H-4WPH25HZ6X/6/V

Manufacturer: Bosch Rexroth

Material #: R901217376

Model : H-4WPH25HZ6X/6/V

***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 H-4WPH25HZ6X/6/V (R901217376) is a high-performance directional spool valve designed for precise control of hydraulic fluid flow in various applications. This valve enables the operator to start, stop, and direct the flow of hydraulic fluid with exceptional accuracy. It features a robust housing that contains the main control spool, return springs, and a pilot control valve. The main control spool is maintained in its neutral position either by these springs or through pressurization. The pilot control valve regulates this pressurization by connecting the spring chambers to the tank when in a depressurized state. The actuation of this valve can be achieved pneumatically or hydraulically, providing flexibility depending on the system requirements. When activated, the pilot control valve moves the main spool against its return springs, allowing for the connection of port P with B and A with T within the main valve body. This action is reversible upon deactivation, where the spool returns to its central position due to spring force, ensuring safe operation. An optional manual override feature is included for situations where pneumatic pressure is unavailable or during maintenance procedures. The pilot oil supply and return can be configured either internally or externally through port Y based on system design preferences. This Bosch Rexroth directional valve is designed for subplate mounting and adheres to ISO standards for porting patterns. It offers various customization options such as spring centering, adjustable switching times, preload valves, stroke settings for the main spool, and end position controls. Additionally, it can accommodate inductive position switches and proximity sensors for enhanced operational feedback. Suitable for demanding industrial applications where precise hydraulic flow control is critical, this model comes in different sizes and component series (X) with maximum operating pressures up to bar and maximum flow rates measured in liters per minute (l/min).

$2,094.00 USD

More are expected on April 28, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 28, 2025 when ordered in

This product is eligible for factory repair.

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Type of actuation: pneumatic-hydraulic For subplate mounting Porting pattern according to ISO 4401 Subplates according to data sheets 45054 to 45060 (separate order) Spring centering, spring end position or hydraulic end position Optional auxiliary operating device Switching time adjustment, optional Preload valve in channel P of the main valve, optional Stroke setting at main spool, optional Stroke setting and/or end position control, optional Inductive position switch and proximity sensors (contactless)

Type 4WPH …

The H–.WPH type valve is a directional spool valve with pneumatic-hydraulic actuation. It controls the start, stop and direction of a flow.

The directional valve basically consists of the main valve with housing (1), the main control spool (2), one or two return springs (3.1) and (3.2), as well as the pilot control valve (4).

The main control spool (2) in the main valve is held in the zero or initial position by the springs or by means of pressurization. In the initial position, the two spring chambers (5) and (7) are connected with the tank in a depressurized form via the pilot control valve (4). The pilot control valve (4) is supplied with pilot oil via the control line (6). Supply can be implemented internally or externally (externally via port X).

Upon actuation of the pilot control valve, e. g. side "a", the pilot spool (8) is moved to the left and thus, the spring chamber (7) is pressurized with pilot pressure. The spring chamber (5) remains depressurized.

The pilot pressure acts on the left side of the main control spool (2) and moves it against the spring (3.1). This connects port P with B and A with T in the main valve.

When de-energized, the control spool (8) is held in the central position or in the initial position by the return springs (9) (except impulse spool). The spring chamber (7) is unloaded to the tank.

The pilot oil from the spring chamber is displaced into channel Y via the pilot control valve (4).

The pilot oil supply and return are implemented internally or externally (externally via port Y).

An optional manual override (10) allows the control spool (8) to be moved without pneumatic pressure.

Pilot oil supply

NG10

Pilot oil supply

NG16

Pilot oil supply

NG25 (type 4W.H 22 .7X/…)

Pilot oil supply

NG25 (type 4W.H 25 .6X/…)

Pilot oil supply

Size 32

Attention!

The pilot oil supply may only be modified by authorized specialists or at the factory!

– External pilot oil supply X or return Y :

with NG10, version SO30 has to be used if sandwich plates are installed. The identification SO30 has to be used at the end of the type designation (sandwich plate). the maximum admissible operating parameters of the pilot control valve must be observed! maximum pilot pressure: please observe Technical data!

– Internal pilot oil supply (version “ET” and “E”):

minimum pilot pressure: please observe Technical data! to prevent inadmissibly high pressure peaks, a “B10” throttle insert must be provided in port P of the pilot control valve. in connection with version “H-”, the “D3” pressure reducing valve (see Pressure reducing valve) has to be installed in addition.

