4WRH16W6-150-7X//M

The 4WRH16W6-150-7X//M proportional directional valve is produced by Bosch Rexroth within the WRZ Proportional Directional Valves series. It modulates flow and direction of pressure-balanced mineral oil in hydraulic automation circuits. The nominal size is 16, providing a footprint suitable for medium-capacity manifolds. At a pressure drop of 10 bar the valve passes a nominal flow of 150 l/min, giving repeatable cylinder or motor speeds. The main stage withstands 350 bar, so it can sit directly on high-pressure supply lines without a separate pressure reducer. Mineral oil of the HL or HLP classes to DIN 51524 is the approved working fluid, ensuring stable viscosity and seal life. Installation is through the ISO 4401-07-06-0-94 interface, which matches standard CETOP 07 subplates. All working ports measure 20 mm in diameter, and acceptable fluid cleanliness is limited to 20/18/15 according to ISO 4406.

Peak demands are handled by a maximum flow capability of 460 l/min, allowing rapid actuator movement during large-stroke operations. The pilot stage receives oil from an external supply at port X, and this control pressure may rise to 25 bar without affecting spool stability. Surplus pilot oil leaves through external drain Y, where a drain line pressure of about 30 bar maintains a consistent bias across the control piston. The return port t tolerates 250 bar, letting the valve operate in circuits with elevated back pressure such as regenerative drives. Dynamic movement is further supported by NBR seals that resist the approved mineral oils while keeping internal leakage low. By combining external pilot paths with high back-pressure capability, the 4WRH16W6-150-7X//M suits closed-loop proportional control tasks in presses, molding machines, and other automated hydraulic equipment.