Accessories for R900912521

PROPORTIONAL DIRECTIONAL VALVE 4WREE6EA32-2X/G24K31/A1V

Manufacturer: Bosch Rexroth

Material #: R900912521

Model : 4WREE6EA32-2X/G24K31/A1V

***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 4WREE6EA32-2X/G24K31/A1V (R900912521) is a high-performance industrial hydraulic valve designed for reliable control of oil flow direction and size, with a focus on precision due to its internal piston position feedback. This spool valve is direct actuated and features a symbol EA spool, indicating its specific operational characteristics. It supports a maximum operating pressure and can accommodate a nominal flow rate. The valve's actuation is electrical with integrated electronics, allowing for smooth operation and control. The Type WREE...X valves are equipped with proportional solenoids that have central threads and detachable coils, which are controlled via the integrated electronics. The valve also includes an electrical zero-point adjustment accessible through a Pg connection. Designed for subplate mounting, the 4WREE6EA32-2X/G24K31/A1V follows the porting pattern according to ISO standards. It has a spring-centered control spool that ensures the valve returns to the central position when solenoids are deenergized. The robust construction of the housing ensures durability while maintaining performance throughout its lifecycle. The connectivity options include an analog command value input ranging from 0 to 10 volts. It operates on a supply voltage of 24 VDC and features an NFPA T3.5.1 R2 D03 size CETOP D mounting pattern. The number of ports and switching positions are specified by its design, which also includes FKM seals for compatibility with various hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR. With its advanced features such as electrical position feedback and integrated on-board electronics (OBE), this valve stands out as an essential component in hydraulic systems requiring precise flow control in various applications.

$3,156.00 USD

More are expected on May 26, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as May 26, 2025 when ordered in

This product is eligible for factory repair.

Repairs from $676.00

PROPORTIONAL DIRECTIONAL VALVE 4WREE6EA32-2X/G24K31/A1V

Size 6, symbol EA, 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: 1.920 kg

Direct operated proportional directional valve with electrical position feedback and integrated electronics (OBE) Control of flow direction and size Operation by means of proportional solenoids with central thread and detachable coil For subplate mounting: Porting pattern according to ISO 4401 Spring-centered control spool

Type 4WREE...-2X/...

The 4/2 and 4/3 proportional directional valves are designed as direct operated devices in plate design. Operation by means of proportional solenoids with central thread and detachable coil. The solenoids are controlled via integrated electronics.

Set-up:

The valve basically consists of:

Housing (1) with connection surface

Control spool (2) with compression springs (3 and 4) and spring plates (5 and 6)

Solenoids (7 and 8) with central thread

Position transducer (9)

Integrated electronics (13)

Electrical zero point adjustment (12), accessible via Pg7

Function:

With de-energized solenoids (7 and 8), central position of the control spool (2) due to compression springs (3 and 4) between the spring plates (5 and 6)

Direct actuation of the control spool (2) by the control of one proportional solenoid, e. g. solenoid "b" (8)

→ Control spool (2) is moved to the left in proportion to the electrical input signal

→ Connection from P to A and B to T via orifice-type cross-sections with progressive

flow characteristics

Switching off of the solenoid (8)

→ Control spool (2) is returned to the central position by the compression spring (3)

In the de-energized state, the control spool (2) is held in a mechanical central position by the return springs of the solenoids. With control spool symbol "V", this position does not correspond to the hydraulic central position! When the electric valve control loop is closed, the control spool is positioned in the hydraulic central position.

Important notice:

The PG fitting (11) must not be opened. Mechanical adjustment of the adjustment nut located below is prohibited and damages the valve!

Valve with two spool positions: (Type 4WREE...A...)

The function of this valve version basically corresponds to the valve with three spool positions. The 2 spool position valve is, however, only equipped with solenoid “a” (7). Instead of the 2nd proportional solenoid, a plug screw (10) is installed.

Notice:

Due to the design principle, internal leakage which may increase over the life cycle is inherent to the valves.

