RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Features
▶ With or without control spool bore
▶ Various cracking pressures ("springs")
▶ Directional function
– High-ow design
– Control spool with or without overlap
– Control spool with or without ne control range
– 2 area ratios (7% and 50%)
– Piston seal
▶ Pressure limiting function "DB"
– Control spool with or without ne control range
– Relief pressure up to 490 bar
– Piston seal
▶ Pressure reducing function "DR"
▶ Size16…32
▶ Component series 8X
▶ Maximum operating pressure 450bar
▶ Maximum ow rate 2200 l/min (Δp = 10 bar)
R0024
2-way cartridge valves
TypeLC (cartridge valves)
RE21004-01 
Edition: 2024-03
Contents
Features 1
Ordering code 2 … 6
Function, section, symbol 7 … 9
Technical data 10 … 13
Characteristic curves 14 … 18
Accessories 19
Additional functions with special versions 21, 22
Project planning information 23
"LFA" control cover 23
Further information 24
Inhalt
Features 1
Ordering code: Directional function 2
Ordering code: Directional function 3
Ordering code: Pressure limiting function 4
Ordering code: Pressure limiting function 5
Ordering code: Pressure reducing function 6
Function, section, symbol: Directional function 7
Function, section, symbol: Pressure limiting function 8
Function, section, symbol: Pressure reducing function 9
Technical data
(Please consult us for applications outside these values!)
10
Technical data: Directional function
(Please consult us for applications outside these values!)
11
Technical data: Pressure limiting function
(Please consult us for applications outside these values!)
12
Technical data: Pressure reducing function
(Please consult us for applications outside these values!)
13
Characteristic curves: Directional function
(simulated with HLP46, ϑ
oil
= 40±5°C) 14
Characteristic curves: Directional function
(simulated with HLP46, ϑ
oil
= 40±5°C) 15
Characteristic curves: Pressure limiting function
(measured with HLP46, ϑ
oil
= 40±5°C) 16
Characteristic curves: Pressure reducing function
(measured with HLP46, ϑ
oil
= 40±5°C) 17
Characteristic curves: Pressure reducing function
(measured with HLP46, ϑ
oil
= 40±5°C) 18
Accessories (separate order) 19
Additional functions with special versions (on request) 20
Additional functions with special versions 21
Function, circuit examples: Flow controller 21
Function, circuit examples: Pressure function with control
cover "LFA.WEMA" and pressure limiting pilot valve 22
Project planning information 23
"LFA" control cover 23
Further information 24
2/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Ordering code: Directional function
01 Cartridge valve LC
02 Size16 16
Size25 25
Size32 32
Control spool version (area ratios see page 7)
03 A
1
: A
2
= 2 : 1 (A
2
= 50%) A
A
1
: A
2
=14.3 : 1 (A
2
= 7%) B
Cracking pressure (in reference to version "A". Conversion to version "B" see page 11; others on request)
04 0bar (without spring) 00
Approx. 0.5 bar (especially for anti-cavitation and check valve function) 05
1)
Approx.1bar 10
1)
Approx. 2 bar (standard) 20
Approx.4bar 40
Control spool form (see symbols, page 3)
05 Control spool without overlap (standard) E
Control spool with overlap (version "A" only) F
Control spool with overlap and ne control range (version "A" only) D
Piston seal (seesymbols, page3)
06 Without seal (retrottable) L
With seal (standard) K
07 Component series 80…89(80…89: unchanged installation and connection dimensions) 8X
08 Operating pressure 420bar 420
Operating pressure 450bar 450
Bore/orice in control spool (other versions on request) (diameter in mm = ordering code/10)
09 None No code
Bore from port B to spring chamber (only "LC16B.E") B30
1)
Bore from port B to spring chamber (only "LC25B.E") B40
1)
Bore from port B to spring chamber (only "LC32B.E") B50
1)
Orice from port A to spring chamber (only "LC.A.E") Axx
Seal material (observe compatibility of seals with hydraulic uid used, seepage10)
10 NBR seals (version "450"; only on request) N
FKM seals (version "450"; only on request) F
H-Ecopur (only version "450") P
Special versions (additional special versions available on request)
11 Standard No code
Repair kit with oversize upper socket diameter (+1mm) R05
Installation space compatible version as replacement for "LC…7X/-004" and existing special cover
(larger spring installation space); only version "K"; compensation disk included
-004
01 02 03 04 05 06 07 08 09 10 11
LC 8X /
1)
Not for version "K".
