DIRECTIONAL SPOOL VALVE H-4WH 25 HQ6X/S2

Manufacturer: Bosch Rexroth

Material #: R978903745

Model : H-4WH 25 HQ6X/S2

***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-4WH 25 HQ6X/S2 (R978903745) is a high-performance industrial hydraulic valve designed for reliable switching of oil flow direction in accordance with its hydraulic symbol Q. This spool valve is pilot-operated and features external pilot oil supply and return. It is constructed for subplate mounting with a connection diagram compliant with NFPA T..R D SizeCETOP and ISO standards. The H-4WH 25 HQ6X/S2 valve is characterized by its spring centering control spool, which is held in the zero position by two return springs. The spool moves to the switching position when pilot pressure is applied to one of its sides, allowing for the necessary ports to be connected internally. Upon pressure relief, the opposing spring returns the spool to its initial position. This Bosch Rexroth valve supports a variety of hydraulic fluids including HL, HLP, HLPD, HVLP, HVLPD, and HFC. It has been designed with NBR seals to ensure durability and resistance against these fluids. The maximum pressure capacity and flow rates are determined by the specific model within this series. With options for stroke setting and/or spool position monitoring, this valve can be tailored to specific application requirements. Its actuation type is solenoid-actuated with an option for external pilot control through hydraulic means. The H-4WH 25 HQ6X/S2 offers flexibility in application with multiple size configurations available: Size 6, Size 10, Size 16, Size 25, and Size 32. Each component series—X10, X20, X30—ensures compatibility across various operational demands with a maximum operating pressure of up to 350 bar and maximum flow rates that vary according to size specifications. In summary, the Bosch Rexroth H-4WH 25 HQ6X/S2 (R978903745) directional spool valve offers robust performance for industrial applications requiring precise control over fluid directionality under varying pressures and flow conditions.

$1,915.00 USD

More are expected on May 27, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as May 27, 2025 when ordered in

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DIRECTIONAL SPOOL VALVE H-4WH 25 HQ6X/S2

Size 25, symbol Q, electrical with solenoid

Industrial hydraulic valve in a high performance range. Reliable switching of the oil flow direction according to hydraulic symbol.

Unpacked Weight: 17.3 kg

Type of actuation: (external pilot control): Hydraulic For subplate mounting Porting pattern according toISO 4401 4/3-, 4/2- or 3/2-way version Spring or pressure centering, spring end position or hydraulic end position Optional versions:
- Stroke setting and/or spool position monitoring

Valve type H-WH is a directional spool valve with hydraulic actuation. It controls the start, stop and direction of a flow. The directional valve basically consists of the valve housing (1), the main control spool (2), one or two return springs (3.1) and (3.2) at valves with spring return or spring centering as well as the diversion plate (11). The main control spool (2) is actuated directly by pressurization. The main control spool (2) is held in zero or initial position by springs or pressurization. Pilot oil supply and return are external (see pilot oil supply).

4/3 directional valve with spring centering of the control spool

With this version, the main control spool (2) is held in zero position by two return springs (3.1) and (3.2). The two spring chambers (6) and (8) are connected to ports X and Y via the diversion plate (11). With pilot pressure loading of one of the two front sides of the main control spool (2), the spool is moved to the switching position. In the valve, the required ports are connected in this way. The spring on the opposite side returns the spool to the zero or initial position at pressure relief of the pressurized control spool area.

Pilot oil supply (schematic illustration)

NG10

Pilot oil supply (schematic illustration)

NG16

Pilot oil supply (schematic illustration)

NG25 („W.H 22“)

Pilot oil supply (schematic illustration)

NG25 („W.H 25“)

Pilot oil supply (schematic illustration)

Size 32

Pilot oil supply		Pilot oil return
External	2, 3 closed	External	1 closed
Internal	2, 3 open	Internal	1 open

1	Plug screw M6 according to DIN 906, wrench size 3 - Pilot oil return
2	Plug screw M6 according to DIN 906, wrench size 3 - Pilot oil supply
3	Plug screw M12 x 1.5 according DIN 906, wrench size 6 - pilot oil supply

Type H-WH…

The pilot oil supply and return is implemented externally via channel X and Y.

