, D
Vertical connection (standard)
SC18-…-…/…-…/…-…-…- Y -…- …/… - B - V 2
Horizontal connection
SC18-…-…/…-…/…-…-…- Z -…- …/… - B - V 2
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.3.2 Hydraulic Actuation with Bidirectional Damping Orifices
Type and symbol Description
SC18-.-…/…- 1_…/…- X00X0N -_- XX -…/…- B - V 0
D6
D7
***bar
***bar
A
B
a2
DUE7
DUE8
DUE7
TA
TB
P
XL Y2
Y1
X2
Y3X3
TA1
TB1
3 spool positions
S Hydraulic actuation of the main spool. In the non-ac
tuated state, the spool is centered to the neutral posi
tion by return springs.
S without electrical actuation
S without manual actuation
S actuation via port a
S damping orifice (on both sides)
S spool types: 1A, 1C, 1CB
Vertical connection (standard)
SC18-…-…/…-…/…-…- Y -…- … / … - B - V 0
Horizontal connection
SC18-…-…/…-…/…-…- Z -…- … /… - B - V 0
SC18-.-…/…- _…/…- X00X0N -_- XX -…/…- B - V 0
D6
D7
***bar
***bar
A
B
a2
b2
DUE7
DUE8
TA
TB
P
XL Y2
Y1
X2
Y3X3
TA1
TB1
3 spool positions
S Hydraulic actuation of the main spool. In the non-ac
tuated state, the spool is centered to the neutral posi
tion by return springs.
S without electrical operation
S without manual operation
S control at a and b
S damping orifice (at both sides)
S spool types A, B, C, CB, D
Vertical connection (standard)
SC18-…-…/…-…/…-…- Y -…- … / … - B - V 0
Horizontal connection
SC18-…-…/…-…/…-…- Z -…- … / … - B - V 0
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.3.3 Hydraulic Actuation with Manual Lever
Type and symbol Description
SC18-…-…/…- _…/…- X00X0N-Y - _ _-…/…- B - V 0
3 spool positions
D6
D7
***bar
***bar
A
B
a2
b2
TA
TB
P
XL Y2
Y1
X2
Y3
X3
TA1
TB1
DUE8
DUE7
S Hydraulic actuation of the main spool (duo head: 1 co
ver with 2 ports). When not actuated, centering to neu
tral position by return springs.
S without electrical actuation
S with manual actuation
S follow-up hand lever:
The manual actuation can override the hydraulic
actuation. Thelever is directly connected to the
main spool and follows the spool movement during
hydraulic actuation.
S all lever positions are possible
S actuation via ports a and b
S without damping orifice
S spool types: A, B, C, CB, D
Manual operation (standard)
SC18-…-…/…-…/…-…-…- H_- … / … - B - V0
Emergency manual operation (lever length: short)
SC18-…-…/…-…/…-…-…- N_- … / … - B - V0
4.6.3.4 Port Orientation
Type and symbol Description
SC18-…-…/…-…/…-…- Y -…-…/…- B - V…
S hydraulic actuation
S 2 cover with 1 vertical port
SC18-…-…/…-…/…-…- Z -…-…/…- B - V…
S hydraulic actuation
S 2 covers with 1 horizontal port
301-P-9050089-ENG-04/09.2025
Series SC 18
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4.6.4 Manual Actuation
Type and symbol Description
SC18-…-…/…-_…/…- X00X0N - X - _ _ -…/…- B - V…
TA
TB
P
XL
Y2
Y1
X2
Y3X3
D6
D7
***bar
***bar
A
B
TA1
TB1
3 spool positions
S Manual actuation of the main spool. When not actu
ated, the spool is returned to the neutral position by
centering springs.
S without electrical actuation
S without hydraulic actuation
S all lever positions are possible
S actuation via ports a and b
S spool types: A, B, C, CB, D
Manual actuation (standard)
SC18-…-…/…-…/…-…-…- H_- … / … - B - V…
Emergency manual override (lever lenght: short)
SC18-…-…/…-…/…-…-…- N_- … / … - B - V…
4.6.5 Lever
4.6.5.1 Lever Position
Type and symbol Description
SC18-…-…/…-…/…-…-…- _A -…/…- B - V…
S manual actuation
S lever position A
S cranked hand lever
Manual actuation (standard)
SC18-…-…/…-…/…-…-…- HA -…/…- B - V…
Emergency manual override (short lever)
SC18-…-…/…-…/…-…-…- NA -…/…- B - V…
SC18-…-…/…-…/…-…- _L -…/…- B - V…
S manual actuation
S lever position L
S straight hand lever
Manual actuation (standard)
SC18-…-…/…-…/…-…-…- HL -…/…- B - V…
SC18-…-…/…-…/…-…-…- _X -…/…- B - V…
S manual actuation
S lever position X
S cranked hand lever
Manual actuation(standard)
SC18-…-…/…-…/…-…-…- HX -…/…- B - V…
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4.6.5.2 Lever Position
Lever position: A Lever position: L
L2
50
66
90
ca. 121
L1
15
75
51
25
50
19.5
28
50.5
ca. 57
P-B
P-A
23°
23°
Main spool axis
50
25
19.5
28
ca. 57
50
66
90
ca. 121
ca. 212
75
15
51
ca. 185
50.5
P-B
P-A
23°
23°
Lever position: X
50
66
ca. 121
15
51
75
25
50
28
19.5
50.5
90
P-B
P-A
23°
23°
4.6.5.3 Total Lenght
Ordering code
Cover height
L1 L2
SC18-…- HA -… ca. 260
SC18-…- NA -… ca. 160
4.6.5.4 Operating Force on Manual Lever
Type and symbol Description
Main spool axis
F
Operator:
E30A0_-X-H_, E31A0_-X-H_, E32A1_-X-H_, E33A1_-X-H_,
E34D0_-X-H_, E35D0_-X-H_, E36C0B-X-H_, E38A0X-X-H_,
E39A1X-X-H_, E40A0X-X-H_, E41A1X-X-H_, E42D0X-X-H_,
E43D0X-X-H_, X0000X-X-H_
Maximum force: 59 N
Operator:
E30A0_-X-N_, E31A0_-X-N_, E32A1_-X-N_, E33A1_-X-N_,
E34D0_-X-N_, E35D0_-X-N_, E36C0B-X-N_, E38A0X-X-N_,
E39A1X-X-N_, E40A0X-X-N_, E41A1X-X-N_, E42D0X-X-N_,
E43D0X-X-N_
Maximum force: 139 N
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4.7 Secondary Valves
4.7.1 Without Secondary Valves
Type and symbol Description
SC18-…-…/…-…/…-…-…-…- X000 / X000 - B - V…
TA
TB
P
XL Y2
Y1
X2
Y3X3
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
TA1
TB1
S without secondary valves in ports A and B
Note:
Secondary valves cannot be retrofitted.
