TECHNICAL CATALOGUE
SDN_EN_2026_01
SDN
SECTIONAL
DIRECTIONAL VALVE
350 bar 15 l/min
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Technical Data
2
SDN_EN_2026_01
INTRODUCTION FLUIDS
SDN OPERATING PARAMETERS WORKING SECTION HYDRAULIC SYMBOL
SDN are sectional directional control valves. They can be
assembled in parallel with up to 8 working sections.
SDN assemblies are suitable for compact applications, mainly
in mobile industries and in mini-power packs.
The directional valves have a thickness of 28 mm and 1/8"
BSP connections on working ports.
Inlet elements have P and T ports 1/4” BSP size.
STEP
RESPONSE
0 → 100% 25...75 ms
100 → 0% 15...25 ms
VOLTAGE
12V DC
24V DC
RANGE
TEMPERATURES:
ambient -20 to +50 °C - 4 to +122 °F
fluid -20 to +80 °C - 4 to +180 °F
FLUID VISCOSITY
range 10 - 400 cSt 60 -1900 SUS
recommended 25 cSt 120 SUS
FLUID
CONTAMINATION
ISO 4406:1999
class 20/18/15
Use mineral oil-based hydraulic fluids HL or HM type,
according to ISO 6743-4. For these fluids, use NBR seals
(standard - code N).
For fluids HFDR type (phosphate esters) use FPM seals (code
V). For the use of other kinds of fluid such as HFA, HFB, HFC,
please consult our engineering department.
Using fluids at temperatures higher than 80 °C (180 °F)
causes the accelerated degradation of seals as well as the
fluid physical and chemical properties.
From a safety standpoint, temperatures above 55 °C (130 °F)
are not recommended.
MAXIMUM
OPERATING
PRESSURE
P - A - B ports 350 bar 5000 psi
T and T1 ports 280 bar 4000 psi
FLOW CAPACITY parallel 15 l/min 4 gpm
D1 spool
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Model Number - Working Section
3
SDN_EN_2026_01
VOLTAGE
D12 12 V DC solenoid
D24 24 V DC solenoid
D00 without coil
SPOOL
see table below
MAX FLOWRATE
N 15 l/min
PORTS SIZE
B05 1/8” BSPP
MANUAL OVERRIDE
M
built-in with the tube,
pin
B
built-in with the tube,
boot protected
SDN - B05
-
-
- 1
design mark
CODE EXAMPLE:
SDN - B05D1 - D12K7 - NB - 1
COIL
K1 DIN 43650
K2 AMP Junior
K7 DT04-2P ‘deutsch’
FUNCTION
D
$%
37
E
D
DE
double solenoid
3 positions - spring centred
A
$%
37
D
D
single solenoid at side A
2 positions - spring return
B
$%
37
E
E
single solenoid at side B
2 positions - spring return
TA
$%
37
D
DE
single solenoid at side A
2 positions - spring return
TB
$%
37
E
ED
single solenoid at side B
2 positions - spring return
SEAL
N NBR
V Viton
FUNCTION D FUNCTION A FUNCTION B
FUNCTION TA FUNCTION TB
SDN - P - B1S -
INLET SECTIONS: BASIC
INLET SECTIONS: PRESSURE CONTROL
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Model Number - Inlet / Outlet Sections
4
SDN_EN_2026_01
SEAL
N NBR (standard)
V Viton
- 1
design mark
design mark
SDN - B1S -
PORTS SIZE
B1 1/4” BSPP
SEAL
N NBR (standard)
V Viton
- 1
RELIEF VALVE
140 up to 140 bar
210 up to 210 bar
320 up to 320 bar
PORTS SIZE
B1 1/4” BSPP
FUNCTION
P
pressure
control
OUTLET SECTION
SDN - 00- S - 1
design mark
MATERIAL
S steel
MATERIAL
S steel
MATERIAL
S steel
OUTLET PORT
00 blind plate
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Model Number - Assembled Valve
5
SDN_EN_2026_01
VOLTAGE
D12 12 V DC solenoid
D24 24 V DC solenoid
D00 without coil
SLICES
No. of working
valves
MAX FLOWRATE
N 15 l/min
CIRCUIT TYPE
P parallel
SDN - P
-
-
-
Project code (5 digits)
assigned by Hydreco
CODE EXAMPLE:
SDN - P4 - D12K7 - N - 20520
SEAL
N NBR
V Viton
ASSEMBLED VALVE
COIL
K1 DIN 43650
K2 AMP Junior
K7 DT04-2P ‘deutsch’
PERFORMANCE CURVES
The curves define the flow rate operating fields according to
the valve pressure. The values have been obtained according
to ISO 6403 standards, with solenoids at rated temperature
and supplied with voltage equal to 90% of the nominal volt-
age.
Values obtained with mineral oil, viscosity 36 cSt, temperature
50 °C and filtration according to ISO 4406:1999 class
18/16/13.
D1 1
D3 3
TA1, TB1 2
Please refer to curve 2 for pressure drops of
D3 spool in float position.
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Characteristic Curves
6
SDN_EN_2026_01
PRESSURE DROPS Δp-Q
TYPE
CURVE
P→A P→B A→T B→T
D1, A1, B1 1 1 2 2
D3, A3, B3 3 3 4 4
TA1, TB1 1 1 2 2
Declared IP degrees are intended according to EMC 2014/30/EU, only for both valve and connectors of an equivalent IP degree, installed
properly. Mating connectors are not included in solenoid valves delivery. Connectors for K1 coils can be ordered separately.
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Electrical Data
7
SDN_EN_2026_01
The solenoid consists of tube and coil. The coil is mounted on
the tube and fastened to it by a ring retainer.
