Accessories for R900721996

PROPORTIONAL DIRECTIONAL VALVE 4WRKE25W8-220L-3X/6EG24K31/A1D3M

Manufacturer: Bosch Rexroth

Material #: R900721996

Model : 4WRKE25W8-220L-3X/6EG24K31/A1D3M

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth 4WRKE25W8-220L-3X/6EG24K31/A1D3M (R900721996) is a high-performance industrial hydraulic valve designed for reliable control of oil flow direction, characterized by its linear spool valve and pilot-operated functionality. It features external pilot oil supply and return, with a spool symbol W, indicating its specific control pattern. The valve can withstand a maximum operating pressure and is capable of handling a nominal flow rate. This model boasts an electrical actuation with integrated electronics that allow for precise control through analog command values ranging from 0 to 10 V. The unit is engineered for subplate mounting with porting patterns conforming to ISO standards. It comes equipped with an electrical connector pole PE according to EN requirements, ensuring secure and reliable electrical connections. The valve operates on a supply voltage of VDC and has multiple switching positions. At the core of the 4WRKE25W8-220L-3X/6EG24K31/A1D3M's functionality is its spring-centered main control spool, which is held in position by a centering spring when not actuated. The integrated inductive position transducer provides electrical feedback on the spool's position, facilitating precise control adjustments to match the command value input. For optimal performance, this model includes a single-stage pilot control valve that works in tandem with the main stage to manage flow direction and size effectively. The proportional solenoid operation translates electric current into mechanical force without leakage due to its wet-pin design. With its robust construction and specialized features like zero point adjustment capabilities and potential for preload valve installation under certain conditions, the Bosch Rexroth 4WRKE25W8-220L-3X/6EG24K31/A1D3M offers precision and reliability for complex hydraulic systems requiring meticulous flow control.

$9,671.00 USD

More are expected on September 23, 2025

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Qty	Price	Savings
5+	$9,429.22 USD	$241.78 USD

Status: This product is temporarily out of stock.

Qty: Delivered as early as September 23, 2025 when ordered in

This product is eligible for factory repair.

Repairs from $784.00

PROPORTIONAL DIRECTIONAL VALVE 4WRKE25W8-220L-3X/6EG24K31/A1D3M

Size 25, symbol W8, electrical with integrated electronics, 24 V DC

Industrial hydraulic valve in the high performance range; reliable control of the oil flow direction according to the hydraulic symbol; high accuracy through internal piston position feedback

Unpacked Weight: 18.000 kg

Pilot-operated 2-stage proportional directional valves with electrical position feedback of the main control spool and integrated electronics (OBE) Control of flow direction and size Proportional solenoid operation For subplate mounting: Porting pattern according to ISO 4401 Electrical position feedback Spring-centered main control spool Pilot control valve: single-stage proportional directional valve Main stage with position control

Pilot control valve type 4WRAP 6 W7.3X/G24… (1st stage)

The pilot control valve is a direct operated proportional valve. The control edge geometry has been optimized for the use as pilot control valve for proportional directional valves type 4WRKE. The proportional solenoids are pressure-tight, wet-pin DC solenoids with detachable coils. They convert the electric current proportionally into mechanical force. An increase of the current results in a correspondingly higher solenoid force. The set solenoid force will remain constant over the entire control stroke.

The pilot control valve mainly consists of the housing (1), the proportional solenoid (2 and 3), the valve control spool (4) and springs (5 and 6). In non-actuated state both actuators are connected to the tank. If one of the two solenoids (2 or 3) is excited, the magnetic force will move the valve control spool (4) towards the spring (5 or 6). After having overcome the overlap area, the connection of one of the two actuators to the tank is blocked and the connection to the pressure chamber is made. There is a flow from P to the control chamber of the main stage.

Valves of type 4WRKE are 2-stage proportional directional valves. They control the flow direction and size. The main stage is position-controlled so that the control spool position is independent from flow forces also in the case of bigger flows.

The valves mainly consist of the pilot control valve (1), the housing (8), the main control spool (7), the covers (5 and 6), the centering spring (4), the inductive position transducer (9) and the pressure reducing valve (3). If there is no input signal, the main control spool (7) will be kept in the central position by the centering spring (4). Both control chambers in the covers (5 and 6) are connected to the tank via the valve control spool (2). The main control spool (7) is connected to suited control electronics via the inductive position transducer (9). Both the position change of the main control spool (7) and the change of the command value at the junction summing of the amplifier create a voltage difference. During the comparison of command value and actual value, a possible control deviation is determined via the electronics and the proportional solenoid of the pilot control valve (1) is supplied with current. The current induces a force in the solenoid which operates the control spool via a plunger in a row. The flow which is activated via the control cross-sections leads to an adjustment of the main control spool. The main control spool (7) with the core of the inductive position transducer (9) attached to it is displaced until the actual value corresponds to the command value. In controlled state, the main control spool (7) is force-balanced and kept in this controlled position. The control spool stroke and the control opening change proportionally to the command value. The control electronics is integrated in the valve. By adjusting valve and electronics, the deviation in series production of the devices is kept low.

