Proportional Pressure Reducing Valve 3DRE-7X

The three-way pilot-operated proportional pressure reducing valve 3DRE-7X is a high-precision pressure control component that adjusts the outlet pressure through an electrical signal ratio.The valve 3DRE-7X adopts a three-way design. In addition to the pressure reducing function, it can realize T-port unloading, save energy and reduce heat. The valve is driven by a small flow pilot valve, which is more accurate in adjustment and has low power consumption.

Product parameter of Proportional Pressure Reducing Valve 3DRE-7X

Product Feature And Application of Proportional Pressure Reducing Valve 3DRE-7X

Features:

▶3-way version

▶Operation by means of proportional solenoid with rotatable coil

▶For subplate mounting

▶Porting pattern according to ISO 4401

▶Maximum pressure limitation, optional

▶Valve and control electronics from a single source

▶Integrated electronics(OBE)(type HD-3DRE(M)E):

- Little manufacturing tolerance of the command value pressure characteristic curve

▶External control electronics(type HD-3DRE(M)

▶Linear command value pressure characteristic curve

Application:

The three-way pilot-operated proportional pressure reducing valve 3DRE-7X can be used in industrial hydraulic systems, engineering machinery, test equipment and test benches, aerospace and shipbuilding, high-temperature hydraulic systems of metallurgical equipment (such as continuous casting machines), etc.

Function and Section of Proportional Pressure Reducing Valve 3DRE-7X

Function, section

The valve types 3DRE(M) and 3DRE(M)E 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 a 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.