Proportional Directional Valve 4WRZ25W6-220-7X/6EG24N9ETK4/D3M - Bosch Rexroth R900978732

When system pressure drifts across the cycle, switching times drift with it unless something counters that. The 4WRZ25W6-220-7X/6EG24N9ETK4/D3M limits its pilot pressure internally to a fixed value and controls 220 l/min nominal flow.

Benefits

• Fixed pilot pressure through a built-in pressure reducing valve, independent of the pressure level in the main circuit.
• Internal supply and internal return, connection is limited to the ISO 4401-08-08-0-05 pattern.
• 220 l/min nominal flow, flow up to 870 l/min, spool symbol W6 in size 25.
• 20.4 kg weight, 350 bar maximum operating pressure, NBR seals, HL hydraulic fluid.
• Concealed auxiliary actuation and supply at 24 VDC through a 7-pole (6 + PE) plug.

Applications

The version fits cycled plants such as punching machines and forming presses where pressure jumps noticeably between working and return stroke. The reduced pressure of its own keeps conditions at the pilot stage steady. No additional control lines are needed.

Manufacturer

Bosch Rexroth, material number R900978732. Pilot pressure, pilot oil demand and characteristic curves are given in data sheet RE 29115, supplemented by RE 07600-B.