4WRZ25W6-325-7X/6EG24N9TK4/M

The 4WRZ25W6-325-7X/6EG24N9TK4/M valve belongs to the WRZ Proportional Directional Valves series and is manufactured by Bosch Rexroth. It modulates flow and direction in hydraulic automation circuits where variable speed and controlled motion are required. An electrical connection using a DIN EN 175301-803 plug permits straightforward coil wiring with standard cabinet hardware. Mineral oil in HL or HLP grades per DIN 51524 is specified as the hydraulic fluid so internal clearances and seals remain compatible with common system oils. The main stage tolerates operating pressures up to 350 bar, allowing service on high-pressure actuators without external reducers. A nominal flow of 325 l/min at a 10 bar pressure drop defines the throughput available for large cylinders or motors. Port diameters are 25 mm for A, B, and T and 24 mm for P, matching flow capacity while limiting velocity losses. A porting pattern that follows ISO 4401-08-07-0-94 supports direct mounting on standardized subplates, and the assembled weight of 18.2 kg must be considered when sizing support brackets. Pilot oil is routed with an external supply and an internal drain so installation only needs an inlet pilot line while return flow leaves through the valve body.

The valve works in ambient temperatures up to 70 °C, enabling placement near hydraulic power units that generate moderate heat. Hydraulic fluid may reach 80 °C without impairing function, ensuring reliable modulation during prolonged duty cycles. Hysteresis is held below 6 %, maintaining repeatable spool positioning when the drive signal reverses. Return pressure at port T is limited to 30 bar for the internally drained pilot oil, preventing back-pressure from disturbing spool control. During a 0–100 % command step the pilot stage consumes 7 l/min, and a pilot volume of 10 cm³ must be pressurized to shift the main spool, data used when configuring pressure reducers and accumulators. NBR seals resist mineral oil and contain leakage across the stated temperature range. These thermal limits, pilot consumption values, and sealing choices combine to support stable proportional control in closed-loop hydraulic drives.