4WRZ16W8-150-7X/6EG24N9ETK4/D3M-674

The 4WRZ16W8-150-7X/6EG24N9ETK4/D3M-674 proportional directional valve belongs to the WRZ Proportional Directional Valves series from Bosch Rexroth and is used in hydraulic automation to vary flow and direction according to an electrical command. It is energized by a 24 V DC supply voltage so common PLC power rails can drive the coil. The coil resistance is 4.8 Ω at 20 °C, establishing the nominal current that flows when the solenoid is actuated. A maximum current of 1.5 A defines the highest command signal the amplifier may deliver without overheating the winding. Continuous service is supported by a 100 % duty cycle, allowing the valve to remain energized indefinitely during machine cycles. Thermal endurance is indicated by a maximum coil temperature of 150 °C, giving margin under elevated ambient or oil temperatures. The housing carries an IP65 protection class, so sprayed water and dust cannot enter the electrical cavity. Installation is simplified by the ISO 4401-07-06-0-94 mounting interface, and the subplate weighs 13.4 kg, which guides lifting and manifold selection.

The hydraulic side of the 4WRZ16W8-150-7X/6EG24N9ETK4/D3M-674 handles main line pressures up to 350 bar, enabling it to control cylinders or motors in high-pressure circuits. Its nominal flow is 150 l/min at a 10 bar pressure drop, supporting medium-to-large actuators without excessive losses. All working and tank ports are sized at 20 mm, matching the flow rating and easing connection to standard piping. Pilot control is provided by a 3DREP 6 valve that shifts the main spool proportionally to the input signal. A Ø2.0 mm pilot throttle insert limits pilot flow to stabilize motion and reduce power consumption. The pilot supply pressure is preset by a pressure-reducing valve to 40 bar, giving a constant pilot force independent of main pressure changes. Pilot drain port Y may see up to 30 bar, so back-pressure in the return gallery is tolerated. The external drain on port T can handle 250 bar, allowing remote mounting of the drain line in systems with high return pressures.