Proportional Directional Valve 4WRZE25W9-220-7X/6EG24N9EK31/A1D3V - Bosch Rexroth R900742999

Once back pressure builds in the tank line, an internally returned pilot stage no longer works cleanly. This version of the 4WRZE25W9-220 still draws pilot oil internally from the pressure port but discharges it through an external Y line, at 220 l/min nominal flow.

Benefits

• Internal pilot supply, external pilot return, pilot control stays independent of tank line back pressure.
• 220 l/min nominal flow, up to 870 l/min in size 25.
• Command value plus/minus 10 V into on-board electronics, no external amplifier needed.
• 350 bar operating pressure, FKM seals for hydraulic fluid HL.
• Pressure reducing valve in the pilot stage and concealed auxiliary actuation.
• 20.84 kg weight, connection diagram ISO 4401-08-08-0-05.

Applications

The variant fits systems with long or filtered return lines, such as large presses and test benches where tank pressure rises in operation. The separate Y line is routed straight to tank. Installation is otherwise identical to the internally returned version.

Manufacturer

Bosch Rexroth, material number R900742999, product family 4WRZ(E). Details are given in data sheets RE 29115 and RE 07600-B.