2-way cartridge valve | LC 3/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Symbols
Version
"A.EK", "A.FK" "B.EK" "B.EL..B.." "A.DK"
A
B
B
A
B
A
A
B
Area ratio 2:1 (50%) Area ratio 14.3:1 (7%) Area ratio 14.3:1 (7%) Area ratio 2:1 (50%)
Ordering code: Directional function
4/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Ordering code: Pressure limiting function
01 Cartridge valve LC
02 Size16 16
Size25 25
Size32 32
03 Pressure limiting function (A
1
: A
2
= 1 : 0 (A
2
= 0%) DB
Cracking pressure (others on request)
04 0bar (without spring) 00
Approx. 2 bar (standard) 20
Approx.4bar 40
Approx.5bar 50
Approx.8bar 80
1)
Control spool form (see symbols, page 5)
05 Control spool without ne control (standard) E
Control spool with ne control D
Piston seal
06 Without seal (retrottable except version "LC16DB.D") L
With seal (standard; not version "LC16DB.D") K
07 Component series 80…89(80…89: unchanged installation and connection dimensions) 8X
08 Operating pressure 420bar 420
Operating pressure 450bar 450
Bore/orice in control spool (other versions on request) (diameter in mm = ordering code/10)
09 None No code
Bore from port A to spring chamber (only "LC16DB.D") A07
Orice from port A to spring chamber (not "LC16DB.D") Axx
2)
Seal material (observe compatibility of seals with hydraulic uid used, seepage10)
10 NBR seals (version "450"; only on request) N
FKM seals (version "450"; only on request) F
H-Ecopur (only version "450") P
Special versions (additional special versions available on request)
11 Standard No code
Repair kit with oversize upper socket diameter (+1mm) R05
Installation space compatible version as replacement for "LC…7X/-004" and existing special cover
(larger spring installation space); only version "K"; compensation disk included
-004
01 02 03 04 05 06 07 08 09 10 11
LC DB 8X /
1)
Additional intermediate cover required
▶ NG16: "LFA…D22"
▶ NG25 and 32: "LFA…D19"
2)
Orifice selection, see page 19.
2-way cartridge valve | LC 5/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Ordering code: Pressure limiting function
Symbols
Version
"DB.DK" "DB.EK" "DB.EK…Axx" "DB.80DK"
B
A
B
A
B
A
B
Selection aid to obtain set pressure
<10bar (e.g. depressurized circulation)
▶ The lowest set pressure depends on the choice of
the control spool form, the compression spring and
the mounting cover that is used. Please refer to the
corresponding data sheet for the "LFA" control cover.
▶ Please observe the following information for higher
set pressures.
NG Version Flow (limit value)
in l/min
16
"E" 300
"D" 175
25
"E" 600
"D" 300
32
"E" 800
"D" 450
Notes:
▶ The specified flows do not represent the maximum
admissible values, but indicate limits to achieve the
lowest possible circulation pressures even in the case of
a "depressurized circulation" operating mode that can be
activated in addition.
▶ The intended function is primarily decisive when selecting
the size and control spool form.
▶ Operating states in which, for example, high pressure
differentials are repeatedly reduced to the tank pressure
increase wear on the block (cavitation erosion).
6/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Ordering code: Pressure reducing function
01 02 03 04 05 06 07 08 09 10 11
LC DR E L 8X / 420
01 Cartridge valve LC
02 Size16 16
Size25 25
Size32 32
03 Pressure reducing function (A
1
: A
2
= 1 : 1 (A
2
= 0%) DR
Cracking pressure (others on request)
04 0bar (without spring) 00
Approx.2bar 20
Approx.4bar 40
Approx. 5 bar (standard) 50
Approx.8bar 80
1)
Control spool form (see symbols below)
05 Control spool with ne control (without seat) E
Control spool seal
06 Without seal L
07 Component series 80…89(80…89: unchanged installation and connection dimensions) 8X
08 Inlet pressure 420 bar (see page 10) 420
2)
Thread in control spool (other versions on request) (diameter in mm = ordering code/10)
09 None No code
Orice from port A to spring chamber Axx
3)
Seal material (observe compatibility of seals with hydraulic uid used, seepage10)
10 NBR seals N
FKM seals F
Special versions (additional special versions available on request)
11 Standard No code
Repair kit with oversize upper socket diameter (+1mm) R05
1)
Additional intermediate cover required
▶ NG16: "LFA…D22"
▶ NG25 and 32: "LFA…D19"
2)
Observe maximum pressure differential.
3)
Orifice selection, see page 19.
Symbols
Version
"DR.E" "DR.E…Axx" "DR.80E"
B
A
B
A
B
A
A
B
X
X**
X
B
A
1
↑
100 %
A
2
↑
7 %
A
3
↓
107 %
A
1
↑
100 %
A
2
↑
50 %
A
3
↓
150 %
(100 %)
(6 %)
(94 %)
(100 %)
(33 %)
(67 %)
1
4
3
2
8
5.15.2
9
A
B
X
2-way cartridge valve | LC 7/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Function, section, symbol: Directional function
2-way cartridge valves are elements that have been
designed for acompact block design. The power section
with ports A and B is inserted into an ISO 7368
installation bore and closed pressure-tight to the outside
with a control cover. The control cover thereby establishes
the connection to the spring chamber of the power
section, which is required for control of the power
section, and can additionally accommodate different pilot
control valves. By selecting the control cover type and
possible combinations with corresponding pilot control
valves, the power section can assume the pressure,
directional and throttle function or a combination of
these functions. Functionally efficient and energy-efficient
solutions are obtained through appropriate selection.
