Proportional Directional Valve 4WRZE25E220-7X/6EG24N9K31/A1V - Bosch Rexroth R978919540

This valve directs oil flow on a large axis to spool symbol E, at 220 l/min nominal flow with a limit of 870 l/min at 350 bar. Pilot oil enters from outside and drains outside, so pilot pressure can be set independently of working pressure.

Benefits

• 220 l/min nominal flow, flow limit 870 l/min at 350 bar operating pressure
• External pilot oil supply plus external pilot oil return, keeping pilot pressure steady under varying working pressure
• Analog command value plus to minus 10 V into on-board electronics, 24 VDC supply
• Spool symbol E, concealed manual override, 3 switching positions across 4 ports
• FKM seals for HL fluid, UKCA to SI2016/1091, mass of 20.58 kg

Applications

This variant belongs on power units with a dedicated pilot circuit, as found in rolling mills and large presses. The external pilot drain keeps back pressure in the return line away from the pilot stage. Interface ISO 4401-08-08-0-05 matches size 25.

Manufacturer

Bosch Rexroth lists the valve as R978919540. Curves as well as performance limits appear in data sheet RE 29115, with RE 07600-B as further reading.