Notice:

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

Industrial high-performance hydraulic valve
Spool valve
Direct actuated
Component series 2X
Maximum operating pressure 315 bar
Maximum flow 80 l/min
Size 6

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

Spool symbol	Symbol EA
Max. pressure	315
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	Integrated electronics
Size	6
Electrical connector	Connector 7-pole (6 + PE)
Max. flow	80
Type of connection	Subplate mounting
Connection diagram NFPA	NFPA T3.5.1 R2-2002 D03
Size_CETOP	D03
Nominal flow	32
Connection diagram	ISO 4401-03-02-0-05
Supply voltage	24 VDC
Number of switching positions	2
Weight	1.920
Seals	FKM
Connectivity	Analog, command value 0 … 10 V
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HETG,HEES,HEPG,HFDU,HFDR

01	02	03	04	05		06		07	08		09	10	11
4	WREE				‒	2X	/	G24	K31	/			*

01	4 main ports	4
02	Proportional directional valve with electrical position feedback and integrated electronics (OBE)	WREE
03	Size 6	6
	Size 10	10
04	Symbols; for the possible version, see "Symbols/Circuit diagrams"	E; E1-; V; V1-; W; W1-; EA; WA
Rated flow NG6
05	4 l/min	4
	8 l/min	8
	16 l/min	16
	32 l/min	32
Rated flow NG10
05	25 l/min	25
	50 l/min	50
	75 l/min	75
06	Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions)	2X
07	Supply voltage 24 V	G24
Electrical connection
08	Connector DIN EN 175201-804	K31
Electrical interface
09	Command value ±10 V	A1
09	Command value 4 to 20 mA	F1
Seal material
10	NBR seals	M
10	FKM seals	V
11	Further details in the plain text	*

For applications outside these parameters, please consult us!

general

Type		4WREE
Size		6	10
Installation position		any, preferably horizontal
Ambient temperature range	°C	-20 … +50
Storage temperature range	°C	-20 … +80
Weight	kg	2.4	6.5
MTTFD values according to EN ISO 13849 1)	y	150

1)	With control spool types E, E1, EA, W, W1, WA; in longitudinal control spool direction, there is sufficient positive overlap without shock/vibration load; observe the installation orientation with regard to the main direction of acceleration.

hydraulic

Size			6	10
Maximum operating pressure		bar	315
Maximum operating pressure	Port P	bar	315
	Port T	bar	210
	Port A	bar	315
	Port B	bar	315
Maximum flow		l/min	80	180
Nominal flow		l/min	4 8 16 32	25 50 75
Hydraulic fluid			see table below
Hydraulic fluid temperature range		°C	-20 … +80
	preferably	°C	+40 … +50
Viscosity range		mm²/s	20 … 380
	preferably	mm²/s	30 … 46
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1)			Class 20/18/15 according to ISO 4406 (c)
Hysteresis		%	≤ 0.1
Range of inversion		%	≤ 0.05
Response sensitivity		%	≤ 0.05
Zero shift upon change of	Hydraulic fluid temperature	%/10 K	≤ 0.15
	Operating pressure	%/100 bar	≤ 0.1

1)	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.

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
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 %

electrical

Size			6	10
Voltage type			Direct voltage
Maximum current consumption	of the amplifier	A	2
Maximum current consumption	of the amplifier (impulse current)	A	3
Solenoid coil resistance	Cold value at 20 °C	Ω	2.65	4.55
Solenoid coil resistance	Maximum hot value	Ω	4.05	6.82
Actuated time		%	100
Maximum coil temperature 1)		°C	150
Protection class according to DIN EN 60529			IP65 (with mating connector mounted and locked)
Power supply		V	24
Supply voltage range		V	19.4 … 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

1)	Due to the surface temperatures occurring at solenoid coils, the European standards ISO 13732-1 and ISO 4413 need to be adhered to.

Symbols

With symbol E1-, V1- and W1-, the following applies:
P → A: qvmax	B → T: qv/2
P → B: qv/2	A → T: qvmax
Notice: In the zero position, control spool symbols W and WA have a connection from A → T and from B → T with approx. 3% of the relevant nominal cross-section.

Type 4WREE

Pin assignment	Contact	Assignment interface "A1"	Assignment interface "F1"
Power supply	A	24 VDC (u(t) = 19,4 ... 35 V); Imax = 2 A
Power supply	B	0 V
Reference potential actual value	C	Reference contact F; Re > 50 kΩ	Reference contact F; Re < 10 Ω
Differential amplifier input (command value)	D	±10 V command value; Re > 50 kΩ	4 ...20 mA command value; Re > 100 Ω
Differential amplifier input (command value)	E	Reference potential command value
Measuring output (actual value)	F	± 10V actual value (limit load 5 mA)	4 ... 20 mA actual value; maximum load resistance 300 Ω
	PE	connected to cooling element and valve housing

