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

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Data Sheet of 4WRZE series

REXROTH Type Code of 4WRZ Series

 

Rexroth Propotional Valve 4WRZE Description

 

Pilot-operated proportional directional valve type 4WRZ… and 5WRZ.52…

Valves of the type 4WRZ... are pilot-operated 4-directional valves that are actuated by means of proportional solenoids. Their function is to control the flow direction and size.

Valves of type 5WRZ... are equipped with an additional port "R" (only NG52).

 

Set-up:

The valve basically consists of:

Pilot control valve (9) with proportional solenoids (5 and 6)

Main valve (10) with main control spool (11) and centering spring (12)

 

Function:

With de-energized solenoids (5, 6), the main control spool (11) is held in the central position by means of the centering spring (12)

The main control spool (11) is controlled by the pilot control valve (9); the main control spool is proportionally moved, e.g. by actuating solenoid "b" (6)

—The control spool (2) is moved to the right, pilot oil enters the pressure chamber (13) via the pilot control valve (9) and deflects the main control spool (11) proportionally to the electric input signal

—Connection from P to A and B to T via orifice-type cross-sections with progressive flow characteristics

Pilot oil supply to the pilot control valve internally via port P or externally via port X

Switching off the solenoid (6)

—The control spool (2) and main control spool (11) are moved back into the central position

Depending on the switching position, flow occurs from P to A and B to T or P to B and A to T (R)

An optional manual override (14 and 15) can be used to move the control spool (2) without solenoid energization.

 

Notice:

Accidental activation of the manual override may lead to uncontrolled machine movements!

 

Notice:

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

Rexroth 4WRZE Technical Data

For applications outside these parameters, please consult us!

General

Type

4WRZE

Size

10

16

25

32

52

Installation position

 

any, preferably horizontal

Ambient temperature range

°C

-20 … +50

Storage temperature range

°C

-20 … +80

Weight

For subplate mounting

kg

8

12.1

18.4

42.2

79.7

for flange connection

kg

 

77.7

with "D3"

kg

8.5

12.6

18.9

42.7

80.2

Sine test according to DIN EN 60068-2-6

 

10 cycles, 10…2000.. 10 Hz with logarithmic frequency changing speed of 1 octave/min, 5 to 57 Hz, amplitude 1.5 mm (p-p), 57 to 2000 Hz, amplitude 10g, 3 axes

Random test according to DIN EN 60068-2-64

 

20…2000 Hz, amplitude 0.05g2/Hz (10gRMS) 3 axes, testing time 30 min per axis

Shock test according to DIN EN 60068-2-27

 

Half-sine 15g / 11 ms, 3 times in positive and 3 times in negative direction per axis, 3 axes

Damp heat according to DIN EN 60068-2-30

 

Variant 2: +25 °C to +55 °C, 90 % to 97 % relative humidity, 2 cycles á 24 hours

 

Rexroth 4WRZE Features

-Pilot-operated, 2-stage proportional directional valves with integrated electronics (OBE).

-Control of the direction and magnitude of a flow.

-Operation by means of proportional solenoids with central thread and detachable coil.

-For subplate mounting: Porting pattern according to ISO 4401.

-Optional auxiliary operating device.

-Spring-centered control spool.

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