Directional spool valves, pilot operated, with hydraulic or electro-hydraulic actuation WH, WEH

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Артикул: RX7418

Directional spool valves, pilot operated, with hydraulic or electro-hydraulic actuation WH, WEH

Name: Directional spool valves, pilot operated, with hydraulic or electro-hydraulic actuation WH, WEH
Brand: Bosch Rexroth
SKU: RX7418
Price: 2850 RUB
Availability: InStock

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Description

Size 10 … 32
Component series 4X, 7X, 6X
Maximum operating pressure 350 bar
Maximum flow 1100 l/min

Features

4/3-, 4/2- or 3/2-way version
Types of actuation (internal or external pilot control):
– Electro-hydraulic (type WEH)
– Hydraulic (type WH)
For subplate mounting
Porting pattern according to ISO 4401
Spring or pressure centering, spring end position or hydraulic end position
Wet-pin DC or AC solenoids, optional
Electric connection as single 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

Product description

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).

For unobjectionable functioning, the hydraulic system has to be bled properly.

For valves with 3 spool positions, the main control spool (2) in the main valve is held in zero position or initial position by means of two springs, for valves with 2 spool positions by pressurization and spring. 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.

Notice:

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.

Type WH

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). Via the diversion plate (11), the spring chamber (6) is connected to port Y, the spring chamber (8) to port X.

With pilot pressure loading of one of the two front sides of the main control spool (2), the spool is moved to the spool 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.

Type WEH…H

4/3 directional valve with pressure centering of the main control spool

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 spool position.

The unloaded control spool face displaces the returning pilot oil into channel Y (external) via the pilot control valve.

Notice:

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)

Size 10

NG16

NG25 („W.H 22“)

NG25 („W.H 25“)

Size 32

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

Pilot oil supply

Pilot oil return

External

2, 3

closed

External

closed

Internal

2, 3

open

Internal

open

Type WH…

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

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 the Y channel 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. The throttle insert (5) is inserted in channel P of the pilot control valve.

4	Pilot control valve
5	Main valve
6	Throttle insert

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.

Type code

01	Up to 280 bar	no code
01	Up to 350 bar	H-
Main ports
02	3-way version	3
02	4-way version	4
Type of actuation
03	Hydraulic	WH
03	Electro-hydraulic	WEH
Size
04	NG10	10
	NG16	16
	NG25 (version "W.H 22")	22
	NG25 (version "W.H 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"
Component series
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 ("W.H 25") and NG32	6X
	Component series 70 … 79 (70 … 79: unchanged installation and connection dimension) – NG16 (from series 72) andNG25 ("W.H 22")	7X
Control spool return in the pilot control valve with 2 spool positions and 2 solenoids (only possible with symbols A, B, 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 (data sheet 23178)	6E
Electrical voltages 2)
10	Direct voltage 24 V	G24
10	Alternating voltage 230 V, 50/60 Hz	W230
Manual override
11	Without manual override	no code
	With manual override	N
	With concealed manual override	N9
Corrosion resistance (outside)
12	None (valve housing primed)	no code
12	Improved corrosion protection (240 h salt spray test according to EN ISO 9227)	J3
Pilot oil flow 3)
13	External pilot oil supply, external pilot oil return 4)	no code
	Internal pilot oil supply, external pilot oil return 4; 5)	E
	Pilot oil supply internal, pilot oil return internal 5)	ET
	External pilot oil supply, internal pilot oil return 4)	T
Switching time adjustment
14	Without switching time adjustment	no code
	Switching time adjustment as supply control	S
	Switching time adjustment as discharge control	S2
Electrical connection 2)
15	Individual connection
15	Without mating connector, connector according to DIN EN 175301-803	K4 6)
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	Stroke setting on valve side A and B	10
	Stroke setting on valve side A	11
	Stroke setting on valve side B	12
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 pre-decompression	no code
19	With preload valve	P4,5
20	Without pressure reducing valve	no code
20	With pressure reducing valve	D3 7)
Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")
21	NBR seals	no code
21	FKM seals	V
22	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)	Only with electro-hydraulic actuation (type WEH)
3)	For type WH... only "no code"; version "ET" and "T" with 3-spool position valve, pressure-centered only possible if ppilot ≥ 2 x ptank + ppilot min
4)	Pilot oil supply X or return Y external: – Minimum pilot pressure: please observe "Technical data". – Maximum pilot pressure: please observe "Technical data". – The maximum admissible operating parameters of the pilot control valve must be observed (see data sheet 23178).
5)	Pilot oil supply internal (version "ET" and "E"): – Minimum pilot pressure: please observe "Technical data". – Maximum pilot pressure: please observe "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 "Product description"). – In connection with version "H", the pressure reducing valve "D3" is also required.
6)	Mating connectors, separate order, see "Accessories"
7)	Only in connection with the "B10" throttle insert

