4WEH10EA4X/6EW110N9EK4/B10V

The 4WEH10EA4X/6EW110N9EK4/B10V valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and directs hydraulic flow in automated systems where electrical signals must initiate pressure-tight switching. Actuation is electro-hydraulic, so a solenoid energizes a pilot stage that shifts the main spool with hydraulic force. The spool follows symbol E, establishing the required flow paths in neutral and actuated positions. A nominal size of NG10 defines the port geometry for medium-capacity circuits, and ports P, A, and B tolerate operating pressures up to 280 bar, allowing the valve to sit in high-pressure manifolds. Pilot oil is taken internally from the pressure gallery, eliminating separate supply plumbing, while the drained pilot oil leaves through an external Y port to avoid housing backpressure. The interface follows porting pattern ISO 4401-05-05-0-05, so the body mounts on standard subplates, and electrical power reaches the solenoid through a DIN EN 175301-803 K4 connector that supports quick exchange during maintenance.

The pilot stage itself withstands 250 bar, setting the upper limit for the control circuit, and the tank port T accepts 280 bar when the external Y return is used, letting designers route flow through long return lines without cavitation. The dedicated Y drain line is limited to 160 bar, ensuring the pilot exhaust remains stable. A 1.0 mm throttle insert labeled B10 is fitted in the pilot gallery to meter flow and damp spool movement. A concealed manual override coded N9 sits beneath a sealing cap so technicians can shift the valve during commissioning without exposing moving parts. FKM seals identified by suffix V resist high temperatures and aggressive media, maintaining integrity over extended duty cycles. Hydraulic oil must meet cleanliness class ISO 4406 20/18/15 to protect the precision spool lands, and the design achieves an MTTFd of 100 years, indicating low statistical risk of dangerous failure in safety-related applications.