Bosch Rexroth | H-4WEH25HD6XOF6EG24N9ETS2K4B10D3
H-4WEH25HD6X/OF6EG24N9ETS2K4/B10D3
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The H-4WEH25HD6X/OF6EG24N9ETS2K4/B10D3 valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. It is used in hydraulic automation to shift flow paths between pressure, tank, and actuator lines. A 4-way spool provides the required port interconnection for bidirectional cylinder or motor control, and the NG25 nominal size defines the passage dimensions for medium-flow systems. The ISO 4401-08-08-0-05 porting pattern matches standard subplates for quick installation. Electro-hydraulic actuation moves the spool by energizing a 24 V DC solenoid, while a DIN EN 175301-803 (K4) plug supplies the electrical interface. When manual intervention is needed, a concealed N9 override permits direct spool movement without external projections. Hydraulic return of the control spool brings it back to center once pilot pressure is released. Both pilot oil supply and pilot oil return are internal (ET), so external pilot lines are not required.
System operating limits reach 350 bar, allowing the valve to function in high-pressure circuits. Pilot control is rated up to 250 bar but can be initiated at only 8 bar on a two-spool arrangement with hydraulic end positioning, enabling reliable shifting at low standby pressure. A secondary pilot line can be stabilized at 45 bar to maintain consistent actuation force under varying loads. Discharge Control S2 switching-time adjustment lets the user fine-tune opening and closing speed to match machine cycle requirements, and a Ø 1.0 mm B10 throttle insert further damps flow in the pilot stage to prevent pressure shocks during rapid shifts. These pressure limits and timing options combine to give the valve predictable performance across a broad range of hydraulic automation tasks without additional external components.
Technical Specifications
Actuation Type
Electro-Hydraulic
Coil Voltage
24 V DC
Control Spool Return
Hydraulic
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (2-spool, Hyd. End Pos)
8 bar
Nominal Size
NG25
Pilot Oil Return
Internal (ET)
Pilot Oil Supply
Internal (ET)
Pilot Pressure (d3) Secondary
45 bar
Porting Pattern
ISO 4401-08-08-0-05
Switching Time Adjustment
Discharge Control (S2)
Throttle Insert
Ø 1.0 mm (B10)
Way Configuration
4-way
1620 Old Apex Road
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