4.7.2 Sealing Plug
Type and symbol Description
SC18-…-…/…-…/…-…-…-…- S000 / S000 - B - V…
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
DA
DB
TA
TB
P
XL Y2
Y1
X2
Y3
X3TA1
TB1
S sealing plug forsecondary valve
(connection interrupted) at port A
S sealing plug for secondary valve
(connection interrupted) at port B
Secondary valves can be retrofitted.
4.7.3 Line Connection
Type and symbol Description
SC18-…-…/…-…/…-…-…-…- M000 / M000 - B - V…
TA
TB
P
XL Y2
Y1
X2
Y3
X3TA1
TB1
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
DA
DB
S additional line connection for port A
S additional line connection for port B
Connection type F or G
S port DA = G1/4“: plugged
S port DB = G1/4“: plugged
Connection type U or V
S port DA = 9/16-18UNF: plugged
S port DB = 9/16-18UNF: plugged
Secondary valves can be retrofitted.
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4.7.4 Secondary Valves
Type and symbol Description
SC18- … -…/…-…/…-…-…-…- D*** / D***- B- V…
TA
TB
P
XL Y2
Y1
X2
Y3
X3TA1
TB1
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
DA
DB
***bar
***bar
S pressure relief valve for actuator port A
S pressure setting in bar for port A (3-digit)
S pressure relief valve at actuator port B
S pressure setting in bar for port B (3-digit)
The secondary valve (side A or B) is used to limit the
pressure from the actuator port to tank. It protects the
actuator circuit by restricting secondary-side pressure
to a predefined value.
SC18- … -…/…-…/…-…-…-…- K*** / K***- B- V…
TA
TB
P
XL Y2
Y1
X2
Y3
X3TA1
TB1
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
DA
DB
***bar
***bar
S shock valve with make-up function for actuator port A
S pressure setting in bar for port A (3-digit)
S shock valve with make-up function for actuator port B
S pressure setting in bar for port B (3-digit)
The secondary valve (on the A-side or B-side) is used
to protect the actuator circuit by diverting excess pres
sure to tank.
The valve protects the actuator on the secondary side
against unacceptably high pressure peaks.
The make-up function prevents cavitation in the actua
tor circuit.
Note:
The shock valve with make-up function is only suitable
for reducing pressure peaks.
It is not intended for use as a pressure relief valve.
SC18- … -…/…-…/…-…-…-…- N000 / N000- B- V…
TA
TB
P
XL Y2
Y1
X2
Y3
X3TA1
TB1
D6
D7
***bar
***bar
A
B
b1
a1
DUE7
DUE8
DA
DB
S make-up valve for actuator port A
S make-up valve for actuator port B
S characteristic curve: see Chapter 8
The secondary valve on the A-side or B-side prevents
cavitation in the actuator circuit.
IMPORTANT!
The pressure setting for the shock valve must be at least 30 bar higher than the load-sensing pressure cut-off value.
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4.8 Ordering code
4.8.1 Ordering Code for Actuator Module, Part 1
SC Valve series
18 Nominal size
Pressure compensator
R load-holding valve function
T without pressure compensator
Y pressure compensator without load-holding function
Z pressure compensator with load-holding function
3 Actuator section number
(max. 8; > 8 on request)
Port connection type
F threaded port (ISO 1179-Part 1 Whitworth-thread)
flange (ISO 6162 SAE-flange); mounting: metric
G threaded port (ISO 1179-Part 1 Whitworth-thread)
without flange
U thraded port (ISO 11926-Part 1 UNF-thread)
without flange
V threaded port (ISO 11926-Part 1 UNF-thread)
flange (ISO 6162 SAE flange); mounting: UNC
Open ports / spacer plate
port A: open, port B: open
0 actuator module without spacer plate
1 actuator module with spacer plate (10 mm wide)
Port A: plugged, Anschluss B: open
2 actuator module without spacer plate
4 actuator module with spacer plate (10 mm wide)
Load sensing A (D6)
A bolt-on plate
D primary pressure cut-off D6 (manual setting)
M line connection
S sealing plug – primary-pressure cut-off, (connection interrupted)
T vent plug – primary-pressure cut-off, (connection open)
Primary pressure cut-off A -side [bar]
000 without (only in combination with load sensing A (…-V65), M, S or T)
330 specify the required setting (e.g. 330 bar)
Load sensing B (D7)
A bolt-on plate
D primary pressure cut-off D7 (manual setting)
M line connection
S sealing plug – primary-pressure cut-off, (connection interrupted)
Primary pressure cut-off B-side [bar]
000 without (only in combination with load sensing A (…-V65), M or S
330 specify the required setting
C Spool type (specify required spool type,e.g. C)
200 Flow rate A-side (specify required flow rate, e.g. 200 l/min)
160 Volumenstrom B-Seite (gewünschten Volumenstrom angeben z.B. 160 l/min)
SC 18 - Y 3 G 3 - D 330 / S 000 - C 200 / 160 -
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4.8.2 Ordering Code for Actuator Module, Part 2
Spool configuration
data specified by Bucher Hydraulics
Electrical actuation
