Rexroth Proportional Servo Valves
Rexroth Valve 4WRLE
  • Description
  • Technique Feature
  • Specification
  • Applied Range

Download:

Data Sheet of 4WRLE series

REXROTH Type Code of 4WRLE Series

 

 

Product description

Symbol E and W

 

The valve type 4WRLE is a pilot-operated directional control valve with electrical position feedback and integrated electronics (OBE).

 

Set-up

The valve basically consists of 3 main assemblies:

‐Pilot control valve (1) with control spool and sleeve, return spring, control solenoid and inductive position transducer

‐Main valves (2) with centering springs and position feedback

‐Integrated control electronics (OBE) (3)

 

Function

When the integrated control electronics (OBE) is switched off or inactive, the control spool of the pilot control valve is spring-operated in the “fail-safe" position. The control spool of the main valve is its spring-centered central position.

The integrated control electronics (OBE) compares the specified command value to the position actual value of the main valve control spool. In case of control deviations, the control solenoid will be activated. Due to the changed magnetic force, the pilot control spool is adjusted against the corresponding spring. The flow which is activated via the control cross-sections leads to an adjustment of the main control spool. The stroke/control cross-section of the main control spool is regulated proportionally to the command value.

The pilot oil supply in the pilot control valve is either internal via port P or external via port X. The feedback can be internal via port T or external via port Y to the tank.

 

Failure of supply voltage

If the supply voltage fails or in case of cable break, the integrated electronics will de-energize the control solenoid, the pilot control spool will move to the fail-safe position and will unload the pilot oil chambers of the main valve. Operated by the spring, the main valve control spool will move to the central position.

 

Notice:

Pilot-operated 4/3-directional control valves with positive overlap are functional in controlled or regulated axes. The overlap in the de-energized state is approx. 20% of the control spool stroke. While the electrical supply voltage is switching off, the drive may be accelerated for a short time in functional direction P to B.

 

Symbol V and V1-

 

The valve type 4WRLE is a pilot-operated directional control valve with electrical position feedback and integrated electronics (OBE).

 

Set-up

The valve basically consists of 3 main assemblies:

‐Pilot control valve (1) with control spool and sleeve, return spring, control solenoid and inductive position transducer

‐Main valves (2) with centering springs and position feedback

‐Integrated control electronics (OBE) (3)

 

Function

When the integrated control electronics (OBE) is switched off or inactive, the control spool of the pilot control valve is spring-operated in the “fail-safe" position. The control spool of the main valve is in its spring-centered offset position at approx. 6% of the stroke in direction P to B/A to T.

The integrated control electronics (OBE) compares the specified command value to the position actual value of the main valve control spool. In case of control deviations, the control solenoid will be activated. Due to the changed magnetic force, the pilot control spool is adjusted against the corresponding spring. The flow which is activated via the control cross-sections leads to an adjustment of the main control spool. The stroke/control cross-section of the main control spool is regulated proportionally to the command value. In case of a command value presetting of 0 V, the electronics adjust the control spool of the main valve to central position.

The pilot oil supply in the pilot control valve is either internal via port P or external via port X. The feedback can be internal via port T or external via port Y to the tank.

 

Failure of supply voltage

If the supply voltage fails or in case of cable break, the integrated electronics will de-energize the control solenoid, the pilot control spool will move to the fail-safe position and will unload the pilot oil chambers of the main valve. Operated by the spring, the main valve control spool will move to the offset position (approx. 6% P to B/A to T).

 

Notice:

Pilot-operated 4/3 directional control valves are only functional in the active control loop and do not have a locking basic position when deactivated. Consequently "external isolator valves" are required in many applications and must be taken into account regarding the switch-on/switch-off order. While the electrical supply voltage is switching off, the drive may be accelerated for a short time in functional direction P to B.

Pilot oil supply

NG10

 

Pilot oil supply

NG16

 

Pilot oil supply

NG25

 

Pilot oil supply

NG27

 

Pilot oil supply

NG35

 

 

Technical data

For applications outside these parameters, please consult us!

general

Type

4WRLE

Size

10

16

25

27

35

Component series

 

4X

Installation position

 

Any

Earth

kg

9

12

19

21

80

Ambient temperature range

°C

-20 … +60

Sine test according to DIN EN 60068-2-6

 

10...2000...10 Hz / maximum 10 g / 10 cycles / 3 axes

Random test according to DIN EN 60068-2-64

 

20 ... 2000 Hz / 10 gRMS / 30 g peak / 30 min / 3 axes

Shock test according to DIN EN 60068-2-27

 

15 g / 11 ms / 3 axes

Maximum relative humidity 1)

%

95

Maximum surface temperature 2)

°C

120

MTTFd values according to EN ISO 13849

yrs

75

 

1) no condensation

2) Individual design

Reliable - proven and robust design

High quality – control spool and sleeve of the pilot control valve in servo quality

The control spool of the pilot control valve is in the “fail-safe” position when the unit is switched off

The control spool of the main valve is in the spring-centered central position and/or in the offset position

Flexible - suitable for position, velocity and pressure control

Precise - high response sensitivity and little hysteresis

Hot keywords:Rexroth Origin, New Valves, Made in Germany
Leave Messages Please Feel free to give your inquiry in the form below.We will reply you in 24 hours.
Related Keywords:
Top
Product Catalog
Products