Cost-effective and compact solutions (including the
block) can be realized when the power section can
perform several functions via the control of the
control cover.
2-way cartridge valves generally consist of a control
cover(1), cartridge valve (2), and compression spring (8).
The control cover (1) can accommodate a maximum of 4
pilot oil bores. Various equipment with, for example,
stroke limitation, shuttle valves and hydraulically
controlled 3/2-way directional control valves already
make it possible to implement numerous standard
functions. Additional directional control valves expand
the range of functions.
The cartridge valve (2) consists of a two-part socket (3)
and ring (4), control spool (5) (control spool version "B"
(5.1) or "A" (5.2)) and compression spring (8).
Depending on the selected compression spring (8),
the control spool seal (9) is fitted as standard.
The function of 2-way cartridge valves is pressure-
dependent. Therefore, its effective pressurized areas A
1
,
A
2
and A
3
must be taken into account when selecting
the control spool (5).
Available area ratios A
1
:A
2
are 14.3:1 (7%) or
2:1 (50%).
The area at the valve seat A
1
is always normalized to
100% independently of the actual area ratio A
1
:A
2
.
Therefore, it is the reference for specifying the cracking
pressure for the two area ratios.
The area A
3
is the same size for both control spools
(7% or 50%) (A
3
= A
1
+ A
2
).
In general, the following applies:
The areas A
1
and A
2
act in the opening direction. Area A
3
and the compression spring (8) act in the closing
direction. The direction of action of the resulting force
from the opening and closing forces determines the spool
position of the 2-way cartridge valve.
The flow through the 2-way cartridge valves can be from
A→B or from B→A. In case of pressurization of area A
3
by
pilot oil discharge from channelB or by an external pilot
oil supply, channelA is blocked and leakage-free.
Example:
Control cover "LFA.D…F…" with
cartridge valve "LC.A20EK…"
1
5
B
X
A
4
6
2
3
8/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Function, section, symbol: Pressure limiting function
2-way cartridge valves for pressure functions
(pressure reducing function, see page 9) are pilot-
operated valves in a seat design. The power section
designed as a cartridge valve(2) is installed into
areceiving hole standardized according to ISO7368
and closed with acontrol cover(1).
The pilot control valve(4) for manual or electrically
proportional pressure adjustment is integrated into the
control cover(1) or installed on the control cover(1).
Different pressure functions can be realized through the
combination of cartridge valves and control covers.
Cartridge valve "LC.DB"
The cartridge valve (2) is available with control spool
form "D" or "E". Both versions have no effective area A
2
.
Thus, the effective area A
1
is equal to spring chamber
area A
3
.
The working pressure applied to A
1
is guided either
externally or internally via the control nozzle (5) to the
spring side (6) of the cartridge valve (2).
Below the pressure set at the pilot control valve(4),
the control spool(3) is pressure-compensated and
closed by the spring force. On reaching the set pressure,
the control spool(3) is opened and the pressure at
portA is limited according to the pressure-flow
characteristics.
Version "DK" Version "EK"
Examples:
Internal pressure feedback (version "D" and "E") External pressure feedback (version "D" and "E")
A
B
XY
T
F**X**
„LC . DB.EK..Axx
“
„LFA . DB“
A
B
XY
T
F**X**
„L
C . DB.DK“
„LFA . DB“
Notes:
▶ Alternatively, the pressure feedback can be realized
directly via an orice to the spring side (6) of the
element (see symbols below). The port X is thus
omitted on the block side.
If adaptations of the desired pressure function to
specic and different system requirements are
necessary, changing the control spool orice is
more complicated than with the external pressure
supply (pressure feedback via port X).
▶ All standard cartridge valves "LC
.DB" are pressure-
compensated when operating in a typical basic
function (pilot oil supply = pressure in port A or B).
An excessive load in the seat area of the control
spool can therefore occur in applications with an
external pilot oil supply. See "Project planning
information" on page 23.
1
5
X
B
A
4
6
2
3
2-way cartridge valve | LC 9/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Rest position open
Cartridge valve "LC.DR"
Control cover "LFA.DB"
The cartridge valve "LC.DR" (2) for pressure reducing
functions is designed as a spool construction with closing
characteristics. It has no seat face. The control cover (1)
versions "LFA.DB" are used.
The cartridge valve (2) has no effective area A
2
on port B.
Therefore, the effective area A
1
is equal to the spring
chamber area A
3
.
The working pressure required at A
1
is supplied either
externally or internally via a control nozzle (5) to the
spring side (6) of the cartridge valve (2).
Function, section, symbol: Pressure reducing function
Below the power limit and the pressure set on the
pilot control valve, the control spool (3) is pressure-
compensated and held in the control position by spring
force. Only when the set pressure at port A is reached is
the volume flow regulated according to the pressure flow
characteristics.
Features
▶ Direction of ow B→A
▶ Better closed-loop accuracy than "rest position closed"
▶ Automatic power limitation
▶ Special function with free return ow A→B on request
Basic position "open" Working position "closed"
Rest position open Rest position closed
A
B
XY
T
F**X**
„L
C . DR40EL“
„LFA . DB“
B
XY
F**X**
„L
C . DB40DK“
„LFA . DR“
Z2
M
A
10/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Technical data
(Please consult us for applications outside these values!)