(selection menu - refer to Chapter 8)
E31A0N electrical actuation (example E31A0N)
X00X0N no electrical actuation
Hydraulic actuation
D dual-head (only for electric actuation E36C0B)
X no hydraulic actuation
Y vertical port connection (standard)
Z horizontal port connection
Manual actuation
H manual actuation (standard)
N emergency manual actuation (short lever)
X no manual actuation
Hand lever position
A lever position A
L lever position L (only with manual operation H)
Z lever position Z (only with manual operation H)
X no manual actuation
Secondary valve, A-side (DA)
D pressure relief valve
K Shock valve with suction
M2
nd
line connection
N suction valve
S plug (disconnected)
X not retrofittable
Secondary pressure setting, A-side
000 None (only valid with secondary valve M, N, S or X)
200 Desired setting,e.g. 200 bar
Secondary valve, B-side (DB)
D pressure relief valve
K Shock valve with suction
M2
nd
line connection
N suction valve
S plug (disconnected)
X not retrofittable
Secondary pressure setting, B-side
000 None (only valid with secondary valve M, N, S or X)
200 Desired setting,e.g. 200 bar
Series Version
(Factory-defined by Bucher Hydraulics)
Option
… possible options see Chapter 4.8.4
A00 E31A0N Z - H L - D 150 / K 200 - B - V0
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4.8.3 Electrical Actuation
4.8.3.1 Electrohydraulic Proportional Actuation, without Position Sensor
Manual Override Connector type (solenoid) Supply voltage 12 V Supply voltage 24 V
without
DT04-2P E34D0N E35D0N
AMP Junior Timer 2-pin E30A0N E31A0N
with
DT04-2P E50D1N E49D1N
AMP Junior Timer 2-pin E32A1N E33A1N
4.8.3.2 Electrohydraulic Proportional Actuation, with Position Sensor
Position sensor Solenoid
Connector type Supply voltage Manual override connector type Supply voltage 12 V Supply voltage 24 V
AMP
Superseal 1,5
4-pole CA
male
9 … 32 VDC
without
DT04-2P E34D0A E35D0A
AMP Junior Timer
2-pin
E30A0A E31A0A
with
DT04-2P E50D1A E49D1A
AMP Junior Timer
2-pin
E32A1A E33A1A
4.8.3.3 Onboard Electronics (OBE), Electrohydraulic Actuator (EHA) with Position Sensor
Manual ooverride Connector type (solenoid) Supply voltage 12 V Supply voltage 24 V
without DT14-6P E36C0B
4.8.3.4 Electrohydraulic On-Off, Without Displacement Sensor
Manual override Connector type (solenoid) Supply voltage 12 V Supply voltage 24 V
without
DT04-2P E42D0N E43D0N
AMP Junior Timer 2-pin E38A0N E40A0N
with AMP Junior Timer 2-pin E39A1N E41A1N
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4.8.4 Options
V0 Damping orifice in actuation (both sides)
V2 Without damping orifice in actuation
V4 Damping orifice in actuation (both sides), without main spool stroke limitation
V13 Damping orifice in actuation (both sides), control pressure test point: port b3 plugged
V14 Damping orifice in actuation (both sides), control pressure test point: ports a2 and b2 plugged
V49 Damping orifice in the operator (both sides), separate load-sensing tapping: port XLA: plugged, port XLB: plugged,
cover with pressure rellief valve: D6, D7
V59 Damping orifice in actuation (both sides), electro-proportional pressure limiting with rising characteristic,
cover with pressure relief valves: D6, D7
V61 Damping orifice in actuation (both sides), switchable secondary pressure cut-off (load-sensing),
cover with pressure relief valves: D6, D7
V65 Damping orifice in actuation (both sides), electro-proportional pressure limiting with rising characteristic, cover without
pressure relief valves: D6, D7
V74 Damping orifice in actuation (both sides), without main spool stroke limitation, valve body without Y2 line,
separate load-sensing tapping: ports XLA and XLB plugged, cover with pressure relief valves: D6, D7
V92 The reduced pump pressure tapping is plugged
W8 Damping orifice in actuation (both sides), without main spool stroke limitation, valve body without Y2 line
W10 Damping orifice in actuation (both sides), without main spool stroke limitation, valve body without Y2 line,
control pressure test point: ports a2 and b2 plugged
W13 Damping orifice in actuation (both sides), valve body without Y2 line, stroke limitation (A-side) and stroke limitation
(B-side) both located on A-side
W14 Without damping orifice in actuation, control pressure test point: ports a2 and b2 plugged
Option Port
Connection type
G H U V
V13 b3 G1/8” 3/8-24UNF
V14 W10 W14 a2, b2
G1/4” 9/16-18UNF
V49 XLA, XLB
Combinations of different options (e.g. V14 and V59) are pos sible. When ordering, they are specified individually in the order
ing code and later replaced by a single option number by Bucher Hydraulics .
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4.9 Dimensions
4.9.1 Valve Housing Variants
4.9.1.1 Dimensions of Valve Housing Variants
Type and dimensions Type and dimensions
