4WEH 22 G7X/6EG12N9EDA/B08

Manufacturer: Bosch Rexroth

Material #: R978912221

Model : 4WEH 22 G7X/6EG12N9EDA/B08

***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 4WEH 22 G7X/6EG12N9EDA/B08 (R978912221) is a high-performance directional spool valve designed for electrohydraulic actuation, intended for subplate mounting with porting patterns that comply with ISO standards. This valve is adept at controlling the start, stop, and direction of fluid flow within hydraulic systems. The main valve comprises a housing, control spool, return springs, and a pilot control valve equipped with solenoids. The control spool's position is maintained by the return springs or through pressurization. This particular model offers flexibility in operation with options for spring or pressure centering and can have spring end positioning or hydraulic end positioning. The actuation can be either internal or external pilot control and features wet-pin DC or AC solenoids. Users also have the option to choose between individual or central electrical connections. Additional customization features include manual override capabilities, switching time adjustments, a preload valve in channel P of the main valve as well as options for stroke setting and/or spool position monitoring. It is available in sizes 10 to 35 (WEH10 to WEH35) and can handle maximum operating pressures of up to 350 bar and maximum flow rates reaching up to 450 liters per minute. The Bosch Rexroth 4WEH series valves are versatile components suitable for various applications requiring precise flow direction control in hydraulic systems. These valves are designed with durability in mind but do possess inherent internal leakage by design which may increase over their lifecycle. Users should note that any modifications related to pilot oil supply should only be carried out by authorized specialists or directly at the factory to ensure proper functioning and safety standards are maintained.

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Types of actuation (internal or external pilot control): Electro-hydraulic (type WEH) 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 Wet-pin DC or AC solenoids, optional Electrical connection as individual or central connection Optional versions:
- Manual override
- Switching time adjustment
- Preload valve in channel P of the main valve
- Stroke setting and/or spool position monitoring

Directional valves type WEH…

The valve type WEH is a directional spool valve with electro-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) with one or two solenoids "a" (5.1) and/or "b" (5.2). 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 (6) and (8) are connected with the tank in a depressurized form via the pilot control valve (4). Via the control line (7), the pilot control valve is supplied with pilot oil. Supply can be implemented internally or externally (externally via port X). Upon actuation of the pilot control valve, e.g. solenoid "a", the pilot control spool (10) is moved to the left and thus, the spring chamber (8) is pressurized with pilot pressure. The spring chamber (6) 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. On switching off of solenoid, the pilot control spool (10) returns to its initial position (except impulse spool). The spring chamber (8) is unloaded to the tank. The pilot oil return is implemented internally (via channel T) or externally (via channel Y). An optional manual override (9) allows for moving of the pilot control spool (10) without solenoid energization.

Notices:

The return springs (3.1) and (3.2) in the spring chambers (6) and (8) hold the main control spool (2) in central position without pilot pressure even with, for example, vertical valve positioning.

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

4/3 directional valve with pressure centering of the main control spool, type WEH…H

The main control spool (2) in the main valve is kept in the zero position by pressurization of the two front faces. One centering bush (12) rests on the housing and fixes the control spool position. By pressure relief of one front face, the main control spool (2) is moved to the switching position. The unloaded control spool face displaces the returning pilot oil into channel Y (external) via the pilot control valve.

Notes:

The springs (3.1) and (3.2) do not have a return function in this version. They hold the main control spool (2) in central position in the depressurized condition and with horizontal installation.

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 closed	External	1 closed
Internal	2 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 WEH...

The pilot oil supply is implemented externally - via channel X - from a separate pressure supply.

The pilot oil return is implemented externally - via the Y channel - into the tank.

Type WEH…E…

The pilot oil supply is implemented internally from channel P of the main valve. (see Technical data)

The pilot oil return is implemented externally - via channel Y - into the tank. In the subplate, port X is closed.

Type WEH...ET...

The pilot oil supply is implemented internally from channel P of the main valve.

The pilot oil return is implemented internally via the channel T - into the tank. In the subplate, ports X and Y are closed.

Type WEH...T...

The pilot oil supply is implemented externally - via channel X - from a separate pressure supply.

The pilot oil return is implemented internally - via the channel T - into the tank. In the subplate, port Y is closed.