External pilot oil supply, external pilot oil return
Spool valve
Pilot-operated
Size 10 … 32
Maximum operating pressure 350 bar
Maximum flow 1100 l/min
Component series 4X, 7X, 6X

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

Spool symbol	Symbol Q
Max. pressure	350
Productgroup ID	9,10,11,12,13,14
Number of ports	4
Type of actuation	with solenoid actuation
Size	25
Max. flow	700
Type of connection	Subplate mounting
Connection diagram NFPA	NFPA T3.5.1 R2-2002 D08
Size_CETOP	0
Connection diagram	ISO 4401-08-08-0-05
Number of switching positions	3
Weight	17.3
Seals	NBR
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HFC
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HFC

01	02	03	04	05	06	07		08	09	10	11	12		13	14	15
H –		WH					/						/			*

01	Up to 350 bar	H -
02	3-way version	3
02	4-way version	4
Type of actuation
03	hydraulic	WH
Size
04	NG10	10
	NG16	16
	NG25 (version "H-WH 22")	22
	NG25 (version "H-WH 25")	25
	Size 32	32
Spool return in the main valve
05	by means of springs	no code
05	hydraulic 1)	H
06	Symbols; for the possible version, see "Symbols/Circuit diagrams"
07	Component series 40 … 49 (40 … 49: unchanged installation and connection dimension) – NG10	4X
	Component series 60 … 69 (60 … 69: unchanged installation and connection dimension) – NG25 ("H-WH 25") and NG32	6X
	Component series 70 … 79 (70 … 79: unchanged installation and connection dimension) – NG16 (from series 72) andNG25 ("H-WH 22")	7X
Pilot oil flow
08	External pilot oil supply, external pilot oil return 2)	no code
Switching time adjustment
09	without switching time adjustment	no code
	Switching time adjustment as supply control	S
	Switching time adjustment as discharge control	S2
Corrosion resistance (outside)
10	None (valve housing primed)	no code
10	Improved corrosion protection (240 h salt spray test according to EN ISO 9227)	J3
Spool position monitoring
11	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
Stroke setting
12	For ordering code, see dimesnions
preload valve (not for NG10) 2)
13	without pressure reducing valve	no code
13	with pressure reducing valve	D3
Seal material
14	NBR seals	no code
	FKM seals	V
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
15	Further details in the plain text	*

	1) – 2 spool positions (hydraulic end position): only symbols C, D, K, Z, Y
	– 3 switching positions (hydraulically centered): only NG16, NG25 ("4W.H 25") and NG32
	2) Pilot oil supply X or return Y external:
	– Minimum pilot pressure: please observe Technical data!
	– Maximum pilot pressure: please observe Technical data!

general

Size			10	16	25 (H-WH22)	25 (H-WH25)	32
Weight (approx.)	Valve witch hydraulic actuation (type WH...)	kg	5.5	7.3	10.5	16.5	39.5
	Switching time adjustment "S" and "S2"	kg	0.8
	Pressure reducing valve "D3"	kg	0.4
Installation position			Any; horizontal with valves with hydraulic control spool return "H" and symbol A, B, C, D, K, Z, Y. With suspended installation, higher sensitivity to contamination – horizontal is recommended.
Ambient temperature range	Standard version	°C	-20 … +70
Storage temperature range		°C	+5 … +40
Surface protection	Valve body		Coating, layer thickness max. 100 μm
MTTFD values according to EN ISO 13849		Years	150

hydraulic

Size				10	16	25 (H-WH22)	25 (H-WH25)	32
Maximum operating pressure	Port P		bar	350
	Port A		bar	350
	Port B		bar	350
	Port T	External pilot oil return Y	bar	315	250
	Port Y	Pilot oil return, external	bar	250		210	250
Hydraulic fluid				see table
Hydraulic fluid temperature range	NBR seals		°C	-20 … +80
	FKM seals 1)		°C	-15 … +80
	HFC hydraulic fluid			-20 … +50 °C
Viscosity range			mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid 2)				Class 20/18/15 according to ISO 4406 (c)
Maximum pilot pressure 3)			bar	250		210	250
Minimum pilot pressure	Pilot oil supply X external or internal (with symbols D, K, E, J, L, M, Q, R, U, W)	3-spool position valve, spring-centered	bar	12	14	12.5	13	8.5
Minimum pilot pressure		2-spool position valve, spring end position	bar	10	14		13	10
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		cm³	4.08	11.45	15.28	28.4	58.8
	3-spool position valve, pressure-centered	from zero position in switching position “a”	cm³	-	2.83	-	7.15	14.4
		from switching position “a” in zero position	cm³	-	5.72	-	14.18	29.4
		from zero position in switching position “b”	cm³	-	5.72	-	14.18	29.4
		from switching position “b” in zero position	cm³	-	8.55	-	19.88	43.8
Pilot flow for shortest switching time, approx.			l/min	35				45

1)	If type WH is used in potentially explosion-proof areas, see data sheet 07011.
2)	The cleanliness classes specified for the components must beadhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components.
3)	External pilot oil supply: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 bymeans of a pressure relief valve)!