The tank lines must not be allowed to run empty; with corresponding installation conditions, a preload valve (preload pressure approx. 2 bar) must be installed.

Valve particularities

The 2nd stage is basically set-up of modules of our proportional valves. The zero point adjustment at "zero point main stage" is made at the factory and can be adjusted in a range of ± 30% of the nominal stroke via a potentiometer in the control electronics. Access in the integrated control electronics by removing a plug screw on the front side of the cover housing. When the pilot control valve or the control electronics are exchanged, they are to be re-adjusted. All adjustments may be implemented by instructed experts only.

Notice!

Changes in the zero point may result in damage to the system and may only be implemented by instructed specialists!

Characteristic curve, linear
Spool valve
Pilot-operated
External pilot oil supply, external pilot oil return
Size 10 … 35
Component series 3X
Maximum operating pressure 350 bar
Maximum flow 300 l/min

Data Sheet	Download Data Sheet
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Spool symbol	Symbol W8
Max. pressure	350
Electrical connection description	Connector 7-pole (6 + PE) according to EN 175201-804
Productgroup ID	9,10,11,12,13,14
Number of ports	4
Type of actuation	Electrical with integrated electronics
Size	25
Electrical connector	Connector 7-pole (6 + PE)
Max. flow	870
Type of connection	Subplate mounting
Connection diagram NFPA	NFPA T3.5.1 R2-2002 D08
Size_CETOP	D08
Nominal flow	220
Connection diagram	ISO 4401-08-08-0-05
Supply voltage	24 VDC
Number of switching positions	3
Weight	18.000
Seals	NBR
Connectivity	Analog, command value ±10 V
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HFC

01	02	03	04	05	06		07		08	09	10	11		12	13	14	15
4	WRKE					‒	3X	/	6E	G24		K31	/		D3		*

01	4 main ports	4
02	Proportional directional valve with electrical position feedback and integrated electronics (OBE)	WRKE
03	Size 10	10
	Size 16	16
	Size 25	25
	Size 27	27
	Size 32	32
	Size 35	35
04	Symbols; for the possible version, see "Symbols/Circuit diagrams"	E; E1-; E3-; W6-; W8-; R; R3; EA; W6A; EB; W6B
Rated flow NG10
05	25 l/min	25 1)
	50 l/min	502)
	100 l/min	100
Rated flow NG16
05	125 l/min	1252)
	150 l/min	1502)
	200 l/min	200
	220 l/min	220
Rated flow NG25
05	220 l/min	220
05	350 l/min	350
Rated flow NG27
05	500 l/min	500
Size 32
05	400 l/min	400
05	600 l/min	600
Size 35
05	1000 l/min	1000
Characteristic curve form
06	Linear	L
06	Linear with fine control range	P
07	Component series 30 ... 39 (30 ... 39: unchanged installation and connection dimensions)	3X
08	Pilot control valve NG6 Proportional solenoid with detachable coil	6E
09	Supply voltage 24 V	G24
Pilot oil supply and return
10	External pilot oil supply, external pilot oil return	no code
	Internal pilot oil supply, external pilot oil return	E
	Pilot oil supply internal, pilot oil return internal	ET
	External pilot oil supply, internal pilot oil return	T
Electrical connection
11	Without mating connector, with connector according to DIN EN 175301-804, separate order	K31
Electrical interface
12	Command value/actual value ± 10 mA	C1
	Command value/actual value ±10 V	A1 3)
	Command value/actual value ±10 V	A5
	Command value/actual value 4 ... 20 mA	F1
13	With pressure reducing valve ZDR 6 DP0-4X/40YM-W80 (fixedly set)	D3
14	NBR seals	M
14	FKM seals	V
15	Further details in the plain text	*
1)	Only E and W6- with characteristic curve form L (linear) available
2)	Only E1- and W8- with characteristic curve form L (linear) available
3)	When replacing the component series 2X by 3X, the electronics interface A5 is to be defined (enable signal at pin C

For applications outside these parameters, please consult us!

