4WEH16H7X/6EG24N9TK4/V

The 4WEH16H7X/6EG24N9TK4/V valve is part of the WEH Directional Spool Valves series from Bosch Rexroth and is installed to direct flow in automated hydraulic circuits. It mounts as an NG16 unit that matches the ISO 4401-07-07-0-05 porting pattern, so it fits standard manifold blocks without adapter plates. Energizing the solenoid with a 24 V DC coil shifts the spool, while a DIN EN 175301-803 plug labeled K4 provides a sealed electrical interface for field wiring. A concealed manual override identified as N9 permits local actuation when power is absent but keeps the housing profile unchanged during normal service. The valve uses an external pilot supply through port X and returns pilot oil internally to port T, reducing external lines yet preventing load-induced pressure from influencing the control circuit. For a three-position spring-centered spool the pilot chamber volume is 5.72 cm³, a figure that defines the response time of the control stage. Proper operation requires hydraulic fluid cleanliness no worse than class 20/18/15 per ISO 4406 to protect the precision-ground spool and body.

Performance limits allow the H-symbol spring-centered spool to pass up to 300 l/min, enabling high-flow actuators to work without excessive pressure drop. Main ports P, A, and B withstand continuous pressures to 280 bar, while the pilot circuit may be supplied up to 250 bar, so the control stage remains stable even in high system pressure conditions. Tank port T tolerates 210 bar in internal return configuration for direct current operated versions, preventing cavitation when backpressure rises. A minimum pilot pressure of 14 bar is needed to overcome spring forces and shift the spool reliably in three-position service. Hydraulic fluid may range from −15 °C up to +80 °C when FKM seals are used, covering cold starts and elevated oil temperatures common in mobile or industrial equipment. These operating ranges, together with the flow capability and pressure ratings mentioned above, define how the valve integrates into closed-loop or open-loop automation schemes that require dependable directional control.