Proportional Directional Valve 4WRZE32E1-520-7X/6EG24N9K31/F1D3V - Bosch Rexroth R901174939

Where the working circuit is at times unpressurised while the axis still has to respond, the pilot stage belongs on a circuit of its own. That is exactly what this version with external pilot oil supply and external pilot oil return is built for, at 520 l/min nominal flow and 350 bar operating pressure.

Key benefits

• 520 l/min nominal flow also covers cylinders with a large piston area, with 1600 l/min permitted.
• External pilot supply keeps the axis controllable while the main circuit is switched to idle or unpressurised.
• Spool symbol E1 in three switching positions with four ports, connection diagram ISO 4401-10-09-0-05.
• A 4 to 20 mA command instead of a voltage signal stays immune to voltage drop on long cable runs.
• FKM seals and 350 bar operating pressure allow continuous duty with hot HL oil.

Applications

The valve suits rolling mills, forging presses and large lifting equipment in which the pilot circuit is fed by a separate pump. Because the pilot stage does not depend on working pressure, switching behaviour stays the same under strongly varying load. The concealed auxiliary actuation serves commissioning and emergency operation.

Manufacturer

Bosch Rexroth, material number R901174939, type designation 4WRZE32E1-520-7X/6EG24N9K31/F1D3V. Performance limit curves and dimensions are contained in the data sheet Proportional directional valve, pilot-operated (RE 29115), accompanied by Hydraulic valves and hydro- (RE 07600-B). Weight 44 kg.