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

Size			10	16	25 (H-WH22)	25 (H-WH25)	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

Hydraulic fluid		Classification	Suitable sealing materials	Standards	Data sheet
Mineral oil		HL, HLP, HLPD, HVLP, HVLPD	NBR, FKM	DIN 51524	90220
Bio-degradable	Insoluble in water	HETG	FKM	ISO 15380	90221
	Insoluble in water	HEES	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Water-free	HFDU (glycol base)	FKM	ISO 12922	90222
Flame-resistant	Water-free	HFDU (ester base)	FKM
		HFDR	FKM

Important notice on hydraulic fluids:

For more 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.). The ignition temperature of the hydraulic fluid used must be 50 K higher than the maximum solenoid surface temperature.

• Bio-degradable and flame-resistant:

If these hydraulic fluids are used, small amounts of dissolved zinc may get into the hydraulic system (700 mg zinc per pole tube).

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!

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

NG10

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, Q, V, W, Z	1	1	3	5
F	1	3	1	4	3	–	6
G, T	4	2	4	7	–	–	8
H, C	3	3	1	7	1	5	5
J, K	1	2	1	6
L	2	2	1	4	2	–	–
M	3	3	2	5
P	3	1	2	5	–	5	7
R	1	2	3	–
U	2	2	3	6	–	6	–
A, B	2	2	–	–

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.

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

NG10

2-spool position valve – qV maxin l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring end position in the main valve1) (with ppilot min = 12 bar)
C, D, K, Y, Z	160	160	160	160	160
X external – hydraulic end position in the main valve
HC, HD, HK, HZ, HY	160	160	160	160	160

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

NG10

3-spool position valves – qV max in l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring-centered
E, J, L, M, Q, U, V, W, R	160	160	160	160	160
F, P	160	120	100	90	90
G, T	160	160	160	130	120
H	160	160	120	110	100

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

NG16

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 °C ±5 °C)

NG16

2-spool position valve – qV maxin l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring end position in the main valve1) (with ppilot min = 12 bar)
C, D, K, Y, Z	300	300	300	300	300
X external – spring end position in the main valve
C	300	300	300	300	300
D, Y	300	270	260	250	230
K	300	250	240	230	210
Z	300	260	190	180	160
X external – hydraulic end position in the main valve
HC, HD, HK, HZ, HY	300	300	300	300	300

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

NG16

3-spool position valves – qV max in l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring-centered
E, H, J, L, M, Q, U, W, R	300	300	300	300	300
F, P	300	250	180	170	150
G, T	300	300	240	210	190
S	300	300	300	250	220
V	300	250	210	200	180
X external – pressure-centered (at minimum pilot pressure of 16 bar)
all 1)	300	300	300	300	300

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

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

NG25 (type W.H 22)

Δp-qV characteristic curves

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

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

NG25 (type W.H 22)

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

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

NG25 (type W.H 22)

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

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

NG25 (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	4	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.

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

NG25 (type W.H 25)

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

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

NG25 (type W.H 25)

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

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

Size 32

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

Symbol	Spool position
Symbol	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

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

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

Size 32

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

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

Size 32

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

2 spool positions

1)	Only for NG10 and 25 ("H-WEH 22") with 3/2-way version; if operating pressure > tank pressure, port T is to be used as a leakage port!

Ordering code		Type of actuation
Symbol	Spool return	Type H-WH (hydraulic)
A 1), C, D, K, Z	../..
A 1), C, D, K, Z	..H../..
B 1),Y	../..

3 spool positions

	2)Example: Symbol E with actuating side "a" → ordering code ..EA..
	3) Symbol S only for NG16

Ordering code			Type of actuation
Symbol	Actuating side	Spool return	Type H-WH (hydraulic)
E, F, G, H, J, L, M, Q, R, S, T, U, V, W		../..
		..H../..

