Bosch Rexroth | H-4WEH25R6X6EG24N9ETSK4B10D3
H-4WEH25R6X/6EG24N9ETSK4/B10D3
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The H-4WEH25R6X/6EG24N9ETSK4/B10D3 is a directional spool valve from Bosch Rexroth in the WEH Directional Spool Valves series. It routes pressurized fluid in automated hydraulic systems by using electro-hydraulic actuation, where a 24 V DC coil energizes a pilot stage that shifts the main spool. The 4/3-way configuration offers three functional positions to manage flow between four service ports, and the R spool symbol identifies the specific port connections assigned to each position. A valve size of NG25 permits a maximum flow of 1100 l/min while maintaining stable performance. Working ports P, A, and B withstand operating pressures up to 350 bar so the unit can be installed in high-pressure circuits. A concealed manual override labeled N9 provides mechanical shifting when electrical power is unavailable.
For pilot control, the internal oil supply and return paths marked ET remove the need for external pilot lines; the pilot stage accepts pressures up to 250 bar and requires at least 13 bar to re-center the spring-loaded spool. Installation on manifolds follows the ISO 4401 interface, secured by four M12 × 60 screws that conform to ISO 4762. These screws must be tightened to 100 Nm to keep the valve seated against the block without distortion. With two solenoids and a spring-centered design, the assembly weighs 19.0 kg, which should be considered when handling or mounting the valve.
Technical Specifications
Actuation
Electro-Hydraulic
Bolt Tightening Torque
100 Nm
Coil Voltage
24 V DC (G24)
Manual Override
Concealed (N9)
Max Flow
1100 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (spring-centered)
13 bar
Mounting Bolts
M12 × 60 (ISO 4762)
Mounting Interface
ISO 4401
Pilot Oil Return
Internal (ET)
Pilot Oil Supply
Internal (ET)
Spool Symbol
R
Valve Size
NG25 (W.H 25)
Valve Weight (2 Solenoids, Spring-centered)
19.0 kg
Way Configuration
4/3-Way
1620 Old Apex Road
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