SC18-_ _ F0 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ F2 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ V0 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ V2 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ F1 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ F4 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ V1 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ V4 -…/…-…/…-…-…-…- …/… - B - V…
65
73
14
()85
H1
160
55
49
0
122
H2
50.8
23.8
D1
A
B
A-side
B-side
Main spool axis
= only for SC18-_ _ _ 2
A-side
B-side
73
14
()62
H2
65
H1
49
0
122
50.8
23.8
D1
160
10 55
()65
27.5
0
A
B
= only for SC18- _ _ _ 4
Main spool axis
SC18-_ _ G0 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ G2 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ U0 -…/…-…/…-…-…-…- …/… - B - V…
SC18-_ _ U2 -…/…-…/…-…-…-…- …/… - B - V…
49
0
122
55
73
14
ca. 176
ca. 179
65
85
160
A
B
A-side
B-side
= only for SC18- _ _ _ 2
Main spool axis
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4.9.1.2 Total Lenghts
Ordering code
Valve height
H1 H2
SC18- _ _ F _ -… 172 ca. 201
SC18- _ _ V _ -… 173 ca. 202
4.9.1.3 Connection Sizes
Ordering code Port ISO 1179-1 ISO 11926-1
Similar to
ISO 11926-2
(6000 PSI)
SC18- _ _ F _ -…
A, B Actuator DN19 (SAE 3/4)
SC18- _ _ V _ -…
SC18- _ _ G _ -… A, B Actuator G1“
SC18- _ _ U _ -… A, B Actuator 1 5/16-12UN
4.9.1.4 Mounting threads
Ordering code
Flange
H1 L9
SC18- _ F _ -… M10 17
SC18- _ V _ -… 3/8-16UNC 21
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4.9.2 Primary Pressure Cut-Off
4.9.2.1 Dimensions - Primary Pressure Cut-Off, Part 1
Type and dimensions Type and dimensions
SC18-…- D*** / D***-…/…-…-…-…-…/…- B - V… SC18-…- M000 / M000-…/…-…-…-…-…/…- B - V…
A-side
B-side
()87
ca. 43
A
B
Main spool axis
11.515
45
28
()87
ca. 20
A
B
A-side
B-side
Main spool axis
SC18-…- S000 / S000-…/…-…-…-…-…/…- B - V… SC18-…- T000 / D***-…/…-…-…-…-…/…- B - V…
A-side
B-side
()87
ca. 4
A
B
Main spool axis
A-side
B-side
()87
ca. 43
AB
Main spool axis
4.9.2.2 Connection Sizes, Part 1
Ordering code Port ISO 1179-1 ISO 11926-1
SC18- … -M000 / M000-… M Test point G1/4“ 9/16-18UNF
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4.9.2.3 Dimensions - Primary Pressure Cut-Off, Part 2
Type and dimensions Type and dimensions
SC18-…- A*** / A***-…/…-…-…-…-…/…- B- V 49 SC18-…- A*** / A***-…/…-…-…-…-…/…- B- V 59
A-side
B-side
1212
45.5
31
53
26.5
()87
53
ca. 58
74
ca. 117
68
AB
D6
D7
Main spool axis
26.5
53
68
()8775
80
74ca. 107
ca. 219
B
D6
D7
V1
A-side
B-side
Main spool axis
A
SC18-…- A***/A***-…/…-…-…-…-…/…- B- V 61-D8=*** SC18-…- A000 / A000-…/…-…-…-…-…/…- B- V 65
A-side
B-side
()8790
95
ca. 106
74
68
70.5
ca. 183
26.5
53
V1
D8
D6
D7
AB
Main spool axis
A-side
B-side
53
26.5
()87
43
48
ca. 69
78
64
ca. 171
AB
Main spool axis
4.9.2.4 Connection Sizes, Part 2
Ordering code Port ISO 1179-1 ISO 11926-1
SC18- … -V 49 XLA, XLB Load sensing G1/4“ 9/16-18UNF
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4.9.3 Actuation Types
4.9.3.1 Dimensions - Actuation Type, Part 1
Type and dimensions Type and dimensions
SC18-…-…/…- 1_…/…- E_ _ _ _ N - X - XX -…/…- B - V 0
SC18-…-…/…- 1_…/…- E_ _ _ _ N - X - XX -…/…- B - V 2
SC18-…-…/…- _…/…- E_ _ _ _ N - X - XX -…/…- B - V 0
SC18-…-…/…- _…/…- E_ _ _ _ N - X - XX -…/…- B - V 2
25
50
25
50
50
ca. 81()160
50
ca. 81
ca. 322
75
79.5
75
20
20
H3
AB
A-side
B-side
2 spool positions
Main spool axis
50
25
25
50
()160
50
ca. 81ca. 81
50
75
20
H3
75
20
H3
ca. 322
A
A-side
B-side
B
Main spool axis
3 spool positions
Type and dimensions Type and dimensions
SC18-…-…/…- _…/…- E_ _ _ _ N - X - XX -…/…- B - V 14
SC18-…-…/…- _…/…- E_ _ _ _ N - X - XX -…/…- B - W 14
SC18-…-…/…- _…/…- E_ _ _ _ N - Z - XX -…/…- B - V 13
A-side
B-side
25
50
12
8
50
25
()160
50
ca. 81
ca. 322
50
ca. 81
20
75
43
H3
20
75
H3
43
AB
a2 b2
b2
a2
3 spool positions
Main spool axis
25
50
12
50
25
10
11
ca. 51
50
ca. 81
()160
ca. 322
ca. 81
50
20
75
H3
62
75
20
H3
43
61
a2
b2
b3
AB
a2
b2
b3
A-side
B-side
3 spool positions
Main spool axis
4.9.3.2 Total Lengths, Part 1
Ordering code Valve height
Electrical operation H3
E30… E31… E32… E33… ca. 137
E34… E35… E49… E50… ca. 145
E38… E39… E40… E41… ca. 131
E42… E43… ca. 139
4.9.3.3 Connection Sizes, Part 1
Ordering code Port ISO 1179-1 ISO 11926-1
SC18- … -V13
a2, b2 Load sensing G1/4“ 9/16-18UNF
b3 Test point G1/8“ 3/8-24UNF
SC18- … -V14
a2, b2 Load sensing G1/4“ 9/16-18UNF
SC18- … -W14
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4.9.3.4 Dimensions - Actuation Types, Part 2
Type and dimensions Type and dimensions
SC18-…-…/…- _…/…- E_ _ _ _ N-X-H_-…/…- B-V 0
SC18-…-…/…- _…/…- E_ _ _ _ N-X-H_-…/…- B-V 2
SC18-…-…/…- _…/…- E_ _ _ _ N-X-N_-…/…- B-V 0
SC18-…-…/…- _…/…- E_ _ _ _ N-X-N_-…/…- B-V 2
SC18-…-…/…-_…/…- E_ _ _ _ A-X-XX -…/…- B-V 4