1)
The product fulfills the substance requirements of the
RoHS Directive 2011/65/EU.
2)
The maximum pressure differential between ports B and A is
300 bar.
3)
The cleanliness classes specified for the components must be
adhered to in hydraulic systems. Effective filtration prevents
faults and at the same time increases the life cycle of the
components.
Hydraulic
Maximum operating pressure ▶ PortA, B
– "LC" (directional function) bar 420; 450
– "LC.DB" 420; 450
– "LC.DR" bar 420 (port B only)
2)
Hydraulic fluid See table on page 10
Hydraulic fluid temperature range °C –30 … +80 (NBR seals)
-20 … +80 (FKM and H-Ecopur seals)
Viscosity range mm
2
/s 2.8 … 500
Maximum admissible degree of contamination of the hydraulic
fluid; cleanliness class according to ISO4406(c)
Class 20/18/15
3)
Maximum flow (∆p = 10bar)
4)
l/min Size- and type-dependent; see characteristic curves,
page 14 … 18
General
Size NG 16 25 32
Weight kg 0.25 0.5 1.1
Ambient temperature range °C –30 … +80 (NBR seals)
-20 … +80 (FKM and H-Ecopur seals)
MTTF
D
values according to ENISO13849 Years 150…1200 (seedatasheet08012 for further information)
Conformity ▶ RoHS Directive 2011/65/EU
1)
Hydraulic fluid Classification Suitable sealing
materials
Standards Datasheet
Mineral oils HL, HLP, HLPD, HVLP, HVLPD NBR, FKM, H-Ecopur DIN51524 90220
Bio-degradable ▶ Insoluble in water HETG FKM, H-Ecopur
ISO15380
90221HEES FKM, H-Ecopur
▶ Soluble in water HEPG FKM ISO15380
Flame-resistant ▶ Water-free HFDU (glycol base) FKM, H-Ecopur
ISO 12922 90222HFDU (ester base) FKM, H-Ecopur
HFDR FKM
▶ Containing water HFC (Fuchs: Hydrotherm46M,
Renosafe500;
Petrofer: UltraSafe 620;
Houghton: Safe620;
Union: CarbideHP5046)
NBR
ISO 12922 90223
Important information on hydraulic uids:
▶ For further information and data on the use of other hydraulic
fluids, please refer to the datasheets above or contact us.
▶ There may be limitations regarding the technical valve data
(temperature, pressure range, life cycle, maintenance
intervals, etc.).
▶ Flame-resistant–containing water:
Due to the increased cavitation tendency with HFC hydraulic
fluids, the life cycle of the component may be reduced by up to
30% as compared to the use with mineral oil HLP. In order to
reduce the cavitation effect, it is recommended – if possible
considering conditions specific to the installation – to back up
the return flow pressure in portsT to approx.20% of the
pressure differential at the component.
4)
The indication of a maximum flow is usually normalized to
a pressure difference of 10bar and does not represent a limit
value in the case of logic elements. In particular, the flow
velocity in the pipe and line cross-sections occurring at the
maximum flow should be considered when making a selection.
2-way cartridge valve | LC 11/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Technical data: Directional function
(Please consult us for applications outside these values!)
Control spool area in cm
2
Size
Control spool area Port Version 16 25 32
A
1
A
"A" 2.08 4.26 6.79
"B" 2.92 5.73 9.51
A
2
B
"A" 1.06 1.89 3.39
"B" 0.22 0.43 0.67
A
3
X
"A" 3.14 6.16 10.18
"B" 3.14 6.16 10.18
Control spool stroke
Size
16 25 32
Stroke mm 9.0 12.0 14.0
Pilot volume cm
3
2.8 7.4 14.3
Theoretical pilot ow
5)
l/min 1.6 4.4 8.6
Note:
Control spools in design "D" are mainly used in applications
with additional stroke limitation devices and in position-
monitored versions. Due to the better ow values and thus
lower hydraulic losses, a control spool without ne control
range is recommended as standard.
5)
Reference: Switching time t =100 ms
This value is used only for estimation and is therefore not a limit
value for opening and closing times that can be obtained.
Cracking pressure inbar (without control spool seal)
Size
Direction of ow Version 16 25 32
A→B
"A00"
6)
0.02 0.03 0.05
"A05" 0.36 0.35 0.36
"A10" 0.72 0.68 0.72
"A20" 1.84 2.18 2.12
"A40" 3.37 3.90 3.80
"B00"
6)
0.01 0.02 0.04
"B05" 0.26 0.26 0.26
"B10" 0.51 0.50 0.51
"B20" 1.31 1.62 1.52
"B40" 2.04 2.90 2.70
B→A
"A00"
6)
0.04 0.05 0.1
"A05" 0.71 0.78 0.72
"A10" 1.43 1.53 1.42
"A20" 3.64 4.91 4.25
"A40" 6.68 8.74 7.6
"B00"
6)
0.24 0.25 0.5
"B05" 3.48 3.40 3.64
"B10" 7.01 6.69 7.24
"B20" 17.9 21.5 21.6
"B40" 32.9 38.3 38.6
6)
The values are derived from the weight of the control spool.
