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Артикул: RX7407

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Directional spool valves, pilot operated, with electro-hydraulic actuation H-4WEH…XD

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Description

  • Size 10 … 32
  • Component series 4X, 7X, 6X
  • Maximum operating pressure 350 bar
  • Maximum flow 1100 l/min
  • Area of application in accordance with the Explosion Protection Directive 2014/34/EU: I M2; II 2G
  • Type of protection valve:
    – Ex h I Mb X according to EN 80079-38
    – Ex h IIC T4 Gb X according to EN 80079-36
  • Type of protection, solenoid coil:
    – Ex db I Mb nach EN 60079-1
    – Ex db IIC T4 Gb nach EN 60079-1
  • Solenoid coil certified according to IECEx

Features

  • 4/3- or 4/2-way version
  • For intended use in potentially explosive atmosphere
  • Internal or external pilot control
  • Subplate mounting
  • Porting pattern according to ISO 4401
  • Spring centering, spring end position or hydraulic end position
  • Wet-pin DC solenoids
  • Manual override
  • Electrical connection as individual connection with cable gland
  • Switching time adjustment, optional
  • Preload valve in channel P of the main valve, optional

Product description

Type H-4WEH 16…XD...

The valve type H-4WEH is a directional spool valve with electro-hydraulic actuation. It controls the start, stop and direction of 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.

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). The pilot control valve is supplied with pilot oil via the control line (7). Supply can be effected 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 ports P with B and A with T in the main valve.

When the solenoid is switched off, the pilot control spool returns into the initial position (except for impulse spool). The spring chamber (8) is unloaded to the tank.

The pilot oil from the spring chamber is displaced into channel Y via the pilot control valve.

The pilot oil supply and return can be effected internally or externally.

The manual override (9) allows the control spool (10) to be moved without solenoid energization.

Notice:

The main control spool (2) is held in a central position by the return springs (3.1) and (3.2) in spring chambers (6) and (8) without pilot pressure, even if the valve is positioned for example vertically.

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

Pilot oil supply

"H-WEH"

The pilot oil supply is effected externally via the X channel from a separate pressure supply.

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

"H-WEH…E…"

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

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

"H-WEH…ET…"

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

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

"H-WEH…T…"

The pilot oil supply is effected externally via the X channel from a separate pressure supply.

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

Throttle insert

The use of the throttle insert is necessary if the pilot oil supply in the P channel of the pilot control valve is to be limited.

1

Pilot control valve

2

Throttle insert

3

Seal ring

Type code

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

16

17

18

19

H

4

WEH

/

6B

G24

N

XD

Z2

01

Up to 350 bar

H

02

4-way version

4

Type of actuation

03

Electro-hydraulic

WEH

Size

04

NG10

10

NG16

16

NG25

25

NG32

32

Control spool return main valve

05

By means of springs

no code

Hydraulic

1)

H

06

Symbols; for the possible version, see "Symbols/Circuit diagrams"

e.g. C

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

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

OF

Pilot control valve

09

High-power valve

6B

10

Direct voltage 24 V

G24

11

With manual override

N

Explosion protection

12

"Flameproof enclosure", for details, please refer to the "information on explosion protection"

XD

Pilot oil flow

13

External pilot oil supply, external pilot oil return

2)

no code

Internal pilot oil supply, external pilot oil return

3)

E

Pilot oil supply internal, pilot oil return internal

3)

ET

External pilot oil supply, internal pilot oil return

2)

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

15

Solenoid with terminal box and cable gland; for details please refer to "Electrical connection"

Z2

Throttle insert

16

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

preload valve (not for NG10)

17

Without preload valve

no code

With preload valve (pö = 4.5 bar)

P4,5

18

Without pressure reducing valve

no code

With pressure reducing valve

4)

D3

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

19

NBR seals

no code

FKM seals

V

1)2 spool positions (hydraulic end position): only symbols C, D, K, Z, Y
2)Pilot oil supply X or return Y external:
– Maximum pilot pressure: see "Technical data".
– At a higher pilot pressure, version "D3" must be used.
3)Pilot oil supply internal (versions "ET" and "E"):
– Minimum pilot pressure: see "Technical data".
– Maximum pilot pressure: see "Technical data".
– In order to prevent inadmissibly high pressure peaks, a throttle insert "B10" has to be provided in port P of the pilot control valve (see "Product description").
– Version "D3" must be used.
4)Only in connection with the "B10" throttle insert

Notice:

The manual override cannot be allocated a safety function and may only be used up to a tank pressure of 50 bar.