Throttle insert

Use of the throttle insert (5) is necessary if the pilot oil supply in channel P of the pilot control valve is to be limited (see below). The throttle insert (5) is inserted in channel P of the pilot control valve.

Notices:

The modification of the pilot oil supply may only be performed by authorized specialists or at the factory!

Pilot oil supply X or return Y external: The maximum admissible operating parameters of the pilot control valve must be observed (see data sheet 23178)! Maximum pilot pressure: please observe the Technical data! Pilot oil supply internal (version "ET" and "E"): Minimum pilot pressure: please observe the Technical data! In order to prevent inadmissibly high pressure peaks, a "B10" throttleinsert has to be provided in port P of the pilot control valve. In connection with version "H", the pressure reducing valve "D3" (see switching time adjustment) is also required.

3	Pilot control valve
4	Main valve
5	Throttle insert

01	02	03	04	05	06	07		08	09	10	11	12	13	14	15		16	17	18	19	20	21	22
		WEH					/								K4	/							*

01	up to 280 bar	no code
02	3-way version	3
02	4-way version	4
Types of actuation
03	electro-hydraulic	WEH
Size
04	NG10	10
	NG16	16
	NG25 (version "WEH 22")	22
	NG25 (version "WEH 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 ("WEH 25") and NG32	6X
	Component series 70 … 79 (70 … 79: unchanged installation and connection dimension) – NG16 (from series 72) andNG25 ("WEH 22")	7X
Control spool return in the pilot control valve with 2 spool positions and 2 solenoids (only possible with symbols C, D, K, Z and hydraulic control spool return in the main valve)
08	With spring return	no code
	Without spring return	O
	Without spring return with detent 2)	OF
Pilot control valve 2)
09	High-power valve	6E
10	Direct voltage 24 V 2)	G24
	Alternating voltage 230 V, 50/60 Hz 2)	W230
	For other voltages, frequencies and electric data, see data sheet of high-power valve
11	Without manual override	no code
	With manual override	N
	With concealed manual override	N9
Pilot oil flow
12	External pilot oil supply, external pilot oil return 3)	no code
	Internal pilot oil supply, external pilot oil return 3; 4)	E
	Pilot oil supply internal, pilot oil return internal 4)	ET
	External pilot oil supply, internal pilot oil return 3)	T
	version “ET” and “T” with 3-spool position valve, pressure-centered, only possible if ppilot ≥ 2 x ptank + ppilot min!)
Switching time adjustment
13	without switching time adjustment	no code
	Switching time adjustment as supply control	S
	Switching time adjustment as discharge control	S2
Corrosion resistance
14	None (valve housing primed)	no code
14	Improved corrosion protection (240 h salt spray test according to EN ISO 9227)	J3
Electrical connection 2)
15	Individual connection
	Without mating connector; connector DIN EN 175301-803	K4 6)
	For further electrical connections, see data sheet 23178 and 08010
Spool position monitoring
16	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
17	For ordering code, see stroke setting
Throttle insert 2)
18	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) 2)
19	without preload valve	no code
19	with preload valve (pö = 4.5 bar)	P4,5
20	without pressure reducing valve	no code
20	with pressure reducing valve	D3 5)
Seal material
21	NBR seals	no code
	FKM seals	V
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
22	Further details in the plain text	*

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

	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) Only with electro-hydraulic actuation (type WEH)
	3) Pilot oil supply X or return Y external:
	- The maximum admissible operating parameters of the pilot control valve must be observed (see data sheet 23178)!
	- Minimum pilot pressure: please see technical data!
	- Maximum pilot pressure: please see technical data!
	4) Pilot oil supply internal (version "ET" and "E"):
	- Minimum pilot pressure: please see technical data!
	- Maximum pilot pressure: please see technical data!
	With a higher pilot pressure, use of a pressure reducing valve "D3" is required (if it is not used pilot pressure = operating pressure at the port!).
	- In order to prevent inadmissibly high pressure peaks, a "B10" throttle insert has to be provided in port P of the pilot control valve (see Pilot oil supply).
	- In connection with version "H", the pressure reducing valve "D3" is also required.
	5) Only in connection with the "B10" throttle insert
	6) Mating connectors, separate order, see data sheet 23178