12/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Technical data: Pressure limiting function
(Please consult us for applications outside these values!)
Control spool area in cm
2
Size
Control spool area Port 16 25 32
A
1
A 2.27 4.91 8.04
A
2
B 0 0 0
A
3
X 2.27 4.91 8.04
Control spool stroke
Size
Version 16 25 32
Stroke cm "E" 6.0 6.5 8.5
cm "D" 6.5 7.5 9.6
Cracking pressure in bar (spring chamber area A
3
depressurized; without control spool seal)
Size
Version 16 25 32
"00"
6)
0.02 0.03 0.05
"20" 2 2 2
"40" 4 4 4
"50" 5 5 5
"80"
7)
8 8 8
6)
The values are derived from the weight of the control spool.
7)
Additional intermediate cover required
▶ NG16: "LFA…D22"
▶ NG25 and 32: "LFA…D19"
2-way cartridge valve | LC 13/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Technical data: Pressure reducing function
(Please consult us for applications outside these values!)
Control spool area in cm
2
Size
Control spool area Port 16 25 32
A
1
A 2.01 4.52 7.07
A
2
B 0 0 0
A
3
X 2.01 4.52 7.07
Control spool stroke
Size
16 25 32
Stroke mm 6.3 9.1 11.0
Pilot volume cm
3
1.27 4.11 7.78
Closing pressure in bar (spring chamber area A
3
depressurized)
Size
Version 16 25 32
"00"
6)
0.02 0.03 0.05
"20" 2 2 2
"40" 4 4 4
"50" 5 5 5
"80"
7)
8 8 8
6)
The values are derived from the weight of the control spool.
7)
Additional intermediate cover required
▶ NG16: "LFA…D22"
▶ NG25 and 32: "LFA…D19"
Notes:
▶ Tolerance of the stated closing pressures ±0.2 bar.
▶ The control spool is "open" in the basic position. To achieve
a controlled position, a pressure increase up to the desired
control pressure is required on the actuator side "A".
Excessively rapid connection of the system pressure
(especially in case of an incompletely prefilled actuator
volume) can therefore lead to pressure peaks.
▶ The choice of compression spring determines the power limit
and control dynamics.
▶ The control spool is inserted from the bottom side of the
socket and secured by a snap ring (spring chamber side).
0
153
2
4
6
200 400 600 800 1000
2
4
6
8
10
0
1
2
200 400 600 800 1000
2
4
6
8
10
0
1
6
2,3
5
4
200 400 600 800 1000 1200
2
4
6
8
10
0
1
2
200 400 600 800 1000 1200
2
4
6
8
10
14/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Characteristic curves: Directional function
(simulated with HLP46, ϑ
oil
= 40±5°C)
Pressure differential in bar →Pressure differential in bar →
Recommended socket alignment
Bore on bore
Flow in l/min →
Flow in l/min →
Flow in l/min →
Flow in l/min →
Pressure differential in bar →Pressure differential in bar →
∆p-q
V
characteristic curves
Size16
Control spool version "A"
Size25
Control spool version "A"
Size16
Control spool version "B"
Size25
Control spool version "B"
Notes:
▶ The specified characteristic curves were simulated with 100%
control spool stroke and an aligned socket (seesketch).
This is based on an installation geometry with maximum
bore diameters "A" and "B" and a simulation model
according to ISO 4411/2008-10-01.
▶ Typical characteristic curves that are subject to tolerance
variations.
1 Control spool form "E"; A→B
2 Control spool form "E"; B→A
3 Control spool form "D"; A→B
4 Control spool form "D"; B→A
5 Control spool form "F"; A→B
6 Control spool form "F"; B→A
1
2
5
4
3
6
0 500 1000 1500 2000 2500
2
4
6
8
10
1
2
0 500 1000 1500 2000 2500
2
4
6
8
10
2-way cartridge valve | LC 15/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Characteristic curves: Directional function
(simulated with HLP46, ϑ
oil
= 40±5°C)
Pressure differential in bar →
Flow in l/min →Flow in l/min →
Pressure differential in bar →
∆p-q
V
characteristic curves
Size32
Control spool version "A"
Size32
Control spool version "B"
Recommended socket alignment
Bore on bore
Notes:
▶ The specified characteristic curves were simulated with 100%
control spool stroke and an aligned socket (seesketch).
This is based on an installation geometry with maximum
bore diameters "A" and "B" and a simulation model
according to ISO 4411/2008-10-01.
▶ Typical characteristic curves that are subject to tolerance
variations.