01	02	03	04	05	06	07		08	09	10	11	12	13		14	15	16	17	18	19
H –		WPH					/		6					/						*

01	up to 350 bar 1; 2)	H –
02	3-way version	3
02	4-way version	4
Types of actuation
03	pneumatic-hydraulic	WPH
Size
04	NG10	10
	NG16	16
	NG25 (type 4W.H 22 .7X/…)	22
	NG25 (type 4W.H 25 .6X/…)	25
	Size 32	32
Spool return in the main valve
05	by means of springs	no code
05	hydraulic 3)	H
06	Symbols; for the possible version, see "Symbols/Circuit diagrams"
Component series
07	40 to 49 – NG10 (40 to 49: unchanged installation and connection dimensions)	4X
	60 to 69 – NG25 (4W.H 25.) and NG32 (60 to 69: unchanged installation and connection dimensions)	6X
	70 to 79 – NG16 (from series 72) and NG25 (4W.H 22.) (70 to 79: unchanged installation and connection dimensions)	7X
Spool return in the pilot control valve with 2 spool positions only possible with spools B, C, D and hydraulic control spool return in the main valve:
08	With spring return	no code
	Without spring return	O
	Without spring return with detent	OF
Pilot control valve
09	with fluidic actuation (standard valve)	6
10	Without manual override	no code
10	With manual override	N
11	External pilot oil supply, external pilot oil return 1)	no code
	Internal pilot oil supply, external pilot oil return 1; 2)	E
	Pilot oil supply internal, pilot oil return internal 2)	ET
	External pilot oil supply, internal pilot oil return 1)	T
12	without switching time adjustment	no code
	Switching time adjustment as supply control	S
	Switching time adjustment as discharge control	S2
Spool position monitoring
13	Without position switch	no code
	Monitored spool position "a"	QMAG24
	Monitored spool position "b"	QMBG24
	Monitored spool position "a" and "b"	QMABG24
	Monitored rest position	QM0G24
14	Stroke setting see stroke setting in type key table
Throttle insert
15	Without throttle insert	no code
	Throttle Ø 0.8 mm	B08
	Throttle Ø 1.0 mm	B10
	Throttle Ø 1.2 mm	B12
	Throttle Ø 1.5 mm	B15
	Throttle Ø 2.0 mm	B20
	Throttle Ø 2.5 mm	B25
preload valve (not for NG10) 4)
preload valve (not for NG10) 4)
16	without preload valve	no code
16	with preload valve (pö = 4.5 bar)	P4,5
17	without pressure reducing valve	no code
17	with pressure reducing valve	D3 4)
Seal material
18	NBR seals	no code
	FKM seals (other seals upon request)	V
	Observe compatibility of seals with hydraulic fluid used.
19	Information in the plain text	*

pSt	Pilot pressure
ppilot min	Pilot pressure, minimum
ptank	Tank pressure
pö	Cracking pressure

Preferred types and standard units are contained in the EPS (standard price list).

general

Size			10	16	25 (4W.H22)	25 (4W.H25)	32
Weight (approx.)	2 spool positions	kg	6.8	8.9	11.9	18
	3 spool positions	kg	7.6	9.7	12.7	19.8	41.8
	Switching time adjustment	kg	0.8
	Pressure reducing valve	kg	0.4
Installation position			any; horizontal with valves with hydraulic control spool return “H” and spool symbol B, C, D, K, Z, Y
Ambient temperature range		°C	-30 … +50
Storage temperature range		°C	-20 … +70
Surface protection	Valve body		Coating, layer thickness max. 100 μm

hydraulic

Size				10	16	25 (4W.H22)	25 (4W.H25)	32
Maximum operating pressure	Port P		bar	350
	Anschluss A		bar	350
	Port B		bar	350
	Port T	External pilot oil return Y	bar	315	250
	Port T	Internal pilot oil return Y 1)	bar	160
	Port Y	Pilot oil return, external	bar	160
Hydraulic fluid 2)				see table
Hydraulic fluid temperature range	NBR seals		°C	-30 … +80
Hydraulic fluid temperature range	FKM seals		°C	-20 … +80
Viscosity range			mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid 3)				Class 20/18/15 according to ISO 4406 (c)
Maximum pilot pressure 4)			bar	250		210	250
Minimum pilot pressure	External or internal pilot oil supply X (with control spool D, K, E, J, L, M, Q, R, U, W)	3-spool position valve, spring-centered	bar	10	14	12.5	13	8.5
		3-spool position valve, pressure-centered	bar	-	14	-	18	8.5
		2-spool position valve with spring end position	bar	10	14		13	10
		2-spool position valve with hydraulic end position	bar	7	14	8		5
	Internal pilot oil supply X (with control spool C, F, G, H, P, T, V, Z, S)		bar	4.5 5)	4.5 6) 7)	4.5 7)
Pilot volume for switching process	3-spool position valve, spring-centered		cm³	2.04	5.72	7.64	14.2	29.4
	2-spool position valve	from zero position in switching position “a”	cm³	4.08	11.45	15.28	28.4	58.8
		from switching position “a” in zero position	cm³	-	2.9	-	7	15.1
		from zero position in switching position “b”	cm³	-	5.72	-	14.15	29.4
		from switching position “b” in zero position	cm³	-	2.83	-	5.73	14.4
Pilot flow for shortest switching time, approx.			l/min	35				45

1)	As a 3-spool position valve, pressure-centered only possible if ppilot ≥ 2 x ptank + ppilot min
2)	The ignition temperature of the process and operating medium used must be over the maximum solenoid surface temperature.
3)	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.
4)	Internal pilot oil supply: With a higher pilot pressure, use of a pressure reducing valve is required. In connection with version “H-”, the “D3” pressure reducing valve must be additionally provided. (If it is not used, pilot pressure = operating pressure at the port) External pilot oil return: In connection with version “H-”, compliance with the maximum pilot pressure must be ensured by appropriate measures (e. g. protection of the separate pilot oil circuit by means of a pressure relief valve)!
5)	For symbols C, F, G, H, P, T, V, Z, an internal pilot oil supply is only possible if the flow from P → T in the central position (for 3-spool position valve) or while crossing the central position (for 2-spool position valve) is so large that the pressure differential of P → T reaches a value of at least 6.5 bar.
6)	Spool S only for NG16
7)	For spools C, F, G,J, H, P, T, V, Z, S – by means of preload valve (not NG10) or correspondingly high flow. (Determination of the required flow, see preload valve)