general

Size			10	16	25 (WEH22)	25 (WEH25)	32
Weight (approx.)	Valve with one solenoid	kg	6.4	8.5	11.5	17.6
	Valve with two solenoids, spring-centered	kg	6.8	8.9	11.9	19	41
	Valve with two solenoids, pressure-centered	kg	6.8	8.9	11.9	19	41
	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	100

hydraulic

Size				10	16	25 (WEH22)	25 (WEH25)	32
Maximum operating pressure	Port P		bar	280
	Anschluss A		bar	280
	Port B		bar	280
	Port T	External pilot oil return Y	bar	280	250
		Internal pilot oil return Y (with direct voltage) 1)	bar	210
		Internal pilot oil return Y (with alternating voltage) 1)	bar	160
	Port Y	Pilot oil return, external (with direct voltage)	bar	210
	Port Y	Pilot oil return, external (with alternating voltage)	bar	160
Hydraulic fluid				see table
Hydraulic fluid temperature range	NBR seals 2)		°C	-20 … +80
	FKM seals 2)		°C	-15 … +80
	HFC hydraulic fluid		°C	-20 … +50
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	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	10.5	13	8.5
		3-spool position valve, pressure-centered	bar	-	14	-	18	8.5
		2-spool position valve, spring end position	bar	10	14	11	13	10
		2-spool position valve, hydraulic end position	bar	7	14	8		5
	Internal pilot oil supply X (with symbols C, F, G, H, P, T, V, Z, S) 6)		bar	7.5 5)	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		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	-	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)	If type WH is used in potentially explosion-proof areas, see data sheet 07011.
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 "D3" is required (if it is not used pilot pressure = operating pressure at the port).- In connection with version "H", the pressure reducing valve "D3" is also required.
5)	For symbols C, F, G, H, P, T, V, Z, an internal pilot oil supply is only possible if the flow from P to T in the central position (for 3-spool position valve) or while crossing the central position (for2-spool position valve) is so large that the pressure differential of P to T reaches a value of at least 7,5 bar and the pilot oilreturn Y is implemented externally.
6)	Symbol S only for NG16
7)	For symbols C, F, G, J, H, P, T, V, Z, S 5) – by means of preload valve (not NG10) or correspondingly high flow. (Determination ofthe required flow, see "Preload valve" characteristic curves.) For NG10, a check valve with a cracking pressure of 7,5 bar is to be provided in the return line to the tank.The pilot oil return Y must be implemented externally.

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

Size			10	16	25 (WEH22)	25 (WEH25)	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. Flame-resistant – containing water: Maximum pressure differential per control edge 50 bar Pressure pre-loading at the tank port >20% of the pressure differential, otherwise increased cavitation erosion Life cycle as compared to operation with mineral oil HL, HLP 30 ... 100% 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).

Switching times
Pilot pressure		bar	70	210	250	Spring
Pilot pressure		bar	ON			OFF
NG10	Without throttle insert	ms	40 ... 60	–	40 ... 60	20 ... 30
NG10	With throttle insert	ms	60 ... 90	–	50 ... 70	20 ... 30
NG16	Without throttle insert	ms	50 ... 80	–	40 ... 60	50 ... 80
NG16	With throttle insert	ms	110 ... 130	–	80 ... 100	50 ... 80
NG25 (WEH 22)	Without throttle insert	ms	40 ... 70	40 ... 60	–	50 ... 70
NG25 (WEH 22)	With throttle insert	ms	140 ... 160	80 ... 110	–	50 ... 70
NG25 (WEH 25)	Without throttle insert	ms	70 ... 100	–	50 ... 70	100 ... 130
NG25 (WEH 25)	With throttle insert	ms	200 ... 250	–	120 ... 150	100 ... 130
NG32	Without throttle insert	ms	80 ... 130	–	70 ... 100	140 ... 160
NG32	With throttle insert	ms	420 ... 560	–	230 ... 350	140 ... 160

Notices!

