4WEH10H4X/6EG24N9K4

The 4WEH10H4X/6EG24N9K4 directional spool valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series, and it directs pressurized fluid to actuators in hydraulic automation circuits. The valve uses a 4-way flow path so it can alternately connect pressure, tank, and two work ports for bidirectional cylinder movement. Its nominal size is NG10, matching subplates that carry medium flow rates in industrial power units, and it supports a maximum flow of 160 l/min to handle rapid actuator speeds without excessive pressure loss. Installation is on an ISO 4401-05-05-0-05 mounting interface, ensuring compatibility with standardized manifolds. Pilot shifting is accomplished by a high-power 4WE 6E pilot valve that boosts switching force for reliable movement under full system pressure. Pilot oil is supplied internally while the return is routed externally so designers can separate pilot and main flows and minimize heat generation. The pilot stage tolerates pressures up to 250 bar, providing a safety margin for common industrial pump settings.

The integral solenoid in the pilot stage operates at 24 V DC, supporting direct connection to machine controls without step-down transformers. Electrical termination is made through a DIN EN 175301-803 K4 connector, which provides a sealed plug-in interface for quick replacement. A concealed N9 manual override permits local actuation during commissioning while preventing accidental operation once the cover is in place. The main spool is returned hydraulically instead of by a spring, which stabilizes shifting when back pressure fluctuates. Working ports P, A, and B can be loaded up to 350 bar, allowing the valve to control high-force cylinders, while the tank port withstands 315 bar so back pressure in return lines does not risk internal leakage. The y drain port is limited to 210 bar in DC operation, defining the allowable pressure for external pilot drainage circuits. Fluid cleanliness should meet ISO 4406 class 20/18/15 to prevent spool sticking and premature wear.