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oil		HL, HLP	FKM, NBR	DIN 51524
Bio-degradable	Insoluble in water	HEES (synthetic esters)	FKM	VDMA 24568
	Insoluble in water	HETG (rape seed oil)	FKM, NBR	VDMA 24568
	Soluble in water	HEPG (polyglycols)	FKM	VDMA 24568
Other hydraulic fluids on request

Free flow cross-sections in zero position with spools Q, V and W

Size			10	16	25 (4W.H22)	25 (4W.H25)	32
Spool Q	A – T; B – T	mm²	13	32	78	83	78
Spool V	P – A	mm²	13	32	73	83	73
Spool V	A – T; B – T	mm²	13	32	84	83	84
Spool W	A – T; B – T	mm²	2.4	6	10	14	20

Inductive position switch type QM: electrical connection

The electric connection is realized via a 4-pole mating connector (separate order) with connection thread M12 x 1.

electrical

Connection voltage (DC voltage)			V	24
Voltage tolerance (connection voltage)				+30 %/-15 %
Admissible residual ripple			%	≤ 10
Max. load capacity			mA	400
Switching outputs				PNP transistor outputs, load between switching outputs and GND
Pinout	1		V	24
	2, 4	Switching output	mA	400
	3	Earthing (GND)	V	0

For applications outside these parameters, please consult us!

Minimum pilot pressure dependent on the tank pressure

At a higher tank pressure, the minimum pilot pressure has to be increased according to this diagram.

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 10

Δp-qV characteristic curves

Piston	Spool position				Piston	Zero position
Piston	P – A	P – B	A – T	B – T	Piston	A – T	B – T	P – T
E, Y, D	2	2	4	5
F	1	4	1	4	F	3	–	6
G, T	4	2	2	6	G, T	–	–	7
H, C	4	4	1	4	H	1	3	5
J, K	1	2	1	3
L	2	3	1	4	L	3	–	–
M	4	4	3	4
P	4	1	3	4	P	–	7	5
Q, V, W, Z	2	2	3	5
R	2	2	3	–
U	3	3	3	4	U	–	4	–
B	2	2	–	–

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG10

2-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	200 bar	250 bar	315 bar
E, J, L, M, Q, R, U, V, W, C, D, K, Z, Y	160 l/min	160 l/min	160 l/min
H	160 l/min	150 l/min	120 l/min
G, T	160 l/min	160 l/min	140 l/min
F, P	160 l/min	140 l/min	120 l/min

Size 16

Δp-qV characteristic curves

Symbol	Spool position				Zero position
Symbol	P – A	P – B	A – T	B – T	P – T	A – T	B – T
D, E, Y	1	1	3	3
F	1	2	5	5	4	3	–
G	4	1	5	5	7	–	–
C, H	1	1	5	6	2	4	4
K, J	2	2	6	6	–	3	–
L	2	2	5	4	–	3	–
M	1	1	3	4
P	2	1	3	6	5	–	–
Q	1	1	6	6
R	2	4	7	–
S	3	3	3	–	9	–	–
T	4	1	5	5	7	–	–
U	2	2	3	4			6
V, Z	1	1	6	6	10	8	8
W	1	1	3	4

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG16

2-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external, spring end position in the main valve (with ppilotmin = 12 bar)
C, D, K, Y, Z	300 l/min	300 l/min	300 l/min	300 l/min	300 l/min
X external – spring end position in the main valve 1)
C	300 l/min	300 l/min	300 l/min	300 l/min	300 l/min
D, Y	300 l/min	270 l/min	260 l/min	250 l/min	230 l/min
K	300 l/min	250 l/min	240 l/min	230 l/min	210 l/min
Z	300 l/min	260 l/min	190 l/min	180 l/min	160 l/min
X external – hydraulic end position in the main valve
HC, HD, HK, HZ, HY	300 l/min	300 l/min	300 l/min	300 l/min	300 l/min

	Attention!
	1) If the specified flow values are exceeded, the function of the return spring is no longer guaranteed if the pilot pressure fails!

3-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external – spring-centered
E, H, J, L, M, Q, U, W, R	300 l/min	300 l/min	300 l/min	300 l/min	300 l/min
F, P	300 l/min	250 l/min	180 l/min	170 l/min	150 l/min
G, T	300 l/min	300 l/min	240 l/min	210 l/min	190 l/min
S	300 l/min	300 l/min	300 l/min	250 l/min	220 l/min
V	300 l/min	250 l/min	210 l/min	200 l/min	180 l/min
X external – pressure-centered (at minimum pilot pressure of 16 bar)
all spools 2)	300 l/min	300 l/min	300 l/min	300 l/min	300 l/min

	2) With spool V, the pilot control valve is not required for flows > 160 l/min.

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 25 (type W.H 22)

Δp-qV characteristic curves

Piston	Spool position					Piston	Zero position
Piston	P – A	P – B	A – T	B – T	B – A	Piston	A – T	B – T	P – T
C, E, M, P, Q, U, V, Z	2	2	1	4	–	F	–	–	4
F	1	2	1	2	–	G, P	–	–	6
G, T	2	2	2	4	–	H	–	–	2
H, J, W, K, D	2	2	1	3	–	L	4	–	–
L	2	2	1	2	–	T	–	–	5
R	1	2	1	–	5	U	–	6	–
B	2	2	–	–	–

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG25 (type W.H 22)