general

Type		4WRKE
Size		10	16	25	27	32	35
Installation position		any, preferably horizontal
Ambient temperature range	°C	-20 … +50
Storage temperature range	°C	-20 … +80
Weight	kg	8.7	11.2	16.8	17	31.5	34
Sine test according to DIN EN 60068-2-6		10 cycles, 10…2000.. 10 Hz with logarithmic frequency changing speed of 1 octave/min, 5 to 57 Hz, amplitude 1.5 mm (p-p), 57 to 2000 Hz, amplitude 10g, 3 axes
Noise test according to DIN EN 60068-2-64		20…2000 Hz, amplitude 0.05g2/Hz (10gRMS) 3 axes, testing time 30 min per axis
Shock test according to DIN EN 60068-2-27		Half-sine 15g / 11 ms, 3 times in positive and 3 times in negative direction per axis, 3 axes
Damp heat according to DIN EN 60068-2-30		Variant 2: +25 °C … +55 °C, 90 % … 97 % relative humidity, 2 cycles á 24 hours

hydraulic

Size				10	16	25	27	32	35
Maximum operating pressure			bar	350
Maximum operating pressure	Port P		bar	315	350		210	350
	Port A		bar	315	350		210	350
	Port B		bar	315	350		210	350
Operating pressure range	Pilot control valve, pilot oil supply		bar	25 … 315
Maximum return flow pressure	Port T, external pilot oil return		bar	315	250		210	250
	Port T, internal pilot oil return		bar	10
	Port Y		bar	10
Maximum flow			l/min	170	460	870	1000	1600	3000
Nominal flow 1)			l/min	25 50 100	125 150 200 220	220 350	500	400 600	1000
Pilot flow	input signal 0 → 100%	Port X and Y	l/min	4.1	8.5	11.7		13
Hydraulic fluid temperature range			°C	-20 … +80
	preferably		°C	-40 … +50
Viscosity range			mm²/s	20 … 380
	preferably		mm²/s	30 … 45
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 2)	Pilot control valve			Class 18/16/13 according to ISO 4406 (c)
	Main valve			Class 20/18/15 according to ISO 4406 (c)
Hysteresis			%	≤ 1
Response sensitivity			%	≤ 0.5

1)	±10% with Δp = 10 bar, Δp = valve pressure differential
2)	The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter.

electrical

Size			10	16	25	27	32	35
Voltage type			Direct voltage
Type of signal			analog
Maximum current consumption	of the amplifier	A	1.5
	of the amplifier (impulse current)	A	3
Protection class according to DIN EN 60529			IP65 (with mating connector mounted and locked)
Power supply		V	24
Supply voltage range		V	18 … 35
Earthing (GND)		V	0
Command value input	"A1"	V	10
Command value input range	"F1"	mA	4 … 20
Actual value output	"A1"	V	10
Actual value output range	"F1"	mA	4 … 20

Hydraulic fluid	Classification	Suitable sealing materials	Standards
Mineral oils and related hydrocarbons	HL, HLP	NBR / FKM	DIN 51524
Flame-resistant - containing water	HFC (Fuchs HYDROTHERM 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922
Phosphoric acid esters	HFD-R	FKM
Important information on hydraulic fluids: For more information and data on the use of other hydraulic fluids please contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). The flash point of the process and operating medium used must be 40 K over the maximum solenoid surface temperature. Flame-resistant - containing water: Maximum pressure differential per control edge 175 bar Pressure pre-loading at the tank port > 20 % of the pressure differential, otherwise increased cavitation Life cycle as compared to operation with mineral oil HL, HLP 50 % to 100 %

(measured with HLP46, ϑÖl = 40 ±5 °C)

Control spool E, W, and R

Characteristic curve L

Control spool E, W, and R

Characteristic curve P

Transition function with stepped electric input signals

Size 10

Load function with maximum valve opening; tolerance ±10 %

Size 10

Transition function with stepped electric input signals

Size 16

Load function with maximum valve opening; tolerance ±10 %

Size 16

Transition function with stepped electric input signals

Size 25, Size 27

Load function with maximum valve opening; tolerance ±10 %

Size 25, Size 27

Transition function with stepped electric input signals

Size 32

Load function with maximum valve opening; tolerance ±10 %

Size 32

Transition function with stepped electric input signals

Size 35

Load function with maximum valve opening; tolerance ±10 %

Size 35

Symbols

With symbols E1- and W8-, the following applies:
P → A: qvmax	B → T: qv/2
P → B: qv/2	A → T: qvmax
With symbols R and R3-, the following applies:
P → A: qvmax	B → P: qv/2
P → B: qv/2	A → T: qvmax
With control spool symbols W6-, W8- and R3-, there is - in the zero position - a connection from A → T and B → T with approx. 2 % of the relevant nominal cross-section.