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")

NG10

Dimensions in mm


Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

1	Main valve
7	Height of the diversion plate with hydraulic actuation
10.1	machined valve contact surface; porting pattern according to ISO 4401-05-05-0-05
12	Name plate complete valve
13	Seal rings

NG16

Dimensions in mm


Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

1	Main valve
7	Height of the diversion plate with hydraulic actuation
10.2	machined valve contact surface; porting pattern according to ISO 4401-07-07-0-05
12	Name plate complete valve
13	Seal rings
15	2-spool position valves with spring end position in the main valve (spool symbols A, C, D, K, Z)
16	2-spool position valves with spring end position in the main valve (spool symbols B, Y)
17	3-spool position valves, spring-centered; 2-spool position valves with hydraulic end position in the main valve
19	Locking pin

NG25 (type W.H 22)

Dimensions in mm

1)	Port L only for valves with pressure-centered zero position


Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

1	Main valve
7	Height of the diversion plate with hydraulic actuation
10.3	machined valve contact surface; porting pattern according to ISO 4401-08-08-0-05
12	Name plate complete valve
13	Seal rings
19	Locking pin

NG25 (type W.H 25)

Dimensions in mm

1)	Port L only for valves with pressure-centered zero position


Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

1	Main valve
7	Height of the diversion plate with hydraulic actuation
10.3	machined valve contact surface; porting pattern according to ISO 4401-08-08-0-05
12	Name plate complete valve
13	Seal rings
15	2-spool position valves with spring end position in the main valve (spool symbols A, C, D, K, Z)
16	2-spool position valves with spring end position in the main valve (spool symbols B, Y)
17	3-spool position valves, spring-centered; 2-spool position valves with hydraulic end position in the main valve
18	3-spool position valve, pressure-centered
19	Locking pin

Size 32

Dimensions in mm


Required surface quality of the valve contact surface

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

1	Main valve
7	Height of the diversion plate with hydraulic actuation
10.4	machined valve contact surface; porting pattern according to ISO 4401-10-09-0-05
12	Name plate complete valve
13	Seal rings
15	2-spool position valves with spring end position in the main valve (spool symbols A, C, D, K, Z)
16	2-spool position valves with spring end position in the main valve (spool symbols B, Y)
17	3-spool position valves, spring-centered; 2-spool position valves with hydraulic end position in the main valve
18	3-spool position valve, pressure-centered
19	Locking pin

Subplates (separate order) with porting pattern according to ISO 4401 see data sheet 45100.

Valve mounting screws (separate order)

– NG10:

4 metric hexagon socket head cap screws

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

(friction coefficientμtotal = 0.09 to 0.14);

tightening torque M A = 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 torque MA = 75 Nm ± 10%,

material no. R913000116

2 metric hexagon socket head cap screws

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

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 12.5 Nm ± 10%,

material no. R913000115

4 hexagon socket head cap screws UNC3/8-16 UNC x 2 1/4″ ASTM-A574

on request

2 hexagon socket head cap screws UNC1/4-20 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 torque MA = 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 torqueMA = 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 is limited by the stroke setting (1). The control spool 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
	mm
10	6.5
16	10
25 (H-WH22)	9.5
25 (H-WH25)	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	Ordering code	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	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	11	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	12	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-spool position valve
			Spring end position						Hydraulic end position
			A, C, D, K, Z			B, Y			HC, HD, HK, HZ, HY
Mounting options	Ordering code	NG	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	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	11	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	12	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 "H-WH 22"
	2) Version "H-WH 25"

Spool position monitoring

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) 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) 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 4WEH 10 ..4X/…S

Type 4WEH 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 4WEH 10 ..4X/…/..D3

The pressure reducing valve (8) has to be used at a pilot pressure above 250 bar (with type 4WEH 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!

The stipulations of the Machinery Directive 2006/42/EC are to be adhered to! Please also note data sheet 08012 with information on MTTFd values and shock and vibration loads!

DIRECTIONAL SPOOL VALVE H-4WH 25 HQ6X/S2

Manufacturer: Bosch Rexroth

Material #: R978903745

Model : H-4WH 25 HQ6X/S2

More are expected on May 27, 2025

This product is eligible for factory repair.

Pilot oil supply (schematic illustration)

Pilot oil supply (schematic illustration)

Pilot oil supply (schematic illustration)

Pilot oil supply (schematic illustration)

Pilot oil supply (schematic illustration)

general

hydraulic

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

Inductive position switch type QM: electrical connection

electrical

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

NG10

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

NG10

NG10

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

NG16

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

NG16

NG16

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

NG25 (type W.H 22)

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

NG25 (type W.H 22)

NG25 (type W.H 22)

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

NG25 (type W.H 25)

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

NG25 (type W.H 25)

NG25 (type W.H 25)

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

Size 32

Size 32

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

Size 32

Size 32

2 spool positions

3 spool positions

Inductive position switch type QM Switching logics

Version QMA

Version QMA

Version QMB

Version QMB

version QMAB

Version QM0

Version QM0

Version QM0

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

Switching time adjustment

Type 4WEH 10 ..4X/…S

"D3” pressure reducing valve

Type 4WEH 10 ..4X/…/..D3

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