1 Control spool form "E"; A→B
2 Control spool form "E"; B→A
3 Control spool form "D"; A→B
4 Control spool form "D"; B→A
5 Control spool form "F"; A→B
6 Control spool form "F"; B→A
1
2
6
8
10
12
14
2
4
15
050 100 150 200250 300
1
2
0 100 200 300 400500 600700 800
6
8
10
12
14
2
4
15
1
2
0 200 400 600 800100012001400
6
8
10
12
14
2
4
15
16/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Pressure differential in bar →Pressure differential in bar →
Pressure differential in bar →
Flow in l/min →
Flow in l/min →
Flow in l/min →
Characteristic curves: Pressure limiting function
(measured with HLP46, ϑ
oil
= 40±5°C)
Notes:
▶ The characteristic curves provided were determined at 100%
control spool stroke (without compression spring).
The measuring block is designed with the maximum
bore diameters "A" and "B".
▶ The control characteristic curves (circulation pressure,
pressure-flow dependency) are obtained by selecting the
compression spring and the control cover "LFA.DB". These
characteristic curves are shown in the relevant data sheet.
▶ The maximum flow velocities in the tank line have to be
observed for pressure limiting functions. Due to the special
seat geometry, switching cycles with an external pilot oil
supply with control spool version "E" are not recommended,
since this can lead to overloading of the seat geometry
(the operation of standard pressure limiting functions is
pressure-compensated).
▶ Typical characteristic curves that are subject to tolerance
variations.
∆p-q
V
characteristic curves
Size16
Size32
Size25
1 Control spool form "E"
2 Control spool form "D"
50
100
150
200
250
300
0255075100 125150 175200
123
5
10
15
17,5
0255075100 125150 175200
1
2
3
4
50
100
150
200
250
300
050100 150200 250300 350400 450
12 3
5
10
15
17,5
0
50 100150 200250 300350 400450
1
2
3
4
2-way cartridge valve | LC 17/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Output pressure in bar →Output pressure in bar →
Pressure differential in bar →
Minimum set pressure
inbar →
Pressure differential in bar →
Minimum set pressure
inbar →
Flow in l/min →
Flow in l/min →
Flow in l/min →
Flow in l/min →
Characteristic curves: Pressure reducing function
(measured with HLP46, ϑ
oil
= 40±5°C)
Notes:
▶ Control function only possible in direction of flow B→A.
▶ In the illustrated characteristic curves, the overall function
with the pilot components of the cartridge valve "LC.DR"
must be taken into account, e.g.
– Pressure reducing function
– Pressure compensator
– Flow controller
▶ The power limit is determined by the flow forces and back
pressure acting on the control spool.
▶ A stronger compression spring increases the power limit.
▶ Version "50" increases the power limit by approximately 20%
compared to "40"; standard installation space
▶ Typical characteristic curves that are subject to tolerance
variations.
Size16
Power limit
Size25
Power limit
Size16
Theoretical (basic position "open")
Size25
Theoretical (basic position "open")
1 Version "20"
2 Version "40" and "50"
3 Version "80"
4 Theoretical limit curve
50
100
150
200
250
300
0100 200300 500400600
123
5
10
15
0
100200 300500400600
1
2
3
4
18/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Output pressure in bar →
Pressure differential in bar →
Minimum set pressure
inbar →
Flow in l/min → Flow in l/min →
Characteristic curves: Pressure reducing function
(measured with HLP46, ϑ
oil
= 40±5°C)
Notes:
▶ Control function only possible in direction of flow B→A.
▶ In the illustrated characteristic curves, the overall function
with the pilot components of the cartridge valve "LC.DR"
must be taken into account, e.g.
– Pressure reducing function
– Pressure compensator
– Flow controller
▶ The power limit is determined by the flow forces and back
pressure acting on the control spool.
▶ A stronger compression spring increases the power limit.
▶ Version "50" increases the power limit by approximately 20%
compared to "40"; standard installation space
▶ Typical characteristic curves that are subject to tolerance
variations.
Size32
Power limit
Size32
Theoretical (basic position "open")
1 Version "20"
2 Version "40" and "50"
3 Version "80"
4 Theoretical limit curve
0.5
0.7
1
1.4
2
3
4
5
10
20
30
40
50
100
200
300
400
0.1 0.2 0.5 2345 10 15 20 30 40 50
8.0
6.0
5.0
4.0
3.5
3.02.52.01.81.51.21.00.80.70.60.5
100
0.25
1
2-way cartridge valve | LC 19/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Accessories (separate order)
Orifice Øinmm
Flow in l/min →
Pressure differential in bar →
Orices "1/16-27 NPTF" and blanking plug
Orice Øinmm Order numbers Material numbers
0.8 08 1810361029
1.0 10 1810361020
1.2 12 1810361021
1.5 15 1810361045
1.8 18 1810361024
2.0 20 1810361028
2.5 25 1810361054
3.0 30 R996001304
Blanking plug 99 1813464004
Compensation disk (1)
Size Material numbers
16 R901578885
25 R901578906
32 R901578904
Compression springs
NG Version Material numbers
Directional function Pressure function
16
"02" R900013844 –
"05" R900002110 R900002110
"10" R900002111 R900002111
"20" R900062747 R900062747
"40" R901429745 R900062754
"50" – R900062757
"80" – R900082073
25
"02" R900013845 –
"05" R900002114 R900002114
"10" R900002115 R900002115
"20" R900062762 R900062762
"40" R900062764 R900062820
"50" – R900062819
"80" – R900082072
32
"02" R900028984 –
"05" R900002116 R900002116
"10" R900002117 R900002117
"20" R900062813 R900062813
"40" R900062783 R900062810
"50" – R900062805
"80" – R900082071
Characteristic curves for selecting orices
To produce a compatible spring
projection to "LC…7X/-004" or
"LC…7X/-146".
