Bosch Rexroth | H-4WEH25E6X6EW110N9EDALB10D3
H-4WEH25E6X/6EW110N9EDAL/B10D3
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The H-4WEH25E6X/6EW110N9EDAL/B10D3 directional spool valve is produced by Bosch Rexroth as part of the WEH Directional Spool Valves series and is intended for routing pressure and return lines in automated hydraulic machinery. It follows the ISO 4401-08-08-0-05 porting pattern so it fits standard subplates, and its nominal size of NG25 establishes the flow section required for medium-to-large actuators. A 4-way body offers separate paths for pressure, tank, and two work ports, while a 3-position spool handles advance, neutral, and retract states. Continuous service up to 350 bar on ports p, a, and b allows operation in high-pressure circuits. The acceptable fluid viscosity range of 2.8 to 500 mm²/s supports a wide selection of hydraulic oils, and a temperature window of −20 to +80 °C maintains reliable sealing. The two-solenoid, spring-centered version weighs 19.0 kg, providing enough mass for stable mounting without extra brackets.
The valve passes up to 650 l/min with the E spool symbol at 350 bar, enabling rapid actuator movement in high-flow systems. Internal pilot oil supply draws control pressure directly from the main line, while external pilot oil return routes pilot flow to tank to avoid back-pressure. The pilot stage tolerates up to 250 bar and remains centered by springs until 13 bar is reached, defining the minimum pilot pressure for a dependable shift. A built-in pressure-reducing valve limits pilot supply to 45 bar to protect the solenoids and control passages. A 1.0 mm throttle insert in the B10 version dampens pressure spikes for smoother transitions. A concealed manual override allows maintenance personnel to actuate the spool during setup without exposing the mechanism to contaminants. These features support precise motion control and pressure management in demanding hydraulic installations.
Technical Specifications
Fluid Temperature Range
–20 to +80 °C
Manual Override
Concealed
Max Flow (symbol E, 350 Bar)
650 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (spring-centered)
13 bar
Nominal Size
NG25
Pilot Oil Return
External
Pilot Oil Supply
Internal
Porting Pattern
ISO 4401-08-08-0-05
Pressure Reducing Valve Output
45 bar (D3)
Spool Positions
3
Throttle Insert
Ø1.0 mm (B10)
Viscosity Range
2.8 to 500 mm2/s
Way Configuration
4-way
Weight (2-solenoid, Spring-centered)
19.0 kg
1620 Old Apex Road
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