4WRZ25W6-325-7X/6EG24N9K4/D3M

The 4WRZ25W6-325-7X/6EG24N9K4/D3M proportional directional valve belongs to the WRZ Proportional Directional Valves series manufactured by Bosch Rexroth for precise hydraulic automation. Valve size 25 defines the cross-sectional area of the ports and matches the flow demands of large actuators. A nominal flow of 325 l/min at a 10 bar pressure drop enables rapid cylinder or motor movement in production equipment. The main stage tolerates operating pressures up to 350 bar so it can be placed in high-pressure supply lines. The ISO 4401-08-07-0-94 mounting interface facilitates bolt-on installation to standardized subplates. An external pilot oil supply and an external drain keep the control circuit clean and stable even when tank pressure fluctuates. The built-in D3 pressure reducing valve maintains a regulated pilot pressure to ensure consistent spool positioning. A mass of 18.2 kg must be considered when designing handling fixtures or service procedures. A command value overlap of 15 percent introduces a defined neutral zone that prevents unintended flow when the electrical input is near zero.

The solenoid circuit shows a coil resistance of 4.8 Ω at 20 °C, establishing the baseline current–voltage relationship for the driver electronics. A maximum coil current of 1.5 A limits the amplifier output needed to reach full spool stroke. The winding can withstand temperatures up to 150 °C, allowing operation in hot manifolds without loss of function. Connection is made through a DIN EN 175301-803 plug, which speeds replacement and guarantees pin compatibility with common harnesses. A concealed manual override identified by code N9 lets maintenance staff shift the spool mechanically while protecting the device from dirt ingress. Total hysteresis not exceeding 6 percent improves positional repeatability when the valve is used in closed-loop control. The housing meets IP65, so dust-tight sealing and resistance to water jets support outdoor or wash-down machinery. A permissible return-line pressure of 250 bar on the external drain path allows the valve to function in systems that develop elevated backpressure without risking pilot contamination.