Switching times = Contacting at the pilot control valve until start of opening of the control edge in the main valve and change in the control spool stroke by 95%) The switching times are measured according to ISO 6403 with HLP46, ϑOil = 40 °C ±5 °C). With different oil temperatures, variations are possible! The switching times were determined using DC solenoids. They decrease by approx. 20 ms if AC solenoids are used. The shut-off of the solenoids creates voltage peaks, which can be reduced by the use of suitable diodes. The switching times increase by approx. 30 ms if the pressure reducing valve "D3" is used. The switching times have been determined under ideal conditions and may differ in the system, depending on the application conditions.

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

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	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.

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

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.

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 the symbols C, Z and HC, HZ. 4/3 directional valves with pressure centering of the control spool in the main valve can be used above the indicated performance limit. In this case, a higher pilot pressure is required (values see performance limits of the corresponding size). With pilot oil supply X internal, sufficient flow needs to be ensured due to the negative overlap of symbols F, G, H, P, S 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).
NG25 („WEH 22“)	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).
NG25 („WEH 25“)	With pilot oil supply X internal, a preload valve has to be used for flows < 180 l/min due to the negative overlap of symbols Z, HZ and V. 4/3 directional valves with pressure centering of the control spool in the main valve can be used above the indicated performance limit. In this case, a higher pilot pressure is required (values see performance limits of the corresponding size). 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 symbols Z, HZ and V. 4/3 directional valves with pressure centering of the control spool in the main valve can be used above the indicated performance limit. In this case, a higher pilot pressure is required (values see performance limits of the corresponding size). 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).

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	2	3	–
U	2	2	3	6	–	6	–
A, B	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.

2 spool positions

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

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

1)	Only for NG10 and 25 ("WEH 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 WEH (electro-hydraulic)
E, F, G, H, J, L, M, P, Q, R, S, T, U, V, W		../..
	.A
	.B
		..H../..
		H.A
		H.B

Symbols for valves with 2 spool positions

Symbols for valves with 3 spool positions

Notice:

3-spool position valves, pressure-centered, preferably with external pilot oil supply and/or return ("no code", "E") For preconditions for internal pilot oil supply and/or return ("ET", "T"), see Symbols and Technical data

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
2	Pilot control valve type 4WE 6... according to data sheet 23208:
2.1	Pilot control valve type 4WE 6 D… (1 solenoid) for main valves with symbols C, D, K, Z Symbols HC, HD, HK, HZ Pilot control valve type 4WE 6 JA... (1 solenoid “a”) for main valves with symbols EA, FA, etc., spring return Pilot control valve type 4WE 6 MA... (1 solenoid “a”) for main valves with symbols HEA, HFA, etc., hydraulic control spool return
2.2	Pilot control valve type 4WE 6 Y... (1 solenoid) for main valves with symbol Y symbol HY Pilot control valve type 4WE 6 JB... (1 solenoid “b”) for main valves with symbol EB, FB, etc., spring return Pilot control valve type 4WE 6 MB... (1 solenoid “b”) for main valves with symbol HEB, HFB, etc., hydraulic control spool return
2.3	Pilot control valve type 4WE 6J… (2 solenoids) for main valves with 3 spool positions, spring-centered Pilot control valve type 4WE 6 M… (2 solenoids) for main valves with 3 spool positions, pressure-centered
3.1	Solenoid “a”
3.2	Solenoid “b”
4	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). When the manual override is blocked, the operation of the solenoid must be prevented! The simultaneous actuation of the solenoids must be prevented!
5	Solenoid without manual override
6	Solenoid with manual override
8	Switching time adjustment (wrench size 6), optional
9	Pressure reducing valve, optional
10.1	Machined valve contact surface; porting pattern according to ISO 4401-05-05-0-05
11	Name plate pilot control valve
12	Name plate complete valve
13	Seal rings
14	Space required to remove the mating connector

