4WRZ25W9-325-7X/6EG24N9EK4/V

The 4WRZ25W9-325-7X/6EG24N9EK4/V proportional directional valve belongs to the WRZ Proportional Directional Valves series manufactured by Bosch Rexroth for hydraulic automation tasks that call for precise spool positioning and regulated flow. Its nominal size of 25 defines the passage cross-section and matches installations built around ISO port plates. Compatibility with the ISO 4401-08-07-0-94 porting pattern lets the valve mount directly on standardized subplates without adapters. A maximum operating pressure of 350 bar supports high-pressure circuits, while a nominal flow of 325 l/min at a 10 bar differential establishes the expected throughput under typical control settings. Peak demand can reach 870 l/min, giving extra headroom when large actuators accelerate. The pilot stage displaces 10 cm³ of oil for a 0–100 % command step, which influences response time and stability. Hysteresis is held to 6 % or less so that repeated commands return the spool to nearly the same position. The solenoid coil shows 4.8 Ω resistance at 20 °C, and the drive electronics may supply up to 1.5 A, parameters that shape power requirements and heat generation.

The valve’s coil can tolerate temperatures up to 150 °C, allowing reliable service near hot power units or within enclosed manifolds. Electrical hookup is made through a DIN EN 175301-803 connector, a style that shortens maintenance time and ensures correct polarity. A concealed manual override lets technicians shift the spool during commissioning or fault finding without exposing internal parts. The enclosure meets IP65, protecting the coil and wiring against dust ingress and low-pressure water jets encountered in industrial wash-downs. Return flow at port T may rise to 250 bar when an external drain is used, enabling layouts with elevated backpressure on tank lines. FKM seals are installed to resist common hydraulic oils and elevated temperatures, extending service intervals. The assembly weighs 18.2 kg, a figure useful for selecting lifting aids and defining manifold support structures.