Proportional Directional Valve 4WRZ25E220-7X/6EG24N9K4/D3M - Bosch Rexroth R900786994

An accumulator in the pilot circuit holds control pressure ready when the pump has already stopped. The 4WRZ25E220-7X/6EG24N9K4/D3M uses that circuit through an external supply and return, limits pressure with its own reducing valve and controls 220 l/min nominal flow.

Benefits

• External supply and external return, pilot control stays fed while the main drive is stopped.
• Built-in pressure reducing valve, accumulator pressure may sit above the required pilot pressure.
• 220 l/min nominal flow, flow up to 870 l/min, spool symbol E in size 25.
• 20.65 kg weight, 350 bar maximum operating pressure, ISO 4401-08-08-0-05 pattern.
• Concealed auxiliary actuation, commanded at 24 VDC through an external amplifier.

Applications

This layout appears on plants whose axes are brought into a defined position under control during an emergency stop. The accumulator supplies pilot oil for the last movements, and concealed auxiliary actuation serves to test that function. Pilot supply and return are led outside.

Manufacturer

Bosch Rexroth, material number R900786994. Pilot oil demand per switching operation and the permitted supply pressure are given in data sheet RE 29115, range overview in RE 07600-B.