4WRZ16E150-7X/6EG24N9EK4/V

The 4WRZ16E150-7X/6EG24N9EK4/V proportional directional valve is produced by Bosch Rexroth in the WRZ Proportional Directional Valves series. It directs hydraulic flow in automated systems where variable positioning and speed control are required. The unit delivers a nominal flow of 150 l/min when the pressure drop across the metering edge is 10 bar, allowing medium-size actuators to move at regulated speeds. A maximum operating pressure of 350 bar permits use on high-pressure supply lines without additional pressure-reducing devices. The housing follows the ISO 4401-07-06-0-94 porting pattern so it fits standard subplates. Electrical actuation is provided by a coil that shows 4.8 Ω resistance at 20 °C and accepts up to 1.5 A, while withstanding temperatures up to 150 °C during continuous duty. Connection to the machine harness is made with a DIN EN 175301-803 plug, and an IP65 enclosure rating protects internal parts against dust and low-pressure water jets. These features integrate the valve into harsh industrial environments with consistent electrical performance.

The control loop benefits from a maximum hysteresis of 6 %, which limits the difference between command and actual spool position during repetitive cycles. Pilot stages demand only 5.5 l/min of oil for a 0–100 % travel step, and the associated 4.6 cm³ volume keeps response times short while minimizing energy loss. The main flow path tolerates return port pressures up to 250 bar, whereas the separate Port Y drain line must stay below 30 bar to prevent counterforces on the spool. Contamination limits are defined at ISO 4406 20/18/15 for the main stage and ISO 4406 18/16/13 for the pilot stage, indicating stricter cleanliness for the finer control orifices. A total mass of 13.4 kg supports rigid mounting without additional reinforcement but still allows manual installation. Together these parameters give predictable dynamic behavior, protect internal clearances from premature wear, and match the valve to closed-loop hydraulic axes that rely on precise proportioning of flow and pressure.