Bosch Rexroth | H-4WEH25R6X6EW110N9TDAL10N10
H-4WEH25R6X/6EW110N9TDAL/10N10
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The H-4WEH25R6X/6EW110N9TDAL/10N10 is manufactured by Bosch Rexroth and belongs to the WEH Directional Spool Valves series, where it directs hydraulic flow in automated circuits through electro-hydraulic actuation. Valve size NG25 (W.H 25) matches the ISO 4401-10-09-0-05 manifold pattern so the body fits standard subplates without adapters. Its 4-way configuration establishes four flow paths that reverse cylinder or motor movement as required. Electro-hydraulic actuation converts