DIRECTIONAL SPOOL VALVE 4WH16HD7X/S2

Manufacturer: Bosch Rexroth

Material #: R978901781

Model : 4WH16HD7X/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 4WH16HD7X/S2 (R978901781) is a high-performance industrial hydraulic valve designed for reliable control of oil flow direction in hydraulic systems. This solenoid-actuated valve features a spool with symbol D and operates with external pilot oil supply and return. It is a pilot-operated spool valve that offers precise control over the start, stop, and direction of fluid flow within hydraulic circuits. The valve's construction includes a robust housing, main control spool, return springs for spring centering or spring return configurations, and a diversion plate for managing the pilot oil supply. The main control spool is actuated by pressurization and is held in its initial position by the return springs or pressurization. This design ensures stability and responsiveness in the valve's operation. For ease of integration into various systems, it features subplate mounting with connection diagrams compliant with NFPA T3.5.1 R2-2002 D03 and ISO 4401 porting patterns. The 4WH16HD7X/S2 provides flexibility with multiple switching positions to accommodate different system requirements. This directional valve is capable of handling pressures up to the maximum specified limit for its product group ID, ensuring it can operate under demanding conditions. Its NBR seals are compatible with a range of hydraulic fluids including HL, HLP, HLPD, HVLP, HVLPD, and HFC types. Additional functionalities include spring or pressure centering options as well as stroke setting and spool position monitoring for enhanced operational precision. The Bosch Rexroth 4WH16HD7X/S2 valve is available in sizes 6 to 32 (NG6 to NG32), accommodating various flow rates up to its maximum capacity while maintaining efficient performance across diverse industrial applications.

$1,273.00 USD

More are expected on April 21, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 21, 2025 when ordered in

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DIRECTIONAL SPOOL VALVE 4WH16HD7X/S2

Size 16, symbol D, electrical with solenoid

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

Unpacked Weight: 8.100 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 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 M12 x 1.5 according DIN 906, wrench size 6 - pilot oil supply
3	Plug screw M12 x 1.5 according DIN 906, wrench size 6 - pilot oil supply

Type 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 D
Max. pressure	280
Productgroup ID	9,10,11,12,13,14
Number of ports	4
Type of actuation	with hydraulic actuation
Size	16
Max. flow	300
Type of connection	Subplate mounting
Connection diagram NFPA	NFPA T3.5.1 R2-2002 D07
Size_CETOP	0
Connection diagram	ISO 4401-07-07-0-05
Number of switching positions	2
Weight	8.100
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
		WH					/						/			*

01	up to 280 bar	no code
02	3-way version	3
02	4-way version	4
Type of actuation
03	hydraulic	WH
Size
04	NG10	10
	NG16	16
	NG25 (version "WH 22")	22
	NG25 (version "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 ("WH 25") and NG32	6X
	Component series 70 … 79 (70 … 79: unchanged installation and connection dimension) – NG16 (from series 72) andNG25 ("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 (WH 22)	25 (WH 25)	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 (WH 22)	25 (WH 25)	32
Maximum operating pressure	Port P		bar	280
	Port A		bar	280
	Port B		bar	280
	Port T	External pilot oil return Y	bar	280	250
	Port Y	Pilot oil return, external	bar	250		210	250
Hydraulic fluid				see table
Hydraulic fluid temperature range	NBR seals 1)		°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			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)	2-spool position valve, hydraulic end position	bar	7	14	8		5
Minimum pilot pressure	Internal pilot oil supply X (with symbols C, F, G, H, P, T, V, Z, S)		bar	7.5 3)	4.5 4) 5)	4.5 5)
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 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.
3)	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.
4)	Spool S only for NG16
5)	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)

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

Size			10	16	25 (WH 22)	25 (WH 25)	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	7	–	5	7
R	1 1	2	3	–
U	2	2	3	6	–	6	–
A, B	1	1 1	–	–

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	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	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

7	Spool type G	Central position P – T
8	Spool type T	Central position P – T

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

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

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

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

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

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 WH (hydraulic)
A1), C, D, K, Z	../..
A1), C, D, K, Z	..H../..
B1), Y	../..

1)	Only for NG10 and 25 ("4W.H 22") with 3/2-way version; if operating pressure > tank pressure, port T is to be used as aleakage port!

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 WH (hydraulic)
E, F, G, H, J, L, M, P, Q, R, S, T, U, V, W		../..
E, F, G, H, J, L, M, P, 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
11	Name plate pilot control valve
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 valves, pressure-centered
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 hexagon socket head cap screws, metric

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

(Friction coefficientμtotal = 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

upon request

– NG16:

4 hexagon socket head cap screws, metric

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 hexagon socket head cap screws, metric

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 UNC 3/8-16 UNC x 2 1/4″ ASTM-A574

upon request

2 hexagon socket head cap screws UNC 1/4-20 UNC x 1/4″ ASTM-A574

upon request

– NG25:

6 hexagon socket head cap screws, metric

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

upon request

– NG32:

6 hexagon socket head cap screws, metric

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

upon 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 (WH 22)	9.5
25 (WH 25)	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 "W.H 22"
	2) Version "W.H 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.

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 4WH16HD7X/S2

Manufacturer: Bosch Rexroth

Material #: R978901781

Model : 4WH16HD7X/S2

More are expected on April 21, 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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