50
25
50
25
ca. 51
19.5
20
75
H3
66
50
ca. 121
50
ca. 81()160
ca. 362
75
24
15
A
B
A-side B-side
Main spool axis
3 spool positions
A-side
B-side
3 spool positions
25
50
50
25
50
56
20
75
H3
()160
64
ca. 142
21
20
75
H3
ca. 358
AB
Hauptschieberachse
Type and dimensions Type and dimensions
SC18-…-…/…-_…/…- E36C0B-X-XX-…/…- B- W8 SC18-…-…/…-_…/…- E36C0B-X-XX-…/…- B- W10
26
52
25
50
38
20
55
50
56 ()160
60
24
120
65.9
57
ca. 143
ca. 357
AB
A-side
B-side
3 spool positions
Main spool axis
A-side
B-side
26
52
25
50
10.510.5
16.4
39.9
50
56
20
55
()160
57
24
120
65.9
60
ca. 143
ca. 357
A
B
Main spool axis
3 spool positions
4.9.3.5 Total Lengths, Part 2
Ordering code Valve length
Electric actuation H3
E30… E31… E32… E33… ca. 137
E34… E35… E49… E50… ca. 145
E38… E39… E40… E41… ca. 131
E42… E43… ca. 139
4.9.3.6 Connection Sizes, Part 2
Ordering code Port ISO 1179-1 ISO 11926-1
SC18- … - W10 a2, b2 Load sensing G1/4“ 9/16-18UNF
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4.9.3.7 Dimensions - Actuation Types, Part 3
Type and dimensions Type and dimensions
SC18-…-…/…- _…/…- E36C0B-D-XX-…/…- B- W8 SC18-…-…/…- _…/…- E36C0B-X-H_-…/…- B- W13
SC18-…-…/…- _…/…- E36C0B-X-N_-…/…- B- W13
16.4
45.9
54
27
11
4
20
55
50
56
ca. 357
()160
57
24
60
140
ca. 143
65.9
52
26
AB
A-side
B-side
3 spool positions
Main spool axis
25
50
50
25
38
24
57
65.9
60
120
ca. 143
19.5
ca. 51
()160
50
ca. 131
76
15
24
75
ca. 432
A
B
A-side
B-side
Main spool axis
3 spool positions
Type and dimensions Type and dimensions
SC18-…-…/…-1_…/…-X00X0N-Y-XX-…/…- B- V 0
SC18-…-…/…-1_…/…-X00X0N-Y-XX-…/…- B- V 2
SC18-…-…/…-1_…/…-X00X0N-Z-XX-…/…- B- V 0
SC18-…-…/…-1_…/…-X00X0N-Z-XX-…/…- B- V 2
3
25
50
25
50
25
20
75
20
75
79.5
50
ca. 81
ca. 322
ca. 81
50
()160
AB
A-side
B-side
Main spool axis
2 spool positions
13
25
50
25
50
50
ca. 81
ca. 322
ca. 81
50
20
75
50
20
75
79.5
()160
a2
A
B
a2
A-side
B-side
Main spool axis
2 spool positions
4.9.3.8 Connection Sizes, Part 3
Ordering code Port ISO 1179 -1 ISO 11926 -1
SC18- … - W8 a2, b2 Load sensing
G1/4“ 9/16-18UNFSC18- … - Y-…
a2 Load sensing
SC18- … - Z-…
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4.9.3.9 Dimensions Operation Types, Part 4
Type and dimensions Type and dimensions
SC18-…-…/…-_…/…-X00X0N-Y-XX-…/…- B-V 0
SC18-…-…/…-_…/…-X00X0N-Y-XX-…/…- B-V 2
SC18-…-…/…-_…/…-X00X0N-Z-XX-…/…- B-V 0
SC18-…-…/…-_…/…-X00X0N-Z-XX-…/…- B-V 2
3
25
50
25 25
25
50
50
ca. 81
50
ca. 81()160
ca. 322
20
75
20
75
A
B
A-side
B-side
3 spool positions
Main spool axis
13
25
50
25
50
13
()160
50
ca. 81
ca. 322
50
ca. 81
20
75
50
20
50
75
b2
a2
A
B
b2
a2
A-side
B-side
3 spool positions
Main spool axis
Type and dimensions Type and dimensions
SC18-…-…/…-_…/…-X00X0N-Y-H_-…/…- B-V 0
SC18-…-…/…-_…/…-X00X0N-Y-H_-…/…- B-V 2
SC18-…-…/…-_…/…-X00X0N-Y-N_-…/…- B-V 0
SC18-…-…/…-_…/…-X00X0N-Y-N_-…/…- B-V 2
SC18-…-…/…-_…/…-X00X0N-X-H_-…/…- B-V 2
SC18-…-…/…-_…/…-X00X0N-X-N_-…/…- B-V 2
25
50
2523
25
50
3
19.5
ca. 51
20
75
50
ca. 81
ca. 362
ca. 121
50
66
24
39
75
()160
A
B
A-side
B-side
Main spool axis
3 spool positions
25
50
25
50
19.5
ca. 51
50
ca. 81
ca. 362
20
75
79.5
()160
50
66
ca. 121
24
75
39
A
B
A-side
B-side
Main spool axis
3 spool positions
4.9.3.10 Connection Sizes, Part 4
Ordering code Port ISO 1179 -1 ISO 11926-1
SC18- … - Y-
a2, b2 Load sensing G1/4“ 9/16-18UNF
SC18- … - Z-…
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5 End module
5.1 End Module (no control function)
Type and symbol Description
SC18- EXX-00X-XX-XX- B- V 0
SC18- EYX-00X-XX-XX- B- V 0
End module (right)
TA1 TB P XL Y2 Y1X2 Y3X3TB1 TA
S no control function
Module type:
S E = end module (right)
S EA = end module (left)
Connection type:
S X = mounting thread: M10
5.2 End Module with additional P and T Ports
Type and symbol Description
SC18- EFX-11X-XX-XX- B- V 2
SC18- EGX-11X-XX-XX- B- V 2
SC18- EUX-11X-XX-XX- B- V 2
SC18- EVX-11X-XX-XX- B- V 2
End module (right)
PETE
TA1 TB P XL Y2 Y1X2 Y3X3TB1 TA
S tank bridge
Module type:
S E = end module (right)
Connection typ F( mounting: metric):
S PE = flange DN25 (SAE 1“) (6000PSI): open
S TE = flange DN32 (SAE 1 1/4“) (3000PSI): open
Connection type G:
S PE = G1 1/4“: open
S TE = G1 1/2“: open
Connection type U:
S PE = 1 5/8-12UN: open
S PE = 1 7/8-12UN: open
Connection type V (mounting: UNC):
S PE = flange DN25 (SAE 1“) (6000PSI): open
S TE = flange DN32 (SAE 1 1/4“) (3000PSI): open
5.3 End Module with additional XL1 Port
Type and symbol Description
SC18-EFGX-00X-XX-XX- B- V 0
SC18-EFUX-00X-XX-XX- B- V 0
End module (right)
XL1
TA1 TB P XL Y2 Y1X2 Y3X3TB1 TA
Module type:
S EF = end module (right)
Connection type G:
S XL1 = G1/4”: open
S XL1 = 9/16-18UNF: open
Connection type U:
S XL1 = 9/16-18UNF: open
Note:
The unloading of the load-sensing signal via port XL1
must be ensured externally.
