Rexroth Proportional Servo Valves
Rexroth Valve 3DREME
  • Description
  • Technique Feature
  • Specification
  • Applied Range

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Data Sheet of 3DREME Series

REXROTH type code of 3DRE series

 

 

Product description

Valves of type 3DRE(M)E are electrically pilot-operated 3-way pressure reducing valves with pressure limitation of the actuator. They are used for reducing a system pressure.

 

Technical set-up

- The valve consists of two main assemblies:

Pilot control valve (1) with proportional solenoid (2) optionally with maximum pressure limitation (15)

- Main valve (3) with main spool (4).

- At the pilot control valve, there is moreover a housing (19) with the control electronics. Supply and command value voltage are applied at the connector (20). At the factory, the command value pressure characteristic curve is adjusted with little manufacturing tolerance.

 

Function

General function:

- Command value-dependent setting of the pressure to be reduced in port A via the pilot control valve (1).

- With depressurized port P, the springs (5) and (6) hold the main spool (4) in its central position. In this way, a start-up jump at the actuator is prevented.

- Pilot oil flows from bore (7) via the flow controller (8), via the control chamber (11) to the throttle gap (9), via line (10) to port Y. This connection is to be led into the tank at zero pressure.

 

Pressure reduction:

- Build-up of the pilot pressure in the control chamber (11) as a function of the command value.

- Pressure build-up in the spring chamber (13) via nozzle (12) and movement of the main spool (4) to the right.

- Hydraulic fluid flows from P to A.

- The actuator pressure in port A is available in the spring chamber (14).

- Increase in the pressure in port A to the set pressure of the pilot control valve (1) leads to the movement of the main spool (4) to the left. Pressure in port A is almost identical with the set pressure at the pilot control valve (1).

 

Pressure limitation:

- If the pressure in port A exceeds the set pressure of the pilot control valve (1), the main spool (4) is moved further to the left.

- This opens the connection from A to T and limits the pressure pending in port A to the set command value.

 

Type 3DREME

For hydraulic protection against an inadmissibly high electric control current at the proportional solenoid, which imperatively results in increased pressures in port A, you can optionally install a spring-loaded pressure relief valve as maximum pressure limitation (15).

The maximum pressure limitation is pre-set based on the relevant pressure rating.

 

Pilot oil supply

3DRE...-.../...XY...

External pilot oil supply

Pilot oil return, external

With version ..Y.. (external pilot oil return) port Y is internally connected to port T! Port T is not plugged!

3DRE...-.../...Y...

Internal pilot oil supply

Pilot oil return, external

With version ..Y.. (external pilot oil return) port Y is internally connected to port T! Port T is not plugged!

NG10

Pilot oil supply, sectional diagram NG 10

 

External pilot oil supply

NG16

Pilot oil supply, sectional diagram NG 16

 

 

Technical data

For applications outside these parameters, please consult us!

general

Type

3DRE(M)E

Size

10

16

Component series

 

7X

Installation position

 

any, preferably horizontal

Earth

kg

7.6

10.4

Storage temperature range

°C

-20 … +80

Ambient temperature range

°C

-20 … +50

 

Features

Pilot-operated valves for pressure reduction (P to A) and limitation (A to T) of a system pressure

Proportional solenoid operation

Actuation by proportional solenoid with central thread and detachable coil

For subplate mounting: Porting pattern according to DIN 24340 form A and ISO 4401

Optional maximum pressure limitation

Valve and control electronics from a single source

Integrated electronics (OBE) with little manufacturing tolerance of the command value pressure characteristic curve

Linear pressure/command value characteristic curve

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