Proportional Directional Valve 4WRZ25W8-220-7X/6EG24N9K4/D3M - Bosch Rexroth R900978826

The 4WRZ25W8-220-7X/6EG24N9K4/D3M is a pilot-operated proportional directional valve in size 25 with symbol W8. Pilot oil is fed in externally and discharged externally, and nominal flow is 220 l/min.

Benefits

• External pilot oil supply and external return, independent of pressure and back pressure in the main circuit.
• Nominal flow 220 l/min, maximum 870 l/min at 350 bar operating pressure.
• Spool symbol W8 with 3 switching positions and 4 ports.
• Integrated pressure reducing valve in the pilot stage, plus a concealed auxiliary actuation.
• 20.88 kg, NBR seals, external electronics, connection diagram ISO 4401-08-08-0-05.

Applications

This pilot routing makes sense on plants with their own pilot circuit or with back pressure in the tank channel. Both paths then stay decoupled from the main circuit. Symbol W8 defines the control edges and the centre position, and the amplifier electronics sit outside the valve.

Manufacturer

The manufacturer is Bosch Rexroth, material number R900978826, product family 4WRZ(E). Characteristic curves, step responses and installation dimensions are in data sheet RE 29115, RE 07600-B gives the range overview.