Proportional Directional Valve 4WRZE25E1-325-7X/6EG24N9TK31/F1M - Bosch Rexroth R901140321

If pressure in the main channel drops during the cycle, the pilot stage must not drop with it. This variant therefore takes its pilot oil externally through X, returns it internally to T and controls 325 l/min from a 4...20 mA current command.

Benefits

• External pilot oil supply keeps the control pressure steady even when working pressure falls within the cycle.
• Internal pilot oil return saves the Y line and keeps the manifold plumbing simple.
• Nominal flow 325 l/min, up to 870 l/min at maximum, operating pressure 350 bar.
• A 4...20 mA current command feeds the on-board electronics, supply is 24 VDC through a 7-pole connector (6 + PE).
• Spool symbol E1, interface pattern ISO 4401-08-08-0-05, mass 20.58 kg.

Applications

It is typically used on presses and injection moulding machines whose system pressure varies within the cycle while the axis still has to run smoothly. The X line goes to a separate control circuit, the drain uses the tank channel of the manifold. Hydraulic fluid HL is intended.

Manufacturer

Bosch Rexroth builds this valve under material number R901140321. Quote that number when ordering and keep it in the spare parts list of the machine. Characteristic curves, installation dimensions and connection diagrams are in data sheet RE 29115 and RE 07600-B.