4WEH10E4X/6EW110N9ETK4/B10

The 4WEH10E4X/6EW110N9ETK4/B10 directional spool valve is built by Bosch Rexroth within the WEH Directional Spool Valves series. It directs flow in hydraulic automation circuits where dependable switching between actuator ports is required. The unit follows the NG10 size code, so it fits subplates drilled to that envelope. A 4-way channel layout supplies pressure, two work ports, and a tank return to support double-acting cylinders. The porting pattern matches ISO 4401-05-05-0-05, which simplifies manifold integration across equipment. Working ports can be pressurized up to 280 bar, allowing service in medium-pressure power packs. Acceptable oil viscosity spans 2.8 to 500 mm²/s, so common mineral and synthetic fluids can be used without loss of response. Operation remains stable from −20 °C to +80 °C fluid temperature, covering typical mobile and industrial environments. Contamination must not exceed ISO 4406 class 20/18/15 to protect internal metering edges, and the assembled valve weighs 6.8 kg for manageable handling during installation.

A DIN EN 175301-803 K4 connector provides the electrical interface to the solenoids, ensuring quick field wiring and standardized sealing. A concealed manual override lets maintenance staff shift the spool without energizing the coils while guarding against accidental actuation during service. Pilot control circuits may reach 250 bar, yet the solenoid starts to move the spool once 12 bar is available, so low-pressure pilot stages are possible. Internal pilot return is rated for 160 bar, supporting remote venting where tank lines carry back pressure. A fixed orifice of 1.0 mm can be installed as a throttle insert to tailor switching speed and damp pressure shocks. Proper clamping to the subplate requires mounting screws tightened to 12.5 Nm to avoid distortion of the sealing surfaces.