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5.4 Ordering Code
SC Valve series
18 Nominal size
Module variant
E end module (right) port XL1 not available
EF end module (right), additional port XL1: open
Connection type
F thread (ISO 1179-Part 1 Whitworth pipe thread)
flange (ISO 6162 SAE-flange); mounting: metrisch
G thread (ISO 1179-Teil 1 Whitworth pipe thread)
without flange
U thread (ISO 11926-Teil 1 UNF-thread)
without flange
V thread (ISO 11926-Teil 1 UNF-thread)
flange (ISO 6162 SAE flange); mounting: UNC
X no ports
module mounting: M10
Y no ports
module mounting: 3/8-16UNC
Design Feature
defined by Bucher Hydraulics
Port P
0 not present
1 open
2 closed
Port T
0 not present
1 open
2 closed
Design Feature
defined by Bucher Hydraulics
Design Feature
defined by Bucher Hydraulics
Design Feature
defined by Bucher Hydraulics
Serie Version
defined by Bucher Hydraulics
Option
… possible options, see Chapter 5.4.1
SC 18 - E G X - 0 0 X - XX - XX - B - V0
5.4.1 Options
V0 no control function
V2 additional P and T port
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5.5 Dimensions
Type and dimensions Type and dimensions
SC18-EXX-00X-XX-XX- B- V 0
SC18-EYX-00X-XX-XX- B- V 0
SC18-EFGX-00X-XX-XX- B- V 0
SC18-EFUX-00X-XX-XX- B- V 0
20
0
90
10
0
D1
160
149
14
0
10
0
70
0
140
D1
20
20
14
0
D1
20
0
90
10
0
160
149
43
0
28.3
0
70
0
140
D1
10
0
Type and dimensions Type and dimensions
SC18-EGX-11X-XX-XX- B- V 2
SC18-EUX-11X-XX-XX- B- V 2
SC18-EFX-11X-XX-XX- B- V 2
SC18-EVX-11X-XX-XX- B- V 2
30
0
129.5
50
0
D1
40
0
80
40
0
102
160
164.5
149
64
14
0
54
0
70
0
140
D1
70
0
140
54
0
D1
14
0
64
160
164.5
60
0
103
149
40
0
118
D1
54
0
10
0
93
30.2
58.7
D3
27.8
57.2
D2
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5.5.1 Port Sizes
Ordering code Port ISO 1179-1 ISO 11926-1
Similar
ISO 6162-1
(3000 PSI)
Similar
ISO 11926-2
(6000 PSI)
SC18- EFX-…
SC18- EVX-…
PE Pump DN25 (SAE 1)
TE Tank DN32 (SAE 1 1/4)
SC18- EFGX-… XL1 Load sensing external actuator G 1/4“
SC18- EFUX-… XL1 Load sensing external actuator 9/16-18UNF
SC18- EGX-…
PE Pump G 1 1/4“
TE Tank G 1 1/2“
SC18- EUX-…
PE Pump 1 5/8-12UN
TE Tank 1 7/8-12UN
5.5.2 Mounting Thread
Ordering code
Module Flange
D1 Depth D2 Depth D3 Depth
SC18- EFX-… M10 17 M12 23 M10 22
SC18- EFGX-…
SC18- EGX-…
SC18- EXX-…
M10 17
SC18- EFUX-…
SC18- EUX-…
SC18- EYX-…
3/8-16UNC 16
SC18- EVX-… 3/8-16UNC 16 7/16-14UNC 27 7/16-14UNC 27
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6 Special Modules
6.1 Combination with L.8S Series
Description
Series L.8S:
Maximum actuator flow: 90 l/min
Maximum pump pressure: 315 bar
Maximum load pressure: 315 bar
Maximum tank pressure: 40 bar
Note:
The combination with the L.8S series is designed by
Bucher Hydraulics.
Directional valve serie L.8S see datasheet 100-P-000047.
6.2 Combination with SC12 series
Description
Series SC12:
Maximum actuator flow: 130 l/min
Maximum pump pressure: 370 bar
Maximum load pressure: 420 bar
Maximum tank pressure: 50 bar
Note:
The combination with the SC12 series is designed by
Bucher Hydraulics.
Sandwich-mounted directional valve series SC12 see datasheet 301-P-9050091.
6.3 Combination with SC22 series
Description
Series SC22:
Maximum actuator flow: 340 l/min
Maximum pump pressure: 370 bar
Maximum load pressure: 420 bar
Maximum tank pressure: 50 bar
Note:
The combination with the SC22 series is designed by
Bucher Hydraulics.
Sandwich-mounted directional valve series SC22 see datasheet 301-P-9050084.
6.4 Combination with SVC25 series
Description
Series SVC25:
Maximum actuator flow: 500 l/min
Maximum pump pressure: 370 bar
Maximum load pressure: 420 bar
Maximum tank pressure: 50 bar
Note:
The combination with the SVC25 series is designed by
Bucher Hydraulics.
Sandwich-mounted directional valve series SVC25 see datasheet 301-P-9050085.
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7 Solenoid valves
7.1 Electro-Hydraulic On/Off Pilot Valves
General characteristics Unit Ordering code
(electrical operation)
E39… E40… E41…
E43…
Supply voltage V DC 12 24
Protection class to EN 60529 up to IP6K6 / IPX7 / IPX9K
Coil resistance at 20 °C Ω 8,15 ± 5% 32,5 ± 5%
Duty cycle 100%
Switching time
t
on
t
off
ms
ms
< 60
< 100
Electrical connection see ordering code
7.2 Electro-Hydraulic Pilot Valves, Proportional
General characteristics Unit Ordering code
(electrical operation)
E30… E32… E33…
E34… E50… E49…
Supply voltage V DC 12 24
Control current at opening point mA 700 350
Control current at max. stroke mA 1400 700
PWM frequency (recommended)
The PWM frequency should be optimised to suit the
application and operating conditions.
Hz 100
Protection class to EN 60529 IP 65
Insulation class to VDE 0580 H
Coil resistance at 20 °C Ω 5,3 ± 5% 21,2 ± 5%
Coil resistance at 60 °C Ω 6,1 ± 5% 24,5 ± 5%
Power consumption at maximum stroke
of the main valve spool (coil resistance at 60 °C)
VA 10,4
Relative duty cycle (ED)
Limit current at
mA 1500 750
Electrical connection see ordering code
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7.3 On-Board Electronics: Electro-Hydraulic Actuator (EHA)
6
s
General characteristics Unit Ordering code
(electrical operation)
E36…
Supply voltage V DC 24
Electrical connection DT14-6P
Electro-hydraulic actuator see datasheet 100-P-000230.
7.4 Directional valves
General characteristics Unit
Ordering code (option)
Inlet module Actuator module
SC18-…-…-…-11X-00- B- V2 SC18-…-A***/A***-…- B- V61
Symbol
Type 2/2 directional valve
(spool valve)
3/2 directional valve
(seat valve)
Manual override with without
Supply voltage 28 24
Protection class to EN 60529 IP65
Duty cycle % 100
Electrical connection AMP Junior-Timer 2-pole
2/2-way seated valve cartridge, size NG 5 (series WR22G_A5) see datasheet 400-P-121120.
3/2-way spool valve cartridge, size NG3 (series WKP32GNA3…) see datasheet 400-P-120821.
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7.5 Proportional Pressure Relief Valves
7.5.1 Pressure Relief Valve (rising characeristic curve)
General characteristics Unit Ordering code (option)
Actuator module
V59 V65
Supply voltage V DC 24
Control current mA 0 … 800
Power consumption at maximum control current W max. 17,5
PWM frequency (recommended) Hz 200
Protection class to EN 60529 IP 65
Coil resistance at 20 °C Ω 17,2
Duty cycle: % 100
Electrical connection AMP Junior-Timer 2-pole
For inverse proportional pressure relief cartridge NG2 ... 4 (series DBDTC-1L...), see data sheet 400-P-585111.
Note:
The proportional pressure relief valve is not suitable for relieving a load signal.