Height compensation when special
cover "LFA" is included in the scope
of delivery of "LC…8X/-004".
20/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Additional functions with special versions (on request)
Symbol Type (examples) Component
series
Size Description/special characteristic
B
A
LC…-004 8X 16 … 32 ▶ Standard cartridge valve "LC…K" with compensation disk included
▶ This simulates the spring projection "LC…7X/-004" and
"LC…7X/-146" (with shaft seal option)
▶ The compensation disk is only required if there is no "D19"
intermediate cover or if an existing special cover cannot
be adjusted.
▶ If the compensation disk is not installed, the spring projection
is normal.
B
A
LC.A.E…-054
LC.A.D…-054
LC.B.E…-054
6X 16 … 32
16 … 32
25 … 32
▶ Pulling logic with open zero position
▶ Special cover (e.g."D54") required
B
A
LC.DB40D…-018 6X 16 … 32 Basic position "open" (only "LC.DB")
▶ Spring acts in opening direction
▶ External pilot pressure p
St
>p
A
+8bar required
▶ Direction of flow control operation: A→B
B
A
LC.DR40D…-028 6X 16 … 32 Basic position "closed" (only "LC.DR.")
▶ Spring acts in closing direction
▶ External pilot pressure p
St
>p
A
+8bar required
▶ Direction of flow control operation: B→A
T
A
X
LC.DR.D…-072 6X 25 … 32 ▶ Pressure-dependent select (DAU) function (discharge)
▶ Control via port X
▶ Special mounting hole
▶ Separate documentation on request
P
A
X
LC.DR.D…-073 6X 25 … 32 ▶ Pressure-dependent select (DAU) function (supply)
▶ Control via port X
▶ Special mounting hole
▶ Separate documentation on request
P
T
A
X
LC.DR.D…-074
LC.DR.D…-174
6X 25 … 32
32
▶ 3/2 pressure reducing function
▶ Control via port X
▶ Special mounting hole
▶ SO074: A→T restricted (20%)
▶ SO174: A→T restricted (50%)
B
A
LC…-R05 8X 16 … 32 ▶ Repair kit (socket outer diameter "top" 1mm larger than
standard size)
▶ Other dimensions and features as standard
X
A
B
X
2.1
2.2
X
X
1.1
A
B
1.2
2-way cartridge valve | LC 21/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Additional functions with special versions
Symbol Type (examples) Size Description/special characteristic
B
A
X
LC.XAB00E… 16 … 32 ▶ Blind element without control spool
▶ All channels (A, B, X) connected
▶ When using the "LFA" control cover, its spring chamber supply
may need to be closed.
Alternative: Control cover "LFA.D7X/FX99"
▶ Functionally corresponds to a standard "directional" or "DB"
element with the control spool removed
B
A
X
LC.XAF00E… 16 … 32 ▶ Blind element without control spool
▶ Channel A↔X connected
▶ ChannelB closed
▶ When using the "LFA" control cover, its spring chamber supply
may need to be closed.
Alternative: Control cover "LFA.D7X/FX99"
B
A
X
LC.X00E… 16 … 32 ▶ Blind element without control spool
▶ All channels (A, B, X) closed
▶ When using the "LFA" control cover, its spring chamber supply
may need to be closed.
Alternative: Control cover "LFA.D7X/FX99"
Function, circuit examples: Flow controller
▶ Assembly 1:
– Control cover "LFA16D8-7X/FX…",
"LFA25D16-7X/FX…" or "LFA32D16-7X/FX…"
– Cartridge valve "LC.DR80EL-8X…"
▶ Assembly 2:
– Control cover "LFA.H2-7X/F…"
– Cartridge valve "LC.A00DL-8X…"
A flow controller for high volume flows can be
implemented with a combination of assemblies 1 and 2.
Assembly 2 is used as a metering orifice, in which stroke
limitation is used to set a specific pressure drop.
The power limit of the cartridge valve "LC.DR" has to
be considered in the coordination of the flow values. It is
therefore recommended to select the spring "80" in order
to increase the power limit.
When the spring "80" is selected, a larger installation
space in the control cover is required (special cover
"LFA.D8", "LFA.D16" or a combination of intermediate
covers "LFA.D22", "LFA.D19" and standard cover
"LFA.D".
The control spool with fine control range at pos. 2.2
supports a finer adjustment of the working point via the
stroke limitation of the "LFA" control cover. No spring
("00") is required for this position.
