Proportional Directional Valve 4WRZ25W8-220-7X/6EG24N9TK4/M - Bosch Rexroth R901067922

A separately fed pilot circuit keeps control pressure steady even when main pressure drops during a load change. The 4WRZ25W8-220-7X/6EG24N9TK4/M is built for that, takes pilot oil externally, drains it internally and controls 220 l/min nominal flow.

Benefits

• External pilot supply through the X line, pilot pressure stays independent of load changes in the main circuit.
• Internal return, an additional Y line is not needed.
• 220 l/min nominal flow, up to 870 l/min flow, spool symbol W8 in size 25.
• 19.92 kg weight, 350 bar maximum operating pressure on the ISO 4401-08-08-0-05 pattern.
• Concealed auxiliary actuation and control through an external amplifier at 24 VDC.

Applications

This version is used on presses and lifting gear whose system pressure varies strongly across the cycle. A dedicated pilot circuit can be laid out there with constant pressure and its own filtration grade. For the return, the tank channel of the connection pattern is enough.

Manufacturer

Bosch Rexroth, material number R901067922. Required pilot pressure and pilot oil demand are given in data sheet RE 29115, with RE 07600-B for further reading.