Technical data

general

Size

10162532

Weight

Valve with one solenoid

kg

1113.52239

Valve with two solenoids, spring-centered

kg

1416.52542

Switching time adjustment "S" and "S2"

kg

0.8

Pressure reducing valve "D3"

kg

0.4

Installation position 1)

Any

Ambient temperature range

°C

-20 … +80

Storage temperature range

°C

+5 … +40

Maximum storage time

Years

1

Maximum admissible acceleration amax

g

10

Surface protection

Galvanized

MTTFD values according to EN ISO 13849

Years

100
1)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.

hydraulic

Size

10162532

Maximum operating pressure

Port P

bar

350

Anschluss A

bar

350

Port B

bar

350

Port T

External pilot oil return Y

bar

250

Internal pilot oil return Y

bar

210

Port Y

Pilot oil return, external

bar

210

Maximum flow of the main valve

l/min

1603007001100

Maximum pilot pressure

Port X

Standard

bar

250

Pressure reducing valve "D3"

bar

350

Minimum pilot pressure

External or internal pilot oil supply X (symbols D, K, E, J, L, M, Q, R, U, W)

3-spool position valve, spring-centered

bar

1214138.5

2-spool position valve, spring end position

bar

10141310

2-spool position valve, hydraulic end position

bar

71485

Internal pilot oil supply X (symbols C, F, H, P, T, V, Z, S) 1)

bar

7.5 2)4.5 3)

Pilot volume for switching process

3-spool position valve, spring-centered

cm³

2.045.7214.229.4

2-spool position valve

cm³

4.0811.4528.458.8

Pilot volume for shortest switching time, approx.

l/min

3545

Hydraulic fluid

see table "Hydraulic fluid"

Hydraulic fluid temperature range

NBR seals

°C

-20 … +80

FKM seals

°C

-15 … +80

Viscosity range

mm²/s

2.8 … 500

Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 4)

Class 20/18/15
1)Symbol S only for NG16
2)For symbols C, F, G, H, P, T, V, Z, an internal pilot oil supply is only possible if the flow from P → T in the central position (for 3-spool position valve) or while crossing the central position (for 2-spool position valve) is so large that the pressure differential of P → T reaches a value of at least 7.5 bar. At a pressure differential below 7.5 bar, a check valve with a cracking pressure of 7.5 bar must be installed in the return line to the tank. Pilot oil return Y must be realized externally.
3)For symbols C, F, G, H, P, T, V, Z, S (Symbol S only for Size 16) – by meansof a preload valve (not Size 10) or a correspondinglyhigh flow.
4)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.

Hydraulic fluid

Classification

Suitable sealing materials

Standards

data sheet

Mineral oils

HL, HLP, HLPD

NBR, FKM

DIN 51524

90220

Bio-degradable

Insoluble in water

HETG

FKM

ISO 15380

90221

HEES

FKM

Soluble in water

HEPG

FKM

ISO 15380

Flame-resistant

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.

electrical

Voltage type

Direct voltage

Nominal voltage according to VDE 0580

V

24 / 110

Voltage tolerance (nominal voltage)

%

± 10

Admissible residual ripple

%

< 5

Duty cycle/operating mode according to VDE 0580

S1 (continuous operation)

Switching time according to ISO 6403

See "switching times" table

Maximum switching frequency

1/h

15000

Maximum switch-off voltage peaks Solenoid 1)

V

500

Nominal power with ambient temperature 20 °C

W

13

Maximum power with 1.1 x nominal voltage and an ambient temperature of 20 °C

W

15.8

Protection class according to EN 60529

IP65 (If a suitable and a correctly mounted mating connector are used.)
1)Suitable damping by user required