1.1 Control cover "LFA.D8-7X/FX…"
Control cover "LFA.D16-7X/FX…"
1.2 Cartridge valve "LC.DR80EL-8X…"
2.1 Control cover "LFA.H2-7X/F…"
2.2 Cartridge valve "LC.A00DL-8X…"
A
B
XY
Z2Z1
1
2
3
22/24 LC | 2-way cartridge valve
BoschRexrothAG, RE21004-01, edition: 2024-03
Function, circuit examples: Pressure function with control cover "LFA.WEMA" and
pressure limiting pilot valve
Notes:
▶ Orifice fitting "P" and "F" in accordance with the standard
fitting for control covers "LFA.DBE"
▶ Use of the control cover "LFA.WEMA" only with pilot control
valves with internal connection P→A.
1 Proportional pressure relief valve "DBET(E)-7X/Axx…",
2 Control cover "LFA.WEMA-7X/PxxFxx",
3 Cartridge valve "LC.DB20EK-8X…"
2-way cartridge valve | LC 23/24
RE 21004-01, edition: 2024-03, Bosch Rexroth AG
Project planning information
▶ Control spool form selection aid:
– "LC.DB.E" (seat construction): high dynamics,
higher volume ows
– "LC.DB.D" (seat-spool construction): softer
response, preferable for pressure reducing functions
– As an alternative to the standard control spool,
we also offer a version with center bore. Here the
pressure feedback takes place directly via the
control spool without the additional connection line
A→X in the control block. Subsequent adjustment of
this variant is subject to costs for elevated control
requirements. Therefore, pressure feedback via
channel X is the standard recommendation.
▶ Size selection notes for "LC.DB":
– When selecting the size of an "LC.DB" cartridge
valve, the intended function of the cartridge valve is
decisive. In the case of a combined version with,
for example, "depressurized circulation",
the characteristic curves of the minimum set
pressure must be observed. If, on the other hand,
the cartridge valve is to be used only for pressure
limitation, the selection criterion is the maximum
expected ow.
– If maximum pressure relief is the only requirement,
"LC.DB" cartridge valves are often selected too
large.
▶ General information:
– Depending on the nominal size selected, certain
inow and outow geometries (block, piping) result,
which generate a corresponding volumetric ow rate.
The practically proven upper limit for using a logic
valve is 30 m/s.
▶ Spring selection aid:
– "LC.DB" standard: 2 bar; 4 bar with pressure
reducing function
– "LC.DR" standard: 5 bar; 5 … 8 bar with
"ow controller" function
▶ In directional functions, the cracking pressure is not
equal to the pressure differential "∆p." This assignment
is primarily applicable to check valve functions.
▶ External supply of the pilot pressure (external pilot
pressure source)
– In general, all "LC.DB" and "LC.DR" cartridge
valves are pressure-compensated for circuitry with
internal pilot oil return.
– For external supply, we therefore recommend an
"LFA" control cover with ow controller in supply X
in order to primarily limit the switching dynamics.
– "LC.DR": Control spool has no seat stop. Therefore,
observe the admissible control and differential
pressures.
– "LC.DB": Using control spool form "D" is
recommended
"LFA" control cover
▶ Directional function "LFA…7X", NG16 … 32 (420 bar) Datasheet21010
▶ Pressure function "LFA…7X", NG16 … 32 (420 bar) Datasheet21050
▶ Directional function "LFA…7X", NG16 … 32 (450 bar) Datasheet21030
▶ Pressure function "LFA…7X", NG16 … 32 (450 bar) Datasheet21030
BoschRexrothAG, RE21004-01, edition: 2024-03
24/24 LC | 2-way cartridge valve
Bosch Rexroth AG
Industrial Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 40 30 20
my.support@boschrexroth.com
www.boschrexroth.com
© All rights reserved to BoschRexrothAG, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event of
applications for industrial property rights.
The data specied above only serve to describe the product. As our products
are constantly being further developed, no statements concerning a certain
condition or suitability for a certain application can be derived from our
information. The information given does not release the user from the
obligation of own judgment and verication. It must be remembered that
our products are subject to a natural process of wear and aging.
Further information
▶ 2-way cartridge valves - directional functions Datasheet21010
▶ 2-way cartridge valves - pressure functions Datasheet21050
▶ 2-way cartridge valves, pressure limiting function, type-examination tested Datasheet21055
▶ 2-way cartridge valves with spool position monitoring, passively controlled Datasheet21015
▶ 2-way cartridge valves, pressure and directional functions - high pressure series Datasheet21030
▶ 2-way cartridge valve, actively controllable, typeLC2A Datasheet21040
▶ 2-way cartridge valves, pressure and directional functions - high pressure series Datasheet21045
▶ Installation bore according to ISO7368 Datasheet21067
▶ Hydraulic uids based on mineral oils Datasheet90220
▶ Environmentally compatible hydraulic uids Datasheet90221
▶ Flame-resistant, water-free hydraulic uids Datasheet90222
▶ Reliability characteristics according to ENISO13849 Datasheet08012
▶ Use of non-electrical hydraulic components in apotentially explosive environment Datasheet07011
▶ Hydraulic valves for industrial applications
Operating instructions 07600-B
▶ Information on available spare parts www.boschrexroth.com/spc