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
2	Pilot control valve type 4WE 6... according to data sheet 23208:
2.1	Pilot control valve type 4WE 6 D… (1 solenoid) for main valves with symbols C, D, K, Z Symbols HC, HD, HK, HZ Pilot control valve type 4WE 6 JA... (1 solenoid “a”) for main valves with symbols EA, FA, etc., spring return Pilot control valve type 4WE 6 MA... (1 solenoid “a”) for main valves with symbols HEA, HFA, etc., hydraulic control spool return
2.2	Pilot control valve type 4WE 6 Y... (1 solenoid) for main valves with symbol Y symbol HY Pilot control valve type 4WE 6 JB... (1 solenoid “b”) for main valves with symbol EB, FB, etc., spring return Pilot control valve type 4WE 6 MB... (1 solenoid “b”) for main valves with symbol HEB, HFB, etc., hydraulic control spool return
2.3	Pilot control valve type 4WE 6J… (2 solenoids) for main valves with 3 spool positions, spring-centered Pilot control valve type 4WE 6 M… (2 solenoids) for main valves with 3 spool positions, pressure-centered
3.1	Solenoid “a”
3.2	Solenoid “b”
4	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). When the manual override is blocked, the operation of the solenoid must be prevented! The simultaneous actuation of the solenoids must be prevented!
5	Solenoid without manual override
6	Solenoid with manual override
8	Switching time adjustment (wrench size 6), optional
9	Pressure reducing valve, optional
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
14	Space required to remove the mating connector
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
2	Pilot control valve type 4WE 6... according to data sheet 23208:
2.1	Pilot control valve type 4WE 6 D… (1 solenoid) for main valves with symbols C, D, K, Z Symbols HC, HD, HK, HZ Pilot control valve type 4WE 6 JA... (1 solenoid “a”) for main valves with symbols EA, FA, etc., spring return Pilot control valve type 4WE 6 MA... (1 solenoid “a”) for main valves with symbols HEA, HFA, etc., hydraulic control spool return
2.2	Pilot control valve type 4WE 6 Y... (1 solenoid) for main valves with symbol Y symbol HY Pilot control valve type 4WE 6 JB... (1 solenoid “b”) for main valves with symbol EB, FB, etc., spring return Pilot control valve type 4WE 6 MB... (1 solenoid “b”) for main valves with symbol HEB, HFB, etc., hydraulic control spool return
2.3	Pilot control valve type 4WE 6J… (2 solenoids) for main valves with 3 spool positions, spring-centered Pilot control valve type 4WE 6 M… (2 solenoids) for main valves with 3 spool positions, pressure-centered
3.1	Solenoid “a”
3.2	Solenoid “b”
4	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). When the manual override is blocked, the operation of the solenoid must be prevented! The simultaneous actuation of the solenoids must be prevented!
5	Solenoid without manual override
6	Solenoid with manual override
8	Switching time adjustment (wrench size 6), optional
9	Pressure reducing valve, optional
10.3	machined valve contact surface; porting pattern according to ISO 4401-08-08-0-05
11	Name plate pilot control valve
12	Name plate complete valve
13	Seal rings
14	Space required to remove the mating connector
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
2	Pilot control valve type 4WE 6... according to data sheet 23208:
2.1	Pilot control valve type 4WE 6 D… (1 solenoid) for main valves with symbols C, D, K, Z Symbols HC, HD, HK, HZ Pilot control valve type 4WE 6 JA... (1 solenoid “a”) for main valves with symbols EA, FA, etc., spring return Pilot control valve type 4WE 6 MA... (1 solenoid “a”) for main valves with symbols HEA, HFA, etc., hydraulic control spool return
2.2	Pilot control valve type 4WE 6 Y... (1 solenoid) for main valves with symbol Y symbol HY Pilot control valve type 4WE 6 JB... (1 solenoid “b”) for main valves with symbol EB, FB, etc., spring return Pilot control valve type 4WE 6 MB... (1 solenoid “b”) for main valves with symbol HEB, HFB, etc., hydraulic control spool return
2.3	Pilot control valve type 4WE 6J… (2 solenoids) for main valves with 3 spool positions, spring-centered Pilot control valve type 4WE 6 M… (2 solenoids) for main valves with 3 spool positions, pressure-centered
3.1	Solenoid “a”
3.2	Solenoid “b”
4	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). When the manual override is blocked, the operation of the solenoid must be prevented! The simultaneous actuation of the solenoids must be prevented!
5	Solenoid without manual override
6	Solenoid with manual override
8	Switching time adjustment (wrench size 6), optional
9	Pressure reducing valve, optional
10.3	machined valve contact surface; porting pattern according to ISO 4401-08-08-0-05
11	Name plate pilot control valve
12	Name plate complete valve
13	Seal rings
14	Space required to remove the mating connector
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
2	Pilot control valve type 4WE 6... according to data sheet 23208:
2.1	Pilot control valve type 4WE 6 D… (1 solenoid) for main valves with symbols C, D, K, Z Symbols HC, HD, HK, HZ Pilot control valve type 4WE 6 JA... (1 solenoid “a”) for main valves with symbols EA, FA, etc., spring return Pilot control valve type 4WE 6 MA... (1 solenoid “a”) for main valves with symbols HEA, HFA, etc., hydraulic control spool return
2.2	Pilot control valve type 4WE 6 Y... (1 solenoid) for main valves with symbol Y symbol HY Pilot control valve type 4WE 6 JB... (1 solenoid “b”) for main valves with symbol EB, FB, etc., spring return Pilot control valve type 4WE 6 MB... (1 solenoid “b”) for main valves with symbol HEB, HFB, etc., hydraulic control spool return
2.3	Pilot control valve type 4WE 6J… (2 solenoids) for main valves with 3 spool positions, spring-centered Pilot control valve type 4WE 6 M… (2 solenoids) for main valves with 3 spool positions, pressure-centered
3.1	Solenoid “a”
3.2	Solenoid “b”
4	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). When the manual override is blocked, the operation of the solenoid must be prevented! The simultaneous actuation of the solenoids must be prevented!
5	Solenoid without manual override
6	Solenoid with manual override
8	Switching time adjustment (wrench size 6), optional
9	Pressure reducing valve, optional
10.4	machined valve contact surface; porting pattern according to ISO 4401-10-09-0-05
11	Name plate pilot control valve
12	Name plate complete valve
13	Seal rings
14	Space required to remove the mating connector
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
NG	mm
10	6.5
16	10
25 (WEH22)	9.5
25 (WEH25)	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 spool symbol A only version “11”, with spool symbol B only version “12” possible.
	2) Type WEH 22...
	3) Type 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) With spool symbol A only version “11”, with spool symbol B only version “12” possible.
	2) Type WEH 22...
	3) Type WEH 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, HY				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)	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