7.5.2 Pressure adjustment characteristic
DBDTC-1L
0
50
100
150
200
250
300
350
200
300
400 500 600
p [bar]
Current [mA]
100
700
800
0
7.6 Connector-Socket Type
AMP Junior Timer 2-pole DT04-2P DT14-6P
2-pin 2-pin 6-pin
Note:
Mating plugs are not included in the delivery.
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8 Secondary Valves (Technical Data)
8.1 Valve Type S: Sealing Plug
A/B
T
Type and Dimension Part number
SC18-…-…/…-…/…-…-…-…- S000 / …- B-V…
SC18-…-…/…-…/…-…-…-…-… / S000- B-V…
Ma = 60 ± 10% [Nm]
10
A/B
T
301RC011343
8.2 Valve type M: Line Connection
A/B
T
Type and Dimension Part number
SC18-…-…/…-…/…-…-…-…- M000 / …- B- V…
SC18-…-…/…-…/…-…-…-…-… / M000- B- V…
Ma = 60 ± 10% [Nm]
24
A/B
T
301RC015738
8.3 Valve Type N: Make-Up Check Valve
A/B
T
Type and Dimension Part number
SC18-…-…/…-…/…-…-…-…- N000 / …- B- V…
SC18-…-…/…-…/…-…-…-…-… / N000- B- V…
Ma = 70 - 80 [Nm]
24
A/B
T
301RC020019
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8.4 Valve type K:
Adjustable Shock Valve
with Make-Up Function
A/B
T
Type and Dimension Part number
SC18-…-…/…-…/…-…-…-…- K*** / …- B- V…
SC18-…-…/…-…/…-…-…-…-… / K***- B- V…
A/B
T
24
Ma=60-80 [Nm]
13
Ma=15-20 [Nm]
4
301RC015498
Caution:
Only suitable for reducing pressure peaks; not suitable as a pressure relief valve.
IMPORTANT:
The setting of the shock valve must be 30 bar higher than the setting of the load-sensing pressure relief unit.
8.5 Valve type D:
Pressure Relief Valve
A/B
T
Type and Dimension Part number
SC18-…-…/…-…/…-…-…-…- D*** / …- B- V…
SC18-…-…/…-…/…-…-…-…-… / D***- B- V…
5
17
Ma=20 [Nm]
24
Ma=90 [Nm]
A/B
T
400552596
8.6 Characteristic Curves
8.6.1 Anti-cavitation function
Q = actuator flow T -> A/B
Δp = tank pressure - actuator pressure
0
4
12
16
20
28
32
40
0 10203040506070
Q
T-A/B
[l/min]
80
Δp
T-A/B
[bar]
90
100
8
24
36
1
2
Graph Valve type
1 K
2 N
8.6.2 Anti-shock function
Q = actuator flow A/B -> T
Δp = actuator pressure - tank pressure
0
200
400
500
0 10203040506070
Q
A/B-T
[l/min]
80
Δp
AB-T
[bar]
90
100
100
300
1
4
3
2
120110
Graph Pressure range [bar]
1 380
2 280
3 160
4 80
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9 Sensors
9.1 Displacement Sensor
General characteristics Unit Ordering code
(electrical operation)
E_ _ _ _ A
Voltage type direct voltage
Supply voltage V 9 … 32
Output signal mA 4 … 20
Protection class IP 69 / IP6K9K
Load-cycles 10 mio. cycles
Electrical connection AMP Superseal 1,5 4P CA male
Cable lenght
(incl. plug)
222.5 12.5
9.2 Connector-Socket Type
AMP Superseal 1.5
4-pole
4-pin
CAUTION:
Mating connectors are not part of the delivery.
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10 Ordering Examples
10.1 Valve System without Bolt-On Plates
1
4
3
2
5
320 bar
D1
DUE1
X1TMPPXL X Y
G1
G2
D6
D7
A
A260/160
200 bar
80 bar
DUE8
b1
DUE7
a1
DB
B
230bar
D6
D7
A
C210/210
310 bar
60 bar
B
DUE7
DUE8
D6
D7
A
C260/260
a2
B
260bar260bar
b2
DA
s
DA
DB
230 bar
230 bar
6
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Pos. Description Ordering code
General
S valve series: SC
S nominal size: 18
1 Inlet module
S system pressure relief: 320 bar
S connection type: threaded (inch)
S no load-sensing pressure relief
S pilot oil supply / pilot oil drain: external
S no pilot-pressure conditioning
S no pilot-pressure cut-off
S no pressure peak reduction
SC18-MG320-110-0000-
00X-00-B-V0T1
2 1st actuator module
S pressure compensator without load-holding function
S actuator section number: 1
S connection type: threaded G1”, port A and B: open
S without spacer plate
S primary pressure cut-off: D6 = 200 bar, D7 = 80 bar
S spool with 3 positions, spool type A
S flow rate for actuator A: 260 l/min, actuator B: 160 l/min
S type of operation: electrohydraulic, proportional pressure reducing valve
S supply voltage: 24 V
S connection type: AMP Junior Timer, without manual override
S without displacement sensor
S without hydraulic operation
S manual operation, lever position L (straight hand lever)
S damping orifice (on both sides)
S secondary valves DA: shock valve = 230 bar with make-up function, DB: make-up valve
SC18-Y1G0-D200/D080-
A260/160A00-E31A0N-X-HL-
K230/N000-B-V0
3 2nd actuator module
S pressure compensator without load-holding function
S actuator section number: 2
S connection type: threaded G1”, ports A and B: open
S primary pressure cut-off: D6 = 310 bar, D7 = 60 bar
S spool with 3 positions, spool type C
S flow rate for actuators A and B: 210 l/min
S type of operation: electrohydraulic, on-board electronics (OBE)
S supply voltage: 24 V
S connection type: DT14-6P, without manual override
S displacement sensor, without main spool stroke limitation
S without hydraulic operation
S without manual operation
S damping orifices (on both sides)
S without secondary valves
SC18-Y2G0-D310/D060-
C210/210A00-E36C0B-X-XX-
X000/X000-B-W8
4 3rd actuator module
S pressure compensator without load-holding function
S actuator section number: 3
S connection type: threaded G1”, ports A and B: open
S without spacer plate
S primary pressure cut-off D6 and D7: 230 bar
S spool with 3 operating positions, spool diagram C
S flow rate for actuators A and B: 260 l/min
S without electrohydraulic operation
S without displacement sensor
S hydraulic operation, vertical port (standard)
S without manual operation
S damping orifices (on both sides)
S secondary valves DA and DB: anti-shock valves = 260 bar with make-up function
SC18-Y3G0-D230/D230-
C260/260A00-X00X0N-Y-XX-
K260/K260-B-V2
5 End module
S end module (right side), port XL1 not available