Information on explosion protection

Application according to Explosion Protection Directive 2014/34/EU

I M2II 2G

Type of protection valve 1)

Ex h I Mb XEx h IIC T4 Gb X

Maximum surface temperature 2)

°C

105

Temperature class

-T4

Valve solenoid type of protection according to EN 60079-7 / EN 60079-18

Ex db I MbEx db IIC T4 Gb

Baumusterprüfbescheinigung Magnet

BVS 03 ATEX E 300 X

“IECEx Certificate of Conformity” for solenoid

IECEx BVS 1191 X
1)Ex h: structural safety c according to EN 80079-37.
2)Surface temperature > 50 °C, provide contact protection.

Special application conditions for a safe application

  • Connection lines must be passed in a strain-relieved way. The first mounting point must be within 150 mm of the cable and line entry.
  • In order to avoid dangers caused by static charge, the base and/or subplate on which the valve is to be fitted must be electrically conductive and included in the equipotential bonding.
  • The valve solenoid must not be installed close to charge generating processes.
  • Contact of the connection cable with the casing surface is to be prevented.

Switching times

Pilot pressure

bar

70

250

Spring

ON

OFF

NG10

Without throttle insert

ms

50 … 70

50 … 70

30 … 40

With throttle insert

ms

70 … 100

60 … 80

30 … 40

NG16

Without throttle insert

ms

60 … 90

50 … 70

60 … 90

With throttle insert

ms

120 … 140

90 … 110

60 … 90

NG25

Without throttle insert

ms

80 … 110

60 ... 80

110 ... 140

With throttle insert

ms

210 …260

130 … 160

110 ... 140

NG32

Without throttle insert

ms

90 … 140

80 … 110

150 … 170

With throttle insert

ms

430 … 570

240 … 360

150 … 170

Notices:

  • Switching time = 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 hydraulic fluid temperatures, variations may occur.
  • 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.

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

Size

10162532

Symbol Q

A – T; B – T

mm²

13328378

Symbol V

A – T; B – T

mm²

13328373

P – A; P – B

mm²

13328384

Symbol W

A – T; B – T

mm²

2.461420

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

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

Size 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

8 Symbol R, spool position B – A

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

Size 32

Δp-qV characteristic curves

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

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.

NG16

  • With pilot oil supply X internal, a preload valve has to be used for volume flows <160 l/min due to the negative overlap of symbols C, V and HC, HZ.
  • With pilot oil supply X internal, a sufficient volume flow has to be ensured due to the negative overlap of symbols F, G, H, P, S and T (for the determination of the required volume flow, see "Preload valve" characteristic curves. If the required volume flow is not reached, a preload valve has to be used (see "Technical data").

NG25

  • With pilot oil supply X internal, a preload valve has to be used for volume flows <180 l/min due to the negative overlap of the symbols Z, HZ and V.
  • With pilot oil supply X internal, a sufficient volume flow has to be ensured due to the negative overlap of symbols C, HC, F, G, H, P, and T (for the determination of the required volume flow, see "Preload valve" characteristic curves. If the required volume 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 volume flows <180 l/min due to the negative overlap of the symbols Z, HZ and V.
  • With pilot oil supply X internal, a sufficient volume flow has to be ensured due to the negative overlap of symbols C, HC, F, G, H, P, and T (for the determination of the required volume flow, see "Preload valve" characteristic curves. If the required volume flow is not reached, a preload valve has to be used (see "Technical data").

Symbols/Circuit diagrams

load error

Electrical connection

load error

Dimensions

load error

Project planning information

load error

Downloads

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
4/2 and 4/3 directional valves, internally pilot-operated, externally pilot-operated, Type H-4WEH...XD..., Operating instructions
Manual | RE24751-XD-B | 2020-07-01 | English | PDF | 1.8MB

Product Groups: Pilot operated
Explosion-protected hydraulic products for industrial and mobile applications
Brochure | R999000373 | 2017-03-01 | English | PDF | 5.8MB

Product Groups: Pumps, CD - single rod cylinder, Proportional, high-response and servo valves, Axial piston pumps, Mobile controls
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