2-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external – spring end position in the main valve (with ppilot min = 11 bar / 14 bar)
C, D, K, Y, Z	450 l/min	450 l/min	450 l/min	450 l/min	450 l/min
X external – spring end position in the main valve 1)
C	450 l/min	450 l/min	320 l/min	250 l/min	200 l/min
D, Y	450 l/min	450 l/min	450 l/min	400 l/min	320 l/min
K	450 l/min	215 l/min	150 l/min	120 l/min	100 l/min
Z	350 l/min	300 l/min	290 l/min	260 l/min	160 l/min
X external – hydraulic end position in the main valve
HC, HD, HK, HZ, HY	450 l/min	450 l/min	450 l/min	450 l/min	450 l/min
HC./O... HD./O... HK./O... HZ./O...	450 l/min	450 l/min	450 l/min	450 l/min	450 l/min
HC./OF... HD./OF... HK./OF... HZ./OF...	450 l/min	450 l/min	450 l/min	450 l/min	450 l/min

3-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external – spring-centered
E, J, L, M, Q, U, W, R	450 l/min	450 l/min	450 l/min	450 l/min	450 l/min
H	450 l/min	450 l/min	300 l/min	260 l/min	230 l/min
G	400 l/min	350 l/min	250 l/min	200 l/min	180 l/min
F	450 l/min	270 l/min	175 l/min	130 l/min	110 l/min
V	450 l/min	300 l/min	240 l/min	220 l/min	160 l/min
T	400 l/min	300 l/min	240 l/min	200 l/min	160 l/min
P	450 l/min	270 l/min	180 l/min	170 l/min	110 l/min

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 25 (type W.H 25)

Δp-qV characteristic curves

Symbol	Spool position				Zero position
Symbol	P – A	P – B	A – T 1)	B – T 1)	A – T	B – T	P – T
E, Y, D	1	1	3	4
F	1	1	2	4	2	–	5
G, T	1	1	2	5	–	–	7
H	1	1	2	5	2	2	4
C	1	1	2	5
J	1	1	2	5	6	5	–
K	1	1	2	5
L	1	1	2	4	5	–	–
M	1	1	3	4
P	1	1	3	5	–	3	5
Q	1	1	2	3
R	1	1	3	–
U	1	1	2	5	–	5	–
V	1	1	2	5	8	7	–
Z	1	1	2	5
W	1	1	3	4
8 Symbol R, spool position B – A

1)	The pressure differential refers to the use of port T. If port T1 is additionally used, the pressure differential maybe lower. If only port T1 is used, the relations A – T and B – T may be reversed.

7	Spool G central position P – T
8	Spool T central position P – T

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG25 (type W.H 25)

2-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external – spring end position in the main valve (with ppilotmin = 13 bar)
C, D, K, Y, Z	700 l/min	700 l/min	700 l/min	700 l/min	650 l/min
X external – spring end position in the main valve 1)
C	700 l/min	700 l/min	700 l/min	700 l/min	650 l/min
D, Y	700 l/min	650 l/min	400 l/min	350 l/min	300 l/min
K	700 l/min	650 l/min	420 l/min	370 l/min	320 l/min
Z	700 l/min	700 l/min	650 l/min	480 l/min	400 l/min
X external – hydraulic end position in the main valve
HC, HD, HK, HZ, HY	700 l/min	700 l/min	700 l/min	700 l/min	700 l/min
HC./O... HD./O... HK./O... HZ./O...	700 l/min	700 l/min	700 l/min	700 l/min	700 l/min
HC./OF... HD./OF... HK./OF... HZ./OF...	700 l/min	700 l/min	700 l/min	700 l/min	700 l/min

3-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external – spring-centered
E, L, M, Q, U, W	700 l/min	700 l/min	700 l/min	700 l/min	650 l/min
G, T	400 l/min	400 l/min	400 l/min	400 l/min	400 l/min
F	650 l/min	550 l/min	430 l/min	330 l/min	300 l/min
H	700 l/min	650 l/min	550 l/min	400 l/min	360 l/min
J	700 l/min	700 l/min	650 l/min	600 l/min	520 l/min
p	650 l/min	550 l/min	430 l/min	330 l/min	300 l/min
V	650 l/min	550 l/min	400 l/min	350 l/min	310 l/min
R	700 l/min	700 l/min	700 l/min	650 l/min	580 l/min
X external – pressure-centered (at minimum pilot pressure of 18 bar)
E, F, H, J, L, M, P, Q, R, U, V, W	700 l/min	700 l/min	700 l/min	700 l/min	650 l/min
G, T	400 l/min	400 l/min	400 l/min	400 l/min	400 l/min
X external – pressure-centered (with pilot pressure > 30 bar)
G, T	700 l/min	700 l/min	700 l/min	700 l/min	650 l/min

	Attention!
	1) If the specified flow values are exceeded, the function of the return spring is no longer guaranteed if the pilot pressure fails!

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 32

∆p-qv-characteristic curves – Symbol E, R and W

Piston	Spool position
Piston	P – A	P – B	A – T	B – T	B – A
E	4	4	3	2	–
R	4	4	3	–	1
W	4	4	3	2	–

Size 32

∆p-qv- characteristic curves – Symbol G and T

Piston	Spool position
Piston	P – A	P – B	A – T	B – T	P – T
G	7	8	7	5	6
T	7	8	7	5	6

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

Size 32

2-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external – spring end position in the main valve (with ppilot min = 10 bar)
C, D, K, Y, Z	1100 l/min	1040 l/min	860 l/min	750 l/min	680 l/min
X external – spring end position in the main valve 1)
C	1100 l/min	1040 l/min	860 l/min	800 l/min	700 l/min
D, Y	1100 l/min	1040 l/min	540 l/min	480 l/min	420 l/min
K	1100 l/min	1040 l/min	860 l/min	500 l/min	450 l/min
Z	1100 l/min	1040 l/min	860 l/min	700 l/min	650 l/min
X external – hydraulic end position in the main valve
HC, HD, HK, HZ, HY	1100 l/min	1040 l/min	860 l/min	750 l/min	680 l/min