simplified

External pilot oil supply, external pilot oil return

Detailed

1	Pilot control valve
2	Main valve
3	Pressure reducing valve
4	Integrated electronics (OBE)

Pin assignment	Contact	Assignment interface "A1"	Assignment interface "F1"	Signal with interface A5
Power supply	A	24 V (18 V to 35 V), Imax = 1.5 A; impulse load ≤ 3 A
Power supply	B	0 V
Reference (actual value)	C	Reference potential actual value		Enable 4 to 24 V
Differential amplifier input (command value)	D	± 10 V	4 ... 20 mA	± 10 V
(command value)	E	0V reference potential to pin D		0 V reference potential for pin D and F
Measuring output (actual value)	F	± 10 V	4 ... 20 mA	± 10 V
	PE	connected to cooling element and valve housing

Command value:

Positive command value at D and reference potential at E result in flow from P → A and B → T.Negative command value at D and reference potential at E result in flow from P → B and A → T.

Connection cable:

Recommendation:

up to 25 m cable length type LiYCY 7 x 0.75 mm² up to 50 m cable length type LiYCY 7 x 1.0 mm² Connect shield to PE only on the supply side.

Notice:

Electrical signals provided via control electronics (e. g. actual value) must not be used for switching off safety-relevant machine functions.

Block diagram / pin assignment

Size 10

Dimensions in mm

1	Pilot control valve
2	Mating connector "A", color gray
3	Mating connector "B", color black
4	Space required for the connection cable and to remove the mating connector
5	Cabling
6	Mating connector, separate order
7	"D3” pressure reducing valve
8	Name plate
9	Main valve
10	Integrated electronics (OBE)
11	Identical seal rings for ports A, B, P, and T
12	Identical seal rings for ports X and Y
13	Machined valve contact surface; Porting pattern according to ISO 4401-05-05-0-05 - Ports X and Y as required

Recommended valve mounting screws (separate order):

4 hexagon socket head cap screws ISO 4762 - M6 x 45 - 10.9-flZn-240h-L

Tightening torque MA = 13.5 Nm ± 10 %, material no. R913000258 or

4 hexagon socket head cap screws ISO 4762 - M6 x 45 - 10.9

Tightening torque MA = 15.5 Nm ± 10 %

Size 16

Dimensions in mm

1	Pilot control valve
2	Mating connector "A", color gray
3	Mating connector "B", color black
4	Space required for the connection cable and to remove the mating connector
5	Cabling
6	Mating connector, separate order
7	"D3” pressure reducing valve
8	Name plate
9	Main valve
10	Integrated electronics (OBE)
11	Identical seal rings for ports A, B, P, and T
12	Identical seal rings for ports X and Y
13	Machined valve contact surface; Porting pattern according to ISO 4401-07-07-0-05 Deviating from the standard: Ports P, A, B, T Ø20 mm Minimum screw-in depth: - Ferrous metal 1.5 x Ø - Non-ferrous metal 2 x Ø
14	Locking pin

Recommended valve mounting screws (separate order):

2 hexagon socket head cap screws ISO 4762 - M6 x 60 - 10.9-flZn-240h-L

Tightening torque MA = 12.2 Nm ± 10 % , material no. R913000115

4 hexagon socket head cap screws ISO 4762 - M10 x 60 - 10.9-flZn-240h-L

Tightening torque MA = 58 Nm ± 20 %, material no. R913000116 or

2 hexagon socket head cap screws ISO 4762 - M6 x 60 - 10.9

Tightening torque MA = 15.5 Nm ± 10 %

4 hexagon socket head cap screws ISO 4762 - M10 x 60 - 10.9

Tightening torque MA = 75 Nm ± 20 %

NG25

Dimensions in mm

1	Pilot control valve
2	Mating connector "A", color gray
3	Mating connector "B", color black
4	Space required for the connection cable and to remove the mating connector
5	Cabling
6	Mating connector, separate order
7	"D3” pressure reducing valve
8	Name plate
9	Main valve
10	Integrated electronics (OBE)
11	Identical seal rings for ports A, B, P, and T
12	Identical seal rings for ports X and Y
13	Machined valve contact surface; Porting pattern according to ISO 4401-08-08-0-05 (ports X and Y as required)
14	Locking pin

