Bosch Rexroth | H-4WEH25F6X6EG24N9S2K4
H-4WEH25F6X/6EG24N9S2K4
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The H-4WEH25F6X/6EG24N9S2K4 belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for automated hydraulic control. It uses a 4/3-way spool arrangement to route pressure and return lines or to block flow when centered. The nominal size NG25 sets the mounting footprint and determines the flow capacity that the subplate must accommodate. Electro-hydraulic actuation enables the main spool to shift by means of pilot pressure after an electrical command. A high-power 6E pilot control valve supplies the pilot flow required for fast response. The solenoid operates on 24 V DC so it matches common machine control voltages. Wiring is completed through a DIN EN 175301-803 K4 connector, which provides standardized pin assignment and sealing. A concealed manual override identified as N9 allows manual shifting during commissioning or in case of power loss. The mean time to dangerous failure is specified at 100 years, offering a long safety lifecycle for continuous-duty systems.
The valve withstands operating pressures up to 350 bar at ports P, A, and B, permitting use in high-pressure hydraulic circuits. With spool F at that pressure, it carries a maximum flow of 300 l/min, enabling supply to large cylinders or motors without excessive pressure drop. Pilot oil is supplied externally through port X, isolating the pilot stage from load-induced pressure spikes in the main lines. Pilot oil returns externally through port Y, so back pressure from the tank line does not affect the pilot spool. The pilot return path can tolerate up to 210 bar DC, allowing installation where return pressure may rise significantly. Pilot operation requires at least 13 bar and may reach 250 bar, defining the acceptable control pressure window for reliable switching. The mounting interface follows ISO 4401-08-08-0-05, ensuring interchangeability with standard NG25 subplates in modular manifold systems.
Technical Specifications
Actuation
Electro-Hydraulic (WEH)
Coil Voltage
24 V DC
Electrical Connector
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (spool F, 350 Bar)
300 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure
13 bar
Mttfd
100 years
Nominal Size
NG25
Pilot Control Valve
6E (High-Power)
Pilot Oil Return
External (Y)
Pilot Oil Supply
External (X)
Pilot Return (y) Max Pressure
210 bar (DC)
Porting Pattern
ISO 4401-08-08-0-05
Valve Type
4/3-Way
1620 Old Apex Road
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