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Артикул: RX7418

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

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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

1

closed

Internal

2, 3​

open

Internal

1

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

02

03

04

05

06

07

08

09

10

11

12

13

14

15

16

17

18

19

20

21

22

/

/

*

01

Up to 280 bar

no code

Up to 350 bar

H-

Main ports

02

3-way version

3

4-way version

4

Type of actuation

03

Hydraulic

WH

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

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

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

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

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

With preload valve

P4,5

20

Without pressure reducing valve

no code

With pressure reducing valve

D3 7)

Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")

21

NBR seals

no code

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

WHH-WHWEHH-WEHWHH-WHWEHH-WEHWH22H-WH22WEH22H-WEH22WH25H-WH25WEH25H-WEH25WHH-WHWEHH-WEH

Size

10162532

Weight (approx.)

Valve with one solenoid

kg

6.48.511.517.617.6

Valve with two solenoids, spring-centered

kg

6.88.911.91941

Valve with two solenoids, pressure-centered

kg

6.88.911.91941

Valve witch hydraulic actuation (type WH...)

kg

5.57.310.516.539.5

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

150100150100150100150100150100

hydraulic

Type

WHH-WHWEHH-WEHWHH-WHWEHH-WEHWH22H-WH22WEH22H-WEH22WH25H-WH25WEH25H-WEH25WHH-WHWEHH-WEH

Size

10162532

Maximum operating pressure

Port P

bar

280350280350280350280350280350280350280350280350280350280350

Anschluss A

bar

280350280350280350280350280350280350280350280350280350280350

Port B

bar

280350280350280350280350280350280350280350280350280350280350

Port T

External pilot oil return Y

bar

280315280315250

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

121410.512.510.512.5138.5

3-spool position valve, pressure-centered

bar

-16-188.5

2-spool position valve, spring end position

bar

1014111411141310

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

1332788378

Symbol V

P – A; P – B

mm²

1332738373

A – T; B – T

mm²

1332848384

Symbol W

A – T; B – T

mm²

2.46101420

Pilot volume for switching process

3-spool position valve, spring-centered

cm³

2.045.727.6414.229.4

2-spool position valve

cm³

4.0811.4515.2828.458.8

3-spool position valve, pressure-centered

from zero position in switching position “a”

cm³

-2.83-7.1514.4

from switching position “a” in zero position

cm³

-5.722.9-14.18729.415.1

from zero position in switching position “b”

cm³

-5.72-14.1814.1529.4

from switching position “b” in zero position

cm³

-8.552.83-19.885.7343.814.4

Pilot flow for shortest switching time, approx.

l/min

3545
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

HEES

FKM

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

ON

OFF

NG10

Without throttle insert

ms

40 ... 60

40 ... 60

20 ... 30

With throttle insert

ms

60 ... 90

50 ... 70

20 ... 30

NG16

Without throttle insert

ms

50 ... 80

40 ... 60

50 ... 80

With throttle insert

ms

110 ... 130

80 ... 100

50 ... 80

NG25 (WEH 22)

Without throttle insert

ms

40 ... 70

40 ... 60

50 ... 70

With throttle insert

ms

140 ... 160

80 ... 110

50 ... 70

NG25 (WEH 25)

Without throttle insert

ms

70 ... 100

50 ... 70

100 ... 130

With throttle insert

ms

200 ... 250

120 ... 150

100 ... 130

NG32

Without throttle insert

ms

80 ... 130

70 ... 100

140 ... 160

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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../O​F

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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