H-4WEH25C6X/OF6EW110N9TK4

The H-4WEH25C6X/OF6EW110N9TK4 directional valve is built by Bosch Rexroth within the WEH Directional Spool Valves series. It directs pressure and flow in automated hydraulic circuits where electrical signals must quickly reposition a large spool. Electro-hydraulic actuation converts coil energy into pilot oil movement so the main spool shifts without high inrush current. Valve size NG25 establishes a passage area suited to medium-to-high flow machines, while the 4-way 4/2 function provides two discrete positions for supply, pressure and return routing. The spool designated by symbol C sets the connection pattern when the valve is energized or de-energized. A 4WE 6 high-power pilot stage delivers sufficient pilot flow, and external pilot oil supply at port X keeps the control oil free from load-induced pressure spikes. After shifting, an internal pilot oil return to port T vents the pilot circuit to tank, and a hydraulic spring package returns the main spool to its rest position when the coil is de-energized.

Working ports P, A and B can be loaded to 350 bar, allowing the valve to fit high-pressure mobile or industrial systems. The pilot circuit tolerates up to 250 bar and still opens reliably with a minimum pilot pressure of 8 bar, while port T withstands 250 bar so back-pressure from downstream equipment does not force leakage. A concealed manual override designated N9 lets maintenance staff shift the valve locally without disturbing electrical control. The plug in accordance with DIN EN 175301-803 K4 standardizes the electrical interface for the solenoid coil. Hydraulic oil cleanliness must reach ISO 4406 (c) 20/18/15 to preserve spool clearances and pilot orifices. Mounting follows the ISO 4401-08-08-0-05 pattern, ensuring the unit drops onto common NG25 manifolds. These parameters complete the operating envelope and confirm suitability for automated presses, plastic injection machines, or any installation that demands rapid, repeatable directional control at high pressure.