Bosch Rexroth | H-4WEH25R6X6EW110N9ES2K4B10D3
H-4WEH25R6X/6EW110N9ES2K4/B10D3
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The H-4WEH25R6X/6EW110N9ES2K4/B10D3 directional spool valve is manufactured by Bosch Rexroth as part of the WEH Directional Spool Valves series and directs flow in hydraulic automation circuits. It features a nominal size 25 flow gallery that defines its rated passage area, and it uses the R spool form to establish the required flow paths between pressure and work ports. A subplate mounting interface simplifies installation, while the ISO 4401-10-09-0-05 porting pattern keeps the valve compatible with common manifold blocks. The assembly withstands operating pressures up to 350 bar, enabling service in high-pressure systems. Pilot oil is taken internally from the pressure gallery, and the spent pilot fluid is routed externally so backpressure does not affect actuation. A high-power 6E pilot control valve drives the main spool, providing consistent shifting force even under peak loads.
The pilot stage may be loaded to 250 bar, but when the d3 reducer is engaged the pressure is limited to 45 bar to match lower power requirements. Reliable movement of the spring-centered three-position version begins at 13 bar of pilot pressure, ensuring proportional response at low feed. A discharge-type S2 adjustment lets technicians trim switching time by venting pilot oil more quickly, and the Ø1.0 mm B10 throttle insert offers additional damping control when slower motion is desired. A concealed N9 manual override allows emergency shifting without exposing moving parts, and a DIN EN 175301-803 K4 plug supplies a standardized electrical connection for the pilot solenoid. Six M12 × 60 screws to ISO 4762 specifications secure the valve housing and resist vibration during pressure cycles.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (3-pos Spring-centered)
13 bar
Mounting Screws
6 × M12 × 60 (ISO 4762)
Mounting Type
Subplate
Nominal Size (ng)
25
Pilot Control Valve
6E (High-Power)
Pilot Oil Return
External
Pilot Oil Supply
Internal
Porting Pattern
ISO 4401-10-09-0-05
Reduced Pilot Pressure (d3)
45 bar
Spool Symbol
R
Switching Time Adjustment
Discharge (S2)
Throttle Insert
Ø1.0 mm (B10)
1620 Old Apex Road
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