Bosch Rexroth 3DRE 10 P-7X/200YG24K4V R901152580

Valves of type 3DRE(M) are electrically pilot-operated 3-way pressure reducing valves with pressure limitation of the actuator. They are used for reduction (P to A) and limitation (A to T) of a system pressure. Set-up The valves consist of two main assemblies:

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

• Main valve (3) with main control spool (4)

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 control spool (4) in its central position. In this way, a start-up jump at the actuator is prevented.

• Pilot fluid 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 function of the command value.

• Pressure build-up in the spring chamber (13) via nozzle (12) and movement of the main control 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 control 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 3DREM 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, referred to the relevant pressure rating (see "Technical data"). Pilot oil supply Size 10 Size 16

1	Plug screw M6 according to DIN 906, wrench size 3 - Pilot oil return
2	Main valve
3	Cover

Pilot oil supply	Pilot oil return
External	1 closed	External
Internal	1 open

Version "XY" The pilot oil is supplied externally from a separate pilot circuit. The pilot oil return is implemented externally via port Y into the tank. Version "Y" The pilot oil supply is implemented internally from channel P of the main valve. The pilot oil return is implemented externally via port Y into the tank. In the subplate, port X is closed.