4WRZE25W8-220-7X/6EG24N9K31/A1M

The 4WRZE25W8-220-7X/6EG24N9K31/A1M proportional directional valve belongs to the WRZ Proportional Directional Valves series and is manufactured by Bosch Rexroth for hydraulic automation systems that require smooth, electrically modulated flow control. It is powered by a 24 V DC supply so that onboard electronics can drive the internal spool positioner. A ±10 V command signal serves as the reference input, enabling closed-loop control from an external controller. The wiring uses a DIN EN 175201-804 connector interface to simplify field replacement. Maximum hysteresis is limited to 6 %, which helps maintain repeatable spool positioning across cycles. The valve is built on the ISO 4401-08-07-0-94 mounting pattern, allowing direct installation onto standardized subplates. At a differential pressure of 10 bar it delivers a nominal flow of 220 l/min, giving adequate capacity for medium-to-large actuators. The hydraulic envelope is rated for 350 bar maximum operating pressure, and the subplate version weighs 18.4 kg, a factor to consider when selecting manifold supports.

The main stage conforms to cleanliness class 20/18/15 per ISO 4406, so upstream filtration must hold particle counts within that range to prevent wear. Sealing elements are made from NBR, which provides compatibility with common mineral hydraulic oils. A concealed manual override allows technicians to shift the spool mechanically during commissioning without exposing moving parts. The pilot stage requires 7 l/min of oil flow when driven from 0 to 100 %, and the associated displacement is 10 cm³, values that define the pilot supply circuit sizing. When an external drain is used, port T may see pressures up to 250 bar; with an internal drain the same port must remain below 30 bar. Port Y is also limited to 30 bar, protecting the pilot return path. These pressure limits, together with the pilot flow figures and cleanliness requirements, establish the operating boundaries that ensure stable proportional control over the connected hydraulic actuators.