Command value:
Positive command value 0 ... +10 V (or 12 ... 20 mA) at D and reference potential at E cause flow from P → A and B → T.
Negative command value 0 ... –10 V (or 12 ... 4 mA) at D and reference potential at E cause flow from P → B and A → T.
With valves with 1 solenoid on side a (e.g. variant EA and WA), a positive command value 0 ... +10 V (or 4 ... 20 mA) at D and reference potential at E result in flow from P → B and A → T.
Actual value:
Actual value 0 ... +10 V (or 12 ... 20 mA) at F and reference potential at C result in flow from P → A and B → T.
Actual value 0 ... –10 V (or 4 ... 12 mA) result in flow from P → B and A → T.
With valves with 1 solenoid, a positive actual value 0 ... +10V (or 4 ... 20 mA) at F and reference potential at C 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
External diameter see sketch of mating connector
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.

1	Material number
2	Production order number
3	Date of production
4	Serial number
5	Type designation
6	Zero point setting
7	Ramp time setting

4WREE 6

Dimensions in mm

1	Valve housing
2	Proportional solenoid "a" with inductive position transducer
3	Proportional solenoid "b"
7	Plug screw for valves with one solenoid (2 spool positions, version "EA" or "WA")
8	Identical seal rings for ports A, B, P, and T
10	Name plate
11	Machined valve contact surface; Porting pattern according to ISO 4401-03-02-0-05 (with locating hole) Deviating from the standard: - without locating hole "G" - ports P, A, B and T with Ø8 mm
12	Integrated electronics (OBE)
13	Mating connector according to DIN EN 175201-804, separate order

Recommended valve mounting screws (separate order):

4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9-flZn-240h-L

tightening torque MA = 7 Nm ± 10%, material no. R913000064 or

4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9

tightening torque MA = 8.9 Nm ± 10%

4WREE 10

Dimensions in mm

1	Valve housing
2	Proportional solenoid "a" with inductive position transducer
3	Proportional solenoid "b"
7	Plug screw for valves with one solenoid (2 spool positions, version "EA" or "WA")
8	Identical seal rings for ports A, B, P and T (T1)
10	Name plate
11	Machined valve contact surface; Porting pattern according to ISO 4401-05-04-0-05 Deviating from the standard: Port T1 with Ø11.2 mm
12	Integrated electronics (OBE)
13	Mating connector according to DIN EN 175201-804, separate order

Recommended valve mounting screws (separate order):

4 hexagon socket head cap screws ISO 4762 - M6 x 40 - 10.9-flZn-240h-L

tightening torque MA = 12.5 Nm ± 10 %, material no. R913000058 or

4 hexagon socket head cap screws ISO 4762 - M6 x 40 - 10.9

tightening torque MA = 15.5 Nm ± 10%

Spare parts & repair

Accessories for R900912521

PROPORTIONAL DIRECTIONAL VALVE 4WREE6EA32-2X/G24K31/A1V

Manufacturer: Bosch Rexroth

Material #: R900912521

Model : 4WREE6EA32-2X/G24K31/A1V

More are expected on May 26, 2025

This product is eligible for factory repair.

Type 4WREE...-2X/...

Set-up:

Function:

Important notice:

Valve with two spool positions: (Type 4WREE...A...)

Notice:

Notice:

general

hydraulic

electrical

(measured with HLP46, ϑÖl = 40 ±5 °C)

Zero flow with central control spool position “V32”

Zero flow with central control spool position “V75”

Rated flow 4 l/min at a valve pressure differential of 10 bar

Rated flow 8 l/min at a valve pressure differential of 10 bar

Rated flow 16 l/min at a valve pressure differential of 10 bar

Rated flow 32 l/min at a valve pressure differential of 10 bar

Rated flow 25 l/min at a valve pressure differential of 10 bar

Rated flow 50 l/min at a valve pressure differential of 10 bar

Rated flow 75 l/min at a valve pressure differential of 10 bar

Transition function with stepped electric input signals (4/3 valve version; control spool E)

Frequency response (4/3 valve version, control spool V)

Transition function with stepped electric input signals (4/3 valve version; control spool E)

Frequency response (4/3 valve version, control spool V)

Load function with maximum valve opening;Rated flow 4, 8, 16 and 32 l/min;Control spool V

Load function with maximum valve opening;Rated flow 25, 50 and 75 l/min;Control spool V

Symbols

Type 4WREE

Notice:

4WREE 6

Recommended valve mounting screws (separate order):

4WREE 10

Recommended valve mounting screws (separate order):

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