Technical data

general

Type			WH	H-WH	WEH	H-WEH	WH	H-WH	WEH	H-WEH	WH22	H-WH22	WEH22	H-WEH22	WH25	H-WH25	WEH25	H-WEH25	WH	H-WH	WEH	H-WEH
Size			10				16				25								32
Weight (approx.)	Valve with one solenoid	kg			6.4				8.5				11.5				17.6				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
	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			With suspended installation, higher sensitivity to contamination, horizontal is recommended. For valves with hydraulic control spool return "H" and symbol C, D, K, Z, Y, horizontal is required.
Ambient temperature range	NBR seals	°C	-20 … +50
	FKM seals	°C	-15 … +50
	Version for HFC hydraulic fluid	°C	-20 … +50
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		100		150		100		150		100		150		100		150		100

hydraulic

Type				WH	H-WH	WEH	H-WEH	WH	H-WH	WEH	H-WEH	WH22	H-WH22	WEH22	H-WEH22	WH25	H-WH25	WEH25	H-WEH25	WH	H-WH	WEH	H-WEH
Size				10				16				25								32
Maximum operating pressure	Port P		bar	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350
	Anschluss A		bar	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350
	Port B		bar	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350	280	350
	Port T	External pilot oil return Y	bar	280	315	280	315	250
		Internal pilot oil return Y (direct voltage)	bar	-		210 1)		-		210 1)		-		210 1)		-		210 1)		-		210 1)
		Internal pilot oil return Y (alternating voltage)	bar	-		160 1)		-		160 1)		-		160 1)		-		160 1)		-		160 1)
	Port Y	Pilot oil return, external	bar	250		-		250		-		210		-		250		-		250		-
		Pilot oil return, external (direct voltage)	bar	-		210		-		210		-		210		-		210		-		210
		Pilot oil return, external (alternating voltage)	bar	-		160		-		160		-		160		-		160		-		160
Hydraulic fluid				see table "Hydraulic fluid"
Hydraulic fluid temperature range	NBR seals		°C	-20 … +80 2)
	FKM seals		°C	-15 … +80 2)
	HFC hydraulic fluid		°C	-20 … +50 2)
Viscosity range			mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c)				Class 20/18/15 3)
Maximum pilot pressure			bar	250 4)								210 4)				250 4)
Minimum pilot pressure	External pilot oil supply X (all symbols), internal pilot oil supply (only symbols D, K, E, J, L, M, Q, R, U, W)	3-spool position valve, spring-centered	bar	12				14				10.5	12.5	10.5	12.5	13				8.5
		3-spool position valve, pressure-centered	bar	-				16				-				18				8.5
		2-spool position valve, spring end position	bar	10				14				11	14	11	14	13				10
		2-spool position valve, hydraulic end position	bar	7		-		14		-		8		-		8		-		5		-
	Internal pilot oil supply X (with symbols C, F, G, H, P, T, V, Z, S)		bar	-		7.5 5)		-		4.5 6)		-		4.5 6)		-		4.5 6)		-		4.5 6)
Free flow cross-sections in zero position with symbols Q, V and W	Symbol Q	A – T; B – T	mm²	13				32				78				83				78
	Symbol V	P – A; P – B	mm²	13				32				73				83				73
	Symbol V	A – T; B – T	mm²	13				32				84				83				84
	Symbol W	A – T; B – T	mm²	2.4				6				10				14				20
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		2.9		-				14.18		7		29.4		15.1
		from zero position in switching position “b”	cm³	-				5.72				-				14.18		14.15		29.4
		from switching position “b” in zero position	cm³	-				8.55		2.83		-				19.88		5.73		43.8		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)	Pilot oil supply internal: – 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. Pilot oil supply external: – Compliance with the maximum pilot pressure must be ensured by appropriate measures (e.g. protection of the separate pilot oil circuit by using a pressure relief valve).
5)	For symbols C, F, G, H, P, T, V, Z, an internal pilot oil supply is only possible if the flow from P to 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 to T reaches a value of at least 7.5 bar. For a pressure differential below 7.5 bar, a check valve with a cracking pressure of 7.5 bar is to be provided in the return line to the tank. An external pilot oil supply Y is required.
6)	Pilot oil supply X internal is only possible for a pressure at P of minimum 4.5 bar. For symbols with negative overlap F, G, H, P, T, V, (S only NG16), a certain flow from P to T in the central position is necessary for this purpose (see "characteristic curves"). For symbols C, HC, Z, HZ, a flow of >160 l/min is required during passing over the central position for NG16, for NG22, 25 and 32 a flow of >180 l/min. If the required flows are not reached, a preload valve has to be used. When using a preload valve, the pressure differential of the preload valve of the corresponding size (see "Project planning information") is to be added to the corresponding pressure differential in case of direction of flow P ("see characteristic curves").

