4WEH10H4X/6EW110N9K4

The 4WEH10H4X/6EW110N9K4 directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It directs hydraulic flow in automated circuits. The valve uses a 4-way configuration to switch between supply, return, and two actuator lines. Its nominal size NG10 sets the mounting footprint and determines flow capacity for medium-duty systems. A mounting interface conforming to ISO 4401-05-05-0-05 simplifies block installation and ensures interchangeability. Coil voltage of 110 V AC at 50/60 Hz enables direct connection to common industrial mains for solenoid actuation. The electrical connection is realized with a DIN EN 175301-803 K4 plug, easing wiring in control cabinets. A concealed manual override coded N9 lets maintenance staff shift the spool during commissioning or power loss without exposing moving parts. Hydraulic spool return is used, so the valve resets without mechanical springs when the solenoid de-energizes. The pilot flow needed for the shortest switching time is 35 l/min, supporting rapid response in servo-controlled machinery.

System limits and operating conditions define performance for this valve. Maximum pressure of 350 bar at ports P, A, and B supports high-force actuators, while port T or external Y withstands up to 315 bar to manage return surges. Port Y for internal drainage in accumulator circuits is restricted to 160 bar to protect seals. A pilot stage accepts up to 250 bar, delivering stable actuation without overloading control lines. The permitted viscosity window from 2.8 to 500 mm²/s lets the valve handle thin start-up oils and thicker fluids at working temperature, while a hydraulic fluid range of -20 to +80 °C covers cold plants and heated presses. To prevent spool sticking and wear, system cleanliness must reach ISO 4406 20/18/15. These operating envelopes have been refined through Bosch Rexroth’s long experience in modular valve technology, allowing WEH units to fit mobile machinery and stationary industrial manifolds alike. Robust machining techniques used across the series maintain tolerance under cyclic loading, and standardized assembly points simplify service in the field. The company maintains global support channels so spare coils or seals can be sourced quickly.