S non-functional, module mounting thread: M10
SC18-EXX-00X-XX-XX-B-V0
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10.2 Valve System with Bolt-On Plates
1
4
3
2
370 bar
D1
DUE1
X1T MP PXL Y
G2
D2
DUE0
35 bar
X2
D3
45 bar
D6
D7
A
C230/180
250 bar
200 bar
B
DUE7
DUE8
DB
DA
A
C210/210
B
DUE7
DUE8
D6
XLA
XLB
D7
TE PE
s
s
310 bar
260 bar
6
6
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Pos. Unit Ordering code
General
S valve series: SC
S nominal size: 18
1 Inlet module
S system pressure relief: 370 bar
S connection type: flange and inch-threaded connection
S without load-sensing pressure relief
S pilot oil supply / pilot oil return: intern
S pilot-pressure conditioning
S without pilot-pressure cut-off
S without pressure peak reduction
SC18-MF370-001-3545-
00X-00-B-V0T1
2 1st actuator module with bolt-on plate
S pressure compensator without load-holding function
S actuator section number: 1
S connection type: flange (metric), ports A and B: open
S without spacer plate
S primary pressure cut-off: D7 = 250 bar, D7 = 200 bar
S spool with 3 positions, spool diagram C
S flow rate for actuator A = 230 l/min, actuator B = 180 l/min
S type of operation: electrohydraulic, on-board electronics (OBE)
S supply voltage: 24 V
S connection type: DT14-6P, without emergency operation
S displacement sensor
S stroke limitation (A-side / B-side) located on the A-side
S without hydraulic operation
S manual operation, lever position L (straight hand lever)
S damping orifice (on both sides)
S secondary valves: DA – blanking plug, DB – make-up valve
SC18-Y1F0-D250/D200-
C230/180A00-E36C0B-X-HL-
S000/N000-B-W13
3 2nd actuator module (spacer plate) with bolt-on section
S pressure compensator without load-holding function
S actuator section number: 2
S connection type: flange (metric), ports A and B: open
S spacer plate
S bolt-on section: separate load-sensing tap (Option: V49)
S primary pressure cut-off: D6 = 310 bar, D7 = 260 bar
S spool with 3 positions, spool diagram C
S flow rate for actuators A and B: 210 l/min
S type of operation: electrohydraulic, on-board electronics (OBE)
S supply voltage: 24 V
S connection type: DT14-6P, without manual override
S displacement sensor, without main spool stroke limitation
S without hydraulic operation
S without manual operation
S damping orifice (on both sides)
S without secondary valves
SC18-Y2F1-A310/A260-
C210/210A00-E36C0B-X-XX-
X000/X000-B-V74
4 End module
S End module (right side), port XL1 not available
S flange mounting: metric
S additional ports P and T: open
S tank bridge
SC18-EFX-11X-XX-XX-B-V2
301-P-9050089-ENG-04/09.2025
Series SC 18
76/78
11 Dimension of the Unit
11.1 Valve System without Bolt-On Sections
According to ordering example in Chapter 10.1
Pos Modul
1 inlet module M
2 1. actuator module Y
3 2. actuator module Y
4 3. actuator module Y
5 end module
149
ca.176
149
64 55 55 55
20
ca.264
20
0
90
38
112
20
0
90
24
0
91.5
146.5
201.5
239
160
205ca.121
ca.362
ca.
ca.453
56
81
ca.322
13
0
52
71
126.5
121
31
0
66.5
98
101
13
72
66
14
0
95
180
62
14
0
34
52
204.5
239
25
70
140
185
ca.192
ca.223
pressure valve D1
(system pressure relief)
stroke limiter B-side
M10x17
M10x17
stroke limiter A-side
name plate
primary pressure
cut-off D7, B-side
primary pressure
cut-off D6, A-side
pilot valve b
(flow rate, A-side)
pilot valve a
(flow rate, B-side)
hand lever
(standard; straight)
M10x17
M10x17
12345
secondary valve DA
A-Seite
secondary valve DB
B-side
tie bolts
stroke limiter A-side
301-P-9050089-ENG-04/09.2025
Series SC 18
77/78
11.2 Valve System with Bolt-On Sections
According to ordering example in Chapter 10.2
Pos Module
1 inlet module M
2 1. actuator module Y
3 2. actuator module Y
4 end module
64655564
4.5
ca.269
149
37
20
172
149
ca.192
202
207
20
0
90
111
38
24
0
91.5
156.5
238
23.8
50.8
14
0
40.5
97
126.5
82
42
0
57
112
100
13
72
76
10
0
82
67
0
114.5
129
150
180
14
0
144.5
168.5
238
34
160 45
ca.268
ca.432
ca.
357
ca.
141
ca.523
ca.223
27.8
57.2
58.7
30.2
M10x17
M10x17
M12x23
M10x22
name plate
hand lever
(standard; straight)
123 4
stroke limitor B-side
manual operation OBE
stroke limitor A-side
secondary valve
A-side
tie bolts
manual operation OBE
Primary pressure cut-off D6
A-side
Primary pressure cut-off D7
B-side
Pressure valve D1
(system pressure
relief)
spacer
plate
Primary pressure
cut-off D6
A-side
Primary pressure
cut-off D7
B-side
301-P-9050089-ENG-04/09.2025
Series SC 18
78/78
12 Note
This catalogue is intended for users with specialist knowl
edge. The user must check the suitability of the equipment
described herein in order to ensure that all of the conditions
necessary for the safety and proper functioning of the sys
tem are fulfilled. If you have any doubts or questions con
cerning the use of these valves, please contact Bucher
Hydraulics.
13 Related Datasheets
Description Data sheet
Electrohydraulic actuator 100-P-000230
Proportional valves sectional design
Series SC22
301-P-9050084
Proportional valves sectional design
Series SVC25
301-P-9050085
Proportional Pressure Relief Cartridge, Size 2 ... 4
(Series DBDTC-1L...)
400-P-585111
Proportional directional valve
Series L.8S
100-P-000047
Proportional directional valve system SC12 301-P-9050091
2/2 Directional seat valves size 3
(Series WSP22GNA3…/WSP22ONA3…)
400-P-120801
3/2 Cartridge spool valves size 3
(Series WKP32GNA3…/WKP32ONA3…)
400-P-120821
E 2025 by Bucher Hydraulics Remscheid GmbH, D-42861 Remscheid
www.bucherhydraulics.com[email protected]
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 450