Hydraulic fluid		Classification	Suitable sealing materials	Standards	Data sheet
Mineral oils		HL, HLP, HLPD, HVLP, HVLPD	NBR, FKM	DIN 51524	90220
Bio-degradable	Insoluble in water	HETG	NBR, 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
		HFDU (ester base)	FKM
		HFDR	FKM
	Containing water	HFC (Fuchs: Hydrotherm 46M, Renosafe 500; Petrofer: Ultra Safe 620; Houghton: Safe 620; Union: Carbide HP5046)	NBR	ISO 12922	90223
Important information on hydraulic fluids: For more information and data on the use of other hydraulicfluids, 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 surface temperature. Bio-degradable and flame-resistant – containing water: If components with galvanic zinc coating (e.g. version "J3" or "J5") or parts containing zinc are used, small amounts of dissolved zinc may get into the hydraulic system and cause accelerated aging of the hydraulic fluid. Zinc soap may form as a chemical reaction product, which may clog filters, nozzles and solenoid valves - particularly in connection with local heat input. Flame-resistant – containing water: Due to increased cavitation tendency with HFC hydraulic fluids, the life cycle of the component may be reduced by up to 30% as compared to the use with mineral oil HLP. In order to reduce the cavitation effect, it is recommended - if possible specific to the installation - to back up the return flow pressure in ports T to approx. 20% of the pressure differential at the component. Dependent on the hydraulic fluid used, the maximum ambient and hydraulic fluid temperature must not exceed 50 °C. In order to reduce the heat input into the component, a maximum duty cycle of 50% in continuous operation has to be set for on/off valves (measuring period 300 s). If this is not possible due to the function, an energy-reducing control of these components is recommended, e.g. via a PWM plug-in amplifier.

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 solenoid 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 were determined under ideal conditions and may differ in the system, depending on the application conditions.

(For applications outside these values, please consult us!)

Diagrams/characteristic curves

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

Size 10

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	2	3	–	–	–	–
U	2	2	3	6	–	6	–
A, B	2	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

2-spool position valve – qV max in l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring end position in the main valve 1) (at minimum pilot pressure of 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 pilot pressure fails, the function of the return spring is no longer guaranteed with the specified flow values.

Performance limits

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

Size 16

Δp-qV characteristic curves

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

Performance limits

2-spool position valve – qV max in l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring end position in the main valve 1) (at minimum pilot pressure of 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.

Performance limits

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.

Size 25 ("W.H 22")

Δp-qV characteristic curves

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

Performance limits

2-spool position valve – qV max in l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring end position in the main valve 1) (at minimum pilot pressure of 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.

Performance limits

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

Size 25 (W.H 25)

Δp-qV characteristic curves

Symbol	Spool position					Zero position
Symbol	P – A	P – B	A – T	B – T	B – A	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	–	8	–	–	–
U	1	1	2	5	–	–	5	–
V	1	1	2	5	–	8	7	–
Z	1	1	2	5	–	–	–	–
W	1	1	3	4	–	–	–	–

Performance limits

2-spool position valve – qV max in l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring end position in the main valve 1) (at minimum pilot pressure of 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.

