Proportional Directional Valve 4WRZE25W8-220-7X/6EG24N9EK31/A1D3V - Bosch Rexroth R900971637

Filters, coolers and long return runs build up counter-pressure in the tank line that upsets the pilot stage of a large directional valve. This variant still draws pilot oil internally but drains it through a separate line, metering 220 l/min nominal flow in size 25.

Benefits

• External pilot oil return, so tank-line counter-pressure does not act on the pilot stage.
• Internal pilot oil take-off, one supply line fewer than on a fully external build.
• 220 l/min nominal flow, flow up to 870 l/min, operating pressure up to 350 bar.
• ±10 V command value, 24 VDC supply, connection through a 7-pole connector (6 + PE).
• Spool symbol W8, 3 switching positions, weight 20.6 kg, FKM seals.

Applications

The build makes sense wherever several consumers share one return line. The dedicated control-oil return has to run pressureless to tank and must not be tied into the working return. At 220 l/min the spool stroke stays well used.

Manufacturer

Bosch Rexroth, material number R900971637. Product family 4WRZ(E), size 25, subplate mounting, UKCA conformity to SI2016/1091. Further details are given in data sheets RE 29115 and RE 07600-B.