Use coil codes in the table below to order spare parts.
DUTY CYCLE 100%
ELECTROMAGNETIC
COMPATIBILITY (EMC)
according to
European directive
2014/30/EU
PROTECTION
CLASS FOR
INSULATION
copper wire class H (180 °C)
coil class H (180 °C)
Absorbed
power
[W]
Resistance
at 20 °C
[Ω]
Current
at 20 °C
[A]
Coil codes for spare parts
K1 K2 K7
SDN WORKING SECTION
D12 21.8 6.6 1.8 1903710 1903720 1903730
D24 21.6 27 0.9 1903711 1903721 1903731
SDN - K1
ELECTRICAL CONNECTIONS AND IP DEGREES
SDN - K2
DIN 43650 (EN 175301-803)
Mating connectors type ISO 4400 / DIN 43650 (EN 175301-
803).
IP degree of electrical connection: IP65
IP degree of whole valve: IP 65
AMP Junior
IP degree of electrical connection: IP65
IP degree of whole valve: IP65
SDN - K7
DEUTSCH DT04 MALE
IP degree of electrical connection: IP65/IP69
IP degree of whole valve: IP65
IP degree according to ISO 20653: IP69K
SDN - WORKING SECTION (K7 COIL)
Ports:
A, B = 1/8” BSPP
side with
sealing rings
coil removal
space
coil removal
space
retainer
tightening torque:
3 Nm
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Installation Data
8
SDN_EN_2026_01
SECTIONAL MOUNTING INTERFACE
dimensions in mm [in]
Seals:
no. 3 O-Ring
type 106 (7.66x1.78)
manual override by
pin integrated in the
tube (code M)
manual override by
pin integrated in the
tube, boot-protected
(code B)
INLET WITH PRESSURE CONTROL VALVE SDN-P***-B15S -*-1
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Installation Data
9
SDN_EN_2026_01
BASIC INLET SDN-B15S-*-1
dimensions in mm [in]
mounting surface
with sealing rings:
no. 3 OR 106
(6.75x1.78)
90 shore A
no. 2 M6x12
no. 2
M5x12
for tie rods
mounting
surface with
sealing rings:
no. 3 OR 106
(6.75x1.78)
90 shore A
no. 2 M6x12
Ports: P, T = 1/4” BSPP
Ports: P, T = 1/4” BSPP
NOTE: please refer to page 10 for missing
dimensions of the mounting interface
socket hex
adjustment screw:
Allen key 4
clockwise rotation to
increase pressure
locking nut:
spanner 13
Pressure gauge
port: 1/8” BSP
INSTALLATION
The stacked valve assembly can be installed in any position
without impairing the proper functioning.
Ensure that there is no air in the hydraulic circuit.
Fixing kits are available. Please contact our engineering
department for dimensional check and ordering codes.
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Installation Data
10
SDN_EN_2026_01
OUTLET SECTION 00: BLIND
dimensions in mm [in]
no. 2 through holes ø5.5
for stack assembly
tie rods
no. 2 holes
M6x12
inlet plate
SDN-P140
D1
spool
D1
spool
D1
spool
outlet
plate
SDN-00
CIRCUIT EXAMPLE: PARALLEL CIRCUIT
SECTIONAL DIRECTIONAL CONTROL VALVE
S D N - Installation Data
11
SDN_EN_2026_01
IP DEGREE TIPS
The technical reference standard for IP degree is IEC 60529, which classifies and rates the degree of protection provided by
equipments and electrical enclosures against intrusions.
The first digit (6) concerns the protection from solid particles (body parts to dust).
The second digit of the IP rating concerns the liquid ingress protection. It indicates three different types of atmospheric agents from
which protection is provided:
Values from 1 to 6 → water jets.
Values 7 and 8 → immersion.
Value 9 → high pressure and high temperature water jets.
This means that IP66 covers all the lower steps, rating IP68 covers IP67 but not IP66 and lower. Instead, IP69 does not cover any of
them. Whether a device meets two types of protection requirements, it must be indicated by listing both separated by a slash.
(E.g. a marking of an equipment covered both by temporary immersion and water jets is IP66/IP68).
Hydreco Hydraulics - Version Control Number: SDN_EN_2026_01
AUSTRALIA
AUSTRALIA
INDIA
HydrecoHydraulics Pty Ltd, Regents Park (NSW)
HydrecoHydraulics Pty Ltd,Welshpool(WA)
HydrecoHydraulicsIndia Private Ltd, Bangalore
+61 2 9838 6800
+618 9377 2211
+91 80 645 36200
sales-au@hydreco.com
reception-wa@hydreco.com
sales-in@hydreco.com
APAC
EMEA
GERMANY
ITALY
ITALY
ITALY
NORWAY
UK
Hydreco Hydraulics GmbH, Helmstedt (NI)
Hydreco HydraulicsItalia Srl, Vignola (MO)
Hydreco Hydraulics Italia Srl, Parma (PR)
Hydreco Srl, San Cesario S/P (MO)
Hydreco HydraulicsNorway AS, Nittedal
Hydreco HydraulicsLtd, Poole, Dorset
+49 5351 55860
+39 059 770 0411
+39 0521 183 0520
+39 059 330 091
+47 22 90 94 10
+44 (0) 1202 627500
info@hydreco.de
sales-it@hydreco.com
sales-it@hydreco.com
cylinders@hydreco.com
post-no@hydreco.com
info-uk@hydreco.com
AMERICAS
NORTH/LATIN
HydrecoInc / Continental Hydraulics Inc, Shakopee (MN)
+1952 895 6400 sales@conthyd.com
Supported by a world w i d e network
CONTACT INFORMATION
hydreco-hydraulics
www.h y d r eco.com