Performance limits

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

Size 32

Δp-qV characteristic curves

Symbol E, R and W

Δp-qV characteristic curves

Symbol G and T

Symbol	Spool position
Symbol	P – A	P – B	A – T	B – T	B – A	P – T
E	4	4	3	2	–	–
R	4	4	3	–	1	–
W	4	4	3	2	–	–
G, T	7	8	7	5	–	6

Performance limits

2-spool position valve – qV max in l/min
Symbol	Operating pressure pmax in bar
Symbol	70	140	210	280	350
X external – spring end position in the main valve 1) (at minimum pilot pressure of 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.

Performance limits

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
X external – pressure-centered (at minimum pilot pressure of 15 bar)
all	1100	1100	1100	1100	1100

Performance limits : Important information

Notice (applies to all sizes):

The specified performance 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 performance 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 use, please consult us.

The performance limit was determined when the solenoids were at operating temperature, at 10 % undervoltage and without tank preloading.

Symbols/Circuit diagrams

2 spool positions

1)	Only for NG10 and 25 ("W.H 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)	Type WEH (electro-hydraulic)
A1), C, D, K, Z	../..
	..H../..
	..H../O	–
	..H../OF	–
B1), Y	../..
B1), Y	..H../..	–

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

Valve with spring end position

WEH…/..	WEH…/…E…
WEH…/…ET…	WEH…/…T…

Valve with hydraulic end position

WEH . H../…	WEH . H../O…	WEH . H../OF…
WEH . H../…E…	WEH . H../O…E…	WEH . H../OF…E…
WEH . H../…ET…	WEH . H../O…ET…	WEH . H../OF…ET…
WEH . H../…T…	WEH . H../O…T…	WEH . H../OF…T…

3 spool positions

1)	Example: Symbol E with spool position "a" → ordering code ..EA..
2)	Symbol S only for NG16

Ordering code			Type of actuation
Symbol	Actuating side	Spool return	Type WH (hydraulic)	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	–

Valve with spring-centered zero position

WEH…/..	WEH…/…E…
WEH…/…ET…	WEH…/…T…

Valve with pressure-centered zero position (not "WEH 22")

WEH . H../…	WEH . H../…E…
WEH . H../…ET…	WEH . H../…T…

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".

Dimensions

Project planning information

Downloads

	3/2, 4/2 and 4/3 directional valves, pilot operated Manual \| RE24751-B \| 2009-06-01 \| English \| PDF \| 410k Product Groups: Pilot operated Type 4WEH and 4WH
	Directional spool valves, pilot-operated, with electro-hydraulic actuation Data Sheet \| RE24751-XD \| 2020-07-01 \| English \| PDF \| 1.1MB Product Groups: Pilot operated Type H-4WEH …XD
	Directional spool valves, pilot-operated, with electro-hydraulic actuation Data Sheet \| RE24751-VP1 \| 2016-12-01 \| English \| PDF \| 975k Product Groups: Pilot operated Type WEH…VP1
	Directional spool valves, pilot-operated, with hydraulic or electro-hydraulic actuation Data Sheet \| RE24751 \| 2020-03-01 \| English \| PDF \| 1.3MB Product Groups: Pilot operated Type WEH and WH
	Directional spool valves, pilot-operated, with electro-hydraulic actuation Data Sheet \| RE24751-XE \| 2020-12-01 \| English, United States \| PDF \| 1.1MB Product Groups: Pilot operated Type H-4WEH …XE

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	3/2, 4/2 and 4/3 directional valves, pilot operated Manual \| RE24751-B \| 2009-06-01 \| English \| PDF \| 410k Product Groups: Pilot operated Type 4WEH and 4WH
	Directional spool valves, pilot-operated, with electro-hydraulic actuation Data Sheet \| RE24751-XD \| 2020-07-01 \| English \| PDF \| 1.1MB Product Groups: Pilot operated Type H-4WEH …XD
	Directional spool valves, pilot-operated, with electro-hydraulic actuation Data Sheet \| RE24751-VP1 \| 2016-12-01 \| English \| PDF \| 975k Product Groups: Pilot operated Type WEH…VP1
	Directional spool valves, pilot-operated, with hydraulic or electro-hydraulic actuation Data Sheet \| RE24751 \| 2020-03-01 \| English \| PDF \| 1.3MB Product Groups: Pilot operated Type WEH and WH
	Directional spool valves, pilot-operated, with electro-hydraulic actuation Data Sheet \| RE24751-XE \| 2020-12-01 \| English, United States \| PDF \| 1.1MB Product Groups: Pilot operated Type H-4WEH …XE