Mounting options – 2-spool position valve

Monitored spool position	Ordering code	Size	Hydraulic end position HC, HD, HK, HZ, HY
Monitored spool position	Ordering code	Size	L2 1)	L3
			mm	mm
“a” position switch on side B	QMAG24	25	294	47

1)	Without mating connector

Mounting options – 2-spool position valve

Monitored spool position	Ordering code	Size	Spring end position C, D, K, Z
Monitored spool position	Ordering code	Size	L2 1)	L3
			mm	mm
“a” position switch on side B	QMAG24	25	294	47

1)	Without mating connector

Mounting options – 2-spool position valve

Monitored spool position	Ordering code	Size	Spring end position Y
Monitored spool position	Ordering code	Size	L2 1)	L3
			mm	mm
“a” position switch on side B	QMAG24	25	294	47

1)	Without mating connector

Mounting options – 2-spool position valve

Monitored spool position	Ordering code	Size	Hydraulic end position HC, HD, HK, HZ, HY
Monitored spool position	Ordering code	Size	L1 1)	L3
			mm	mm
“b” position switch on side A	QMBG24	25	149	192

1)	Without mating connector

Mounting options – 2-spool position valve

Monitored spool position	Ordering code	Size	Spring end position C, D, K, Z
Monitored spool position	Ordering code	Size	L1 1)	L4
			mm	mm
“b” position switch on side A	QMBG24	25	149	192

1)	Without mating connector

Mounting options – 2-spool position valve

Monitored spool position	Ordering code	Size	Spring end position Y
Monitored spool position	Ordering code	Size	L1 1)	L4
			mm	mm
“b” position switch on side A	QMBG24	25	149	192

1)	Without mating connector

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 WEH 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.

Notice:

Series-production status, see ordering key on the name plate.

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

Size	Material number P4,5
Size	Item 9.2	Item 9.1
16	R961009417 (up to component series 71)	R961009415 (from component series 72)
25 („W.H 22“)	R961009609 (up to component series 76)	-
25 („W.H 25“)	R961009416 (up to component series 67)	R961009166 (from component series 68)
32	R961009610 (up to component series 63)	-

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

1	NG16
2	NG25 (type 4W.H 25 …)
3	NG25 (type 4W.H 22 …)
4	NG32

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!