NG27

Dimensions in mm

1	Pilot control valve
2	Mating connector "A", color gray
3	Mating connector "B", color black
4	Space required for the connection cable and to remove the mating connector
5	Cabling
6	Mating connector, separate order
7	"D3” pressure reducing valve
8	Name plate
9	Main valve
10	Integrated electronics (OBE)
11	Identical seal rings for ports A, B, P, and T
12	Identical seal rings for ports X and Y
13	Machined valve contact surface; Porting pattern according to ISO 4401-08-08-0-05 (Ports X, Y as required) Deviating from the standard: Ports A, B, T and P Ø32 mm
14	Locking pin

Recommended valve mounting screws (separate order):

6 hexagon socket head cap screws ISO 4762 - M12 x 60 - 10.9-flZn-240h-L

Tightening torque MA = 100 Nm ± 20 %, material no. R913000121 or

6 hexagon socket head cap screws ISO 4762 - M12 x 60 - 10.9

Tightening torque MA = 130 Nm ± 20 %

Size 32

Dimensions in mm

1	Pilot control valve
2	Mating connector "A", color gray
3	Mating connector "B", color black
4	Space required for the connection cable and to remove the mating connector
5	Cabling
6	Mating connector, separate order
7	"D3” pressure reducing valve
8	Name plate
9	Main valve
10	Integrated electronics (OBE)
11	Identical seal rings for ports A, B, P, and T
12	Identical seal rings for ports X and Y
13	Machined valve contact surface; Porting pattern according to ISO 4401-10-09-0-05 (Ports X and Y as required) Deviating from the standard: ‒ Ports P, A, B and T Ø38 mm ‒ position G11) according DIN 24340 Form A
14	Locking pin

Recommended valve mounting screws (separate order):

6 hexagon socket head cap screws ISO 4762 - M20 x 80 - 10.9-flZn-240h-L

Tightening torque MA = 340 Nm ± 20 %, material no. R901035246 or

4 hexagon socket head cap screws ISO 4762 - M20 x 80 - 10.9

Tightening torque MA = 430 Nm ± 20 %

Size 35

Dimensions in mm

1	Pilot control valve
2	Mating connector "A", color gray
3	Mating connector "B", color black
4	Space required for the connection cable and to remove the mating connector
5	Cabling
6	Mating connector, separate order
7	"D3” pressure reducing valve
8	Name plate
9	Main valve
10	Integrated electronics (OBE)
11	Identical seal rings for ports A, B, P, and T
12	Identical seal rings for ports X and Y
13	Machined valve contact surface; Porting pattern according to ISO 4401-10-09-0-05 (Ports X and Y as required) Deviating from the standard: ‒ Ports P, A, B and T Ø50 mm
14	Locating pins

Recommended valve mounting screws (separate order):

6 hexagon socket head cap screws ISO 4762 - M20 x 100 - 10.9-flZn-240h-L

Tightening torque MA = 465 Nm ± 20 %, material no. R913000386 or

6 hexagon socket head cap screws ISO 4762 - M20 x 100 - 10.9

Tightening torque MA = 610 Nm ± 20 %

Spare parts & repair

Accessories for R900721996

PROPORTIONAL DIRECTIONAL VALVE 4WRKE25W8-220L-3X/6EG24K31/A1D3M

Manufacturer: Bosch Rexroth

Material #: R900721996

Model : 4WRKE25W8-220L-3X/6EG24K31/A1D3M

More are expected on September 23, 2025

View Bulk Pricing Discounts

This product is eligible for factory repair.

Pilot control valve type 4WRAP 6 W7.3X/G24… (1st stage)

Valve particularities

Notice!

general

hydraulic

electrical

(measured with HLP46, ϑÖl = 40 ±5 °C)

Control spool E, W, and R

Control spool E, W, and R

Transition function with stepped electric input signals

Load function with maximum valve opening; tolerance ±10 %

Transition function with stepped electric input signals

Load function with maximum valve opening; tolerance ±10 %

Transition function with stepped electric input signals

Load function with maximum valve opening; tolerance ±10 %

Transition function with stepped electric input signals

Load function with maximum valve opening; tolerance ±10 %

Transition function with stepped electric input signals

Load function with maximum valve opening; tolerance ±10 %

Symbols

simplified

Detailed

Command value:

Connection cable:

Notice:

Block diagram / pin assignment

Size 10

Recommended valve mounting screws (separate order):

Size 16

Recommended valve mounting screws (separate order):

NG25

NG27

Recommended valve mounting screws (separate order):

Size 32

Recommended valve mounting screws (separate order):

Size 35

Recommended valve mounting screws (separate order):

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