3-spool position valve – qV max
Piston	Operating pressure pmax in bar
Piston	70 bar	140 bar	210 bar	280 bar	350 bar
X external – spring-centered
E, J, L, M, Q, U, W	1100 l/min	1040 l/min	860 l/min	750 l/min	680 l/min
G, T, H, F, P	900 l/min	900 l/min	800 l/min	650 l/min	450 l/min
V	1100 l/min	1000 l/min	680 l/min	500 l/min	450 l/min
X external – pressure-centered (at minimum pilot pressure of 8.5 bar)
all spools	1100 l/min	1040 l/min	860 l/min	750 l/min	680 l/min

	1) If the specified flow values are exceeded, the function of the return spring is no longer guaranteed if the pilot pressure fails!

Performance limits: important information

Notice (applies to all sizes):

The specified switching power limits apply to the use with two directions of flow (e. g. from P to A and simultaneous return flow from B to T at a ratio of 1:1). Due to the flow forces acting within the valves, the admissible switching power limit may be considerably lower with only one direction of flow (e. g. from P to A while port B is blocked, with flow in the same or in different directions)! In such cases of application, please consult us!

The switching power limit was established while the solenoids were at operating temperature, at 10% undervoltage, and without tank preloading.

Attention!
NG16	With pilot oil supply X internal a preload valve has to be used for flows < 160 l/min due to the negative overlap of spools C, Z and HC, HZ. If the 4/3 directional valves with pressure centering of the control spool in the main valve are used exceeding the specified performance limit, a higher pilot pressure is required. For example, with an operating pressure of pmax = 350 bar and a flow of qV = 300 l/min, you need a pilot pressure of 16 bar. The maximum flow for these valves thus only depends on the Δp value acceptable for the system. With pilot oil supply X internal a preload valve (see preload valve) must generally be used due to the negative overlap of spools F, G, H, J, P, S and T.
NG25	With pilot oil supply X internal a preload valve has to be used for flows < 180 l/min due to the negative overlap of spools Z, HZ and V. With pilot oil supply X internal sufficient flow needs to be ensured due to the negative overlap of symbols C, HC, F, G, H, P and T (for determination of the required flow, see “Preload valve” characteristic curves. If the required flow is not reached, a preload valve has to be used (see technical data).
NG32	With pilot oil supply X internal a preload valve has to be used for flows < 180 l/min due to the negative overlap of spools Z, HZ and V. If the 4/3 directional valves with pressure centering of the control spool in the main valve are used exceeding the specified performance limit, a higher pilot pressure is required. For example, with an operating pressure of pmax = 350 bar and a flow of qV = 1100 l/min, you need a pilot pressure of 15 bar. The maximum flow for these valves thus only depends on the Δp value acceptable for the system. With pilot oil supply X internal a preload valve must generally be used due to the negative overlap of spools C, HC, F, G, H, P and T.

(measured with HLP46, ϑOil = 40 ±5 °C)

1)	only for NG10 and 25 (4W.H 22.) if operating pressure > tank pressure, port T is to be used as a leakage port!
2)	only type WMRH/WMUH and WMMH available.

Attention!

Caution in conjunction with differential cylinders due to pressure intensification!

Order details		Type of actuation
Symbol	Spool return	pneumatic
C, D, K, Z	../..
	..H../O
	..H../OF
B, Y	../..
Y	..H../..

	3) Example:
	– Spool E with actuating side “a” → ordering code ..EA..
	– Spool E with actuating side “b” → ordering code ..EB..
	4) Spool symbol E1-: P → A/B pre-opening

Attention!

Caution in conjunction with differential cylinders due to pressure intensification!

Order details		Type of actuation
Symbol	Actuating side	pneumatic
E, F, G, H, J, L, M, Q, R, S, T, U, V, W	.A
	.B

Inductive position switch type QM Switching logics

Version QMA

(Position switch on side B, monitored spool position of the main stage "a")

Version QMA

(Position switch on side B, monitored spool position of the main stage "a")

Version QMB

(Position switch on side A, monitored spool position of the main stage "b")

Version QMB

(Position switch on side A, monitored spool position of the main stage "b")

version QMAB

(Position switch on side A and B, monitored spool position "a" and "b")

Version QM0

(Position switch on side A and B, monitored spool position "0")

	1) No signal change at the position switch on side B with spool position "a"
	2) No signal change at the position switch on side A with spool position "b"

Version QM0

(Position switch on side B, monitored spool position of the main stage "0")

Version QM0

(Position switch on side A, monitored spool position of the main stage "0")

2 spool positions

3 spool positions

NG10

Dimensions in mm

1	Main valve
2	Pilot control valve: For unit dimensions, see basic data sheets
3	Manual override, “N”, optional Actuation of the manual override is only possible up to a tank pressure of approx. 50 bar. Avoid damage to the bore of the manual override! (Special tool for actuation, separate order, material no. R900024943).
5	Switching time adjustment (wrench size 6), optional
6	Pressure reducing valve, optional
7.1	Machined valve contact surface; porting pattern according to ISO 4401-05-05-0-05
8	Seal rings
9	Name plate complete valve

NG16

Dimensions in mm

1	Main valve
2	Pilot control valve: For unit dimensions, see basic data sheets
3	Manual override, “N”, optional Actuation of the manual override is only possible up to a tank pressure of approx. 50 bar. Avoid damage to the bore of the manual override! (Special tool for actuation, separate order, material no. R900024943).
4	Locking pin
5	Switching time adjustment (wrench size 6), optional
6	Pressure reducing valve, optional
7.2	machined valve contact surface; porting pattern according to ISO 4401-07-07-0-05
8	Seal rings
9	Name plate complete valve
10	2-spool position valves with spring end position in the main valve (spool symbols A, C, D)
11	2-spool position valves with spring end position in the main valve (spool symbols B, Y)
12	3-spool position valves, spring-centered; 2-spool position valves with hydraulic end position in the main valve

NG25 (type W.H 22)

Dimensions in mm

1	Main valve
2	Pilot control valve: For unit dimensions, see basic data sheets
3	Manual override, “N”, optional Actuation of the manual override is only possible up to a tank pressure of approx. 50 bar. Avoid damage to the bore of the manual override! (Special tool for actuation, separate order, material no. R900024943).
4	Locking pin
5	Switching time adjustment (wrench size 6), optional
6	Pressure reducing valve, optional
7.3	machined valve contact surface; porting pattern according to ISO 4401-08-08-0-05
8	Seal rings
9	Name plate complete valve

NG25 (type W.H 25)

Dimensions in mm

1	Main valve
2	Pilot control valve: For unit dimensions, see basic data sheets
3	Manual override, “N”, optional Actuation of the manual override is only possible up to a tank pressure of approx. 50 bar. Avoid damage to the bore of the manual override! (Special tool for actuation, separate order, material no. R900024943).
4	Locking pin
5	Switching time adjustment (wrench size 6), optional
6	Pressure reducing valve, optional
7.3	machined valve contact surface; porting pattern according to ISO 4401-08-08-0-05
8	Seal rings
9	Name plate complete valve
10	2-spool position valves with spring end position in the main valve (spool symbols A, C, D)
11	2-spool position valves with spring end position in the main valve (spool symbols B, Y)
12	3-spool position valves, spring-centered; 2-spool position valves with hydraulic end position in the main valve
13	3-spool position valves, pressure-centered

Size 32

Dimensions in mm

1	Main valve
2	Pilot control valve: For unit dimensions, see basic data sheets
3	Manual override, “N”, optional Actuation of the manual override is only possible up to a tank pressure of approx. 50 bar. Avoid damage to the bore of the manual override! (Special tool for actuation, separate order, material no. R900024943).
4	Locking pin
5	Switching time adjustment (wrench size 6), optional
6	Pressure reducing valve, optional
7.4	machined valve contact surface; porting pattern according to ISO 4401-10-09-0-05
8	Seal rings
9	Name plate complete valve
10	2-spool position valves with spring end position in the main valve (spool symbols A, C, D)
11	2-spool position valves with spring end position in the main valve (spool symbols B, Y)
12	3-spool position valves, spring-centered; 2-spool position valves with hydraulic end position in the main valve
13	3-spool position valves, pressure-centered

Subplates (separate order)

– NG10 (according to data sheet 45054)

without port X, Y:

G 534/01 (G3/4)

G 534/12 (SAE-12; 1 1/16-12)1)

with port X, Y:

G 535/01 (G3/4)

G 536/01 (G1)

G 535/12 (SAE-12; 1 1/16-12)1)

G 536/12 (SAE-16; 1 5/16-12)1)

– NG16 (according to data sheet 45056)

G 172/01 (G3/4)

G 172/02 (M27 x 2)

G 174/01 (G1)

G 174/02 (M33 x 2)

G 174/08 (flange)

G 172/12 (SAE-12; 1 1/16-12)1)

G 174/12 (SAE-16; 1 5/16-12)1)

– NG25 (type W.H 22 according to data sheet 45058)

G 151/01 (G1)

G 154/01 (G1 1/4)

G 156/01 (G1 1/2)

G 155/12 (SAE-16; 1 5/16-12)1)

G 154/12 (SAE-20; 1 5/8-20)1)

G 156/12 (SAE-24; 1 7/8-20)1)

– NG25 (type W.H 25 according to data sheet 45058)

G 151/01 (G1)

G 153/01 (G1), for valves with pressure-centered zero position

G 154/01 (G1 1/4)

G 154/08 (flange)

G 156/01 (G1 1/2)

G 153/12 (SAE-16; 1 5/16-12)1)

G 154/12 (SAE-20; 1 5/8-20)1)

G 156/12 (SAE-24; 1 7/8-20)1)

– NG32 (according to data sheet 45060)

G 157/01 (G1 1/2)

G 157/02 (M48 x 2)

G 158/10 (flange)

G 157/12 (SAE-24; 1 7/8-12)1)

1) on request

Valve mounting screws (separate order)

– NG10:

4 metric hexagon socket head cap screws

ISO 4762 - M6 x 45 - 10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 12.5 Nm ± 10%,

material no. R913000258

4 hexagon socket head cap screws UNC

1/4-20 UNC x 1 3/4″ ASTM-A574

on request

– NG16:

4 metric hexagon socket head cap screws

ISO 4762 - M10 x 60 - 10.9-flZn-240h-L

(friction coefficientμtotal = 0.09 to 0.14);

tightening torqueMA = 75 Nm ± 10%,

material no. R913000116

2 metric hexagon socket head cap screws

ISO 4762 - M6 x 60 - 10.9-flZn-240h-L

(friction coefficientμtotal = 0.09 to 0.14);

tightening torque MA = 12.5 Nm ± 10%,

material no. R913000115

4 hexagon socket head cap screws UNC

3/8-16 UNC x 2 1/4″ ASTM-A574

on request

2 hexagon socket head cap screws UNC

1/4-20 UNC x 1/4″ ASTM-A574

on request

– NG25:

6 metric hexagon socket head cap screws

ISO 4762 - M12 x 60 - 10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torqueMA = 130 Nm ± 10%,

material no. R913000121

6 hexagon socket head cap screws UNC

1/2-13 UNC x 2 1/2″ ASTM-A574

on request

– NG32:

6 metric hexagon socket head cap screws

ISO 4762 - M20 x 80 - 10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 430 Nm ± 10%,

material no. R901035246

6 hexagon socket head cap screws UNC

3/4-10 UNC x 3 1/4″ ASTM-A574

on request

Stroke setting, mounting options

The stroke of the control spool (1) is limited by the stroke setting.

The piston stroke is shortened by loosening the lock nut (2) and clockwise rotation of the adjustment spindle (3). The control chamber (4) must be depressurized for this.

NG	L4
NG	mm
10	6.5
16	10
25 (4W.H22)	9.5
25 (4W.H25)	12.5
32	15

5 adjustment range

– NG10:

1 rotation = 1 mm adjustment travel

– NG16 to 32:

1 rotation = 1.5 mm adjustment travel

Stroke setting, mounting options

Stroke limitation on side A

Stroke setting, mounting options

Stroke limitation on side B

Mounting options	NG	3-spool position valve 1)
		Spring-centered			Pressure-centered
		L1 (mm)	L2 (mm)	L3 (mm)	L1 (mm)	L2 (mm)	L3 (mm)
Stroke setting on valve side A and B	10	90	144	234
	16	100	200	300
	25 2)	96	241	337
	25 3)	123	276	399
	32	133	344	477
Stroke setting on valve side A	10	90	106	196
	16	100	156	256
	25 2)	96	193	289
	25 3)	123	225	348
	32	133	287	420
Stroke setting on valve side B	10	52	144	196	–	–	–
	16	56	200	256	81	200	281
	25 2)	48	241	289	–	–	–
	25 3)	72	276	348	107	276	283
	32	76	344	420	120	344	464

1)	With symbol A only version "11", with symbol B only version "12" possible.
2)	Version "W.H 22"
3)	Version "W.H 25"
	1) With symbol A only version "11", with symbol B only version "12" possible.
	2) Version "H-WEH 22"
	3) Version "H-WEH 25"

Mounting options	NG	2-spool position valve
		Spring end position						Hydraulic end position
		A, C, D, K, Z			B, Y			HC, HD, HK, HZ, HY
		L1 (mm)	L2 (mm)	L3 (mm)	L1 (mm)	L2 (mm)	L3 (mm)	L1 (mm)	L2 (mm)	L3 (mm)
Stroke setting on valve side A and B	10	90	144	234	90	144	234	90	144	234
	16	–	–	–	–	–	–	100	200	300
	25 1)	96	241	337	96	241	337	96	241	337
	25 2)	–	–	–	–	–	–	123	276	399
	32	–	–	–	–	–	–	133	344	477
Stroke setting on valve side A	10	90	106	196	–	–	–	90	106	196
	16	100	180	280	–	–	–	100	156	256
	25 1)	96	193	289	96	193	289	96	193	289
	25 2)	123	253	376	–	–	–	123	225	348
	32	133	316	449	–	–	–	133	287	420
Stroke setting on valve side B	10	52	144	196	52	144	196	52	144	196
	16	–	–	–	80	200	280	56	200	256
	25 1)	48	241	289	48	241	289	48	241	289
	25 2)	–	–	–	100	276	376	72	276	348
	32	–	–	–	105	344	449	76	344	420

1)	Version "W.H 22"
2)	Version "W.H 25"
	1) Type 4W.H 22
	2) Type 4W.H 25

Spool position monitoring

Dimensions in mm

Inductive position switch type QM

Dimensions in mm

1)	Without mating connector

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Mounting options – 2-spool position valve
Monitored spool position	Ordering code	NG	Hydraulic end position HC, HD, HK, HZ				Spring end position C, D, K, Z				Spring end position Y
Monitored spool position	Ordering code	NG	L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)	L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)	L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)
„a“ Position switch on side B	QMAG24	10		211	57			211	57			211	57
		16		259	55							259	55
		25 2)		294	47			294	47			294	47
		25 3)		325	72							325	72
		32		371	76							371	76
„b“ Position switch on side A	QMBG24	10	157			111	157			111	157			111
		16	159			155	159			155
		25 2)	149			192	149			192	149			192
		25 3)	172			225	172			225
		32	161			287	161			287
"a" and "b" Position switch on side A and B	QMABG24	10	157	211			157	211			157	211
		16	159	259
		25 2)	149	294			149	294			149	294
		25 3)	172	325
		32	161	371

1)	Without mating connector
2)	Version "W.H 22"
3)	Version "W.H 25"
	1) Without mating connector
	2) Type 4W.H 22..
	3) Type 4W.H 25..

Mounting options – 3-spool position valve
Monitored spool position	Ordering code	NG	Spring-centered				Pressure-centered
Monitored spool position	Ordering code	NG	L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)	L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)
„a“ Position switch on side B	QMAG24	10		211	57
		16		259	55			259	81
		25 2)		294	47
		25 3)		325	72			325	107
		32		371	76			371	120
„b“ Position switch on side A	QMBG24	10	157			111
		16	159			155
		25 2)	149			192
		25 3)	172			225
		32	161			287
"a" and "b" Position switch on side A and B	QMABG24	10	157	211
		16	159	259
		25 2)	149	294
		25 3)	172	325
		32	161	371
Zero position Position switch on side A and B 2 position switches	QM0G24 4)	10	157	211
		16	159	259
		25 2)	149	294
		25 3)	172	325
		32	161	371

1)	Without mating connector
2)	Version "W.H 22"
3)	Version "W.H 25"
4)	3-spool position valve
	1) Without mating connector
	2) Type 4W.H 22
	3) Type 4W.H 25
	4) 3-spool position valve

Mounting options – 3-spool position valve with one solenoid
Monitored spool position	Ordering code	NG	Side A (EA, FA…) Spring-centered				Solenoids on side B (EB, FB…) Spring-centered				Side A (EA, FA…) Pressure-centered
			Side A (EA, FA…) Spring-centered				Solenoids on side B (EB, FB…) Spring-centered				Side A (EA, FA…) Pressure-centered
			L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)	L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)	L1 (mm) 1)	L2 (mm) 1)	L3 (mm)	L4 (mm)
„a“ Position switch on side B	QMAG24	10		211	57
		16		259	55							259	81
		25 2)		294	47
		25 3)		325	72							325	107
		32		371								371	120
„b“ Position switch on side A	QMBG24	10					157			111
		16					159			155
		25 2)					149			192
		25 3)					172			225
		32					161			287
Zero position Position switch on side A or B 1 position switches	QM0G24 4)	10		211	57		157			111
		16		259	55		159			155		259	81
		25 2)		294	47		149			192
		25 3)		325	72		172			225		325	107
		32		371	76		161			287		371	120

	1) Without mating connector
	2) Type 4W.H 22..
	3) Type 4W.H 25..
	4) 2-spool position valve

Switching time adjustment

Type 4W.H 10 ..4X/…S, type 4W.H 10 ..4X/…S2

The switching time of the main valve (1) is influenced by using a twin throttle check valve (2) (type Z2FS 6; data sheet 27506).

Modification of supply (3) to discharge control (4):

Remove the pilot control valve (5) – The plate (6) to accept the seal rings stays in place – Turn the switching time adjustment (2) around its longitudinal axis and put it back, install the pilot control valve (5).

Notice:

The modification may only be performed by authorized specialists or at the factory!

"D3” pressure reducing valve

Type 4W.H 10 ..4X/…/..D3

The pressure reducing valve (8) has to be used at a pilot pressure above 250 bar (with type 4W.H 22 …: 210 bar) and with version “H”.

The secondary pressure is kept at a constant level of 45 bar.

Notice:

If a pressure reducing valve "D3" (8) is used, a "B10" throttle insert has to be installed in channel P of the pilot control valve. The modification may only be performed by authorized specialists or at the factory!

Preload valve (not for NG10)

In case of valves with depressurized circulation and internal pilot oil supply, the installation of the preload valve (9) in channel P of the main valve is required in order to build up the minimum pilot pressure.

The pressure differential of the preload valve is to be added to the pressure differential of the main valve (see characteristic curves) to result in one total value.

The cracking pressure is approx. 4.5 bar.

9.1	Preload valve NG16
9.2	Preload valve NG25 and NG32
10	Main valve
11	Subplate

Δp–qVcharacteristic curve (measured with HLP46, ϑOil = 40 °C ± 5 °C)

The secondary pressure is kept at a constant level of 45 bar.

1	NG16
2	NG25 (type 4W.H 25 …)
3	NG25 (type 4W.H 22 …)
4	Size 32

Type	Material number P4,5
4W.H 16 ...	R901002365
4W.H 22 ...	R900315596
4W.H 25 ...	R900303717
4W.H 32 ...	R900317066

H-4WPH25HZ6X/6/V

Manufacturer: Bosch Rexroth

Material #: R901217376

Model : H-4WPH25HZ6X/6/V

More are expected on April 28, 2025

This product is eligible for factory repair.

Type 4WPH …

Pilot oil supply

Pilot oil supply

Pilot oil supply

Pilot oil supply

Pilot oil supply

general

hydraulic

Free flow cross-sections in zero position with spools Q, V and W

Inductive position switch type QM: electrical connection

electrical

Minimum pilot pressure dependent on the tank pressure

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 10

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG10

Size 16

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG16

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 25 (type W.H 22)

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG25 (type W.H 22)

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 25 (type W.H 25)

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

NG25 (type W.H 25)

(measured with HLP46, ϑOil = 40 °C ± 5 °C)

Size 32

Size 32

Performance limits: (measured with HLP46, ϑoil = 40 ±5 °C)

Size 32

Performance limits: important information

(measured with HLP46, ϑOil = 40 ±5 °C)

Inductive position switch type QM Switching logics

Version QMA

Version QMA

Version QMB

Version QMB

version QMAB

Version QM0

Version QM0

Version QM0

2 spool positions

3 spool positions

NG10

NG16

NG25 (type W.H 22)

NG25 (type W.H 25)

Size 32

Stroke setting, mounting options

Stroke setting, mounting options

Stroke setting, mounting options

Spool position monitoring

Inductive position switch type QM

Notice:

Switching time adjustment

Type 4W.H 10 ..4X/…S, type 4W.H 10 ..4X/…S2

"D3” pressure reducing valve

Type 4W.H 10 ..4X/…/..D3

Preload valve (not for NG10)

Δp–qVcharacteristic curve (measured with HLP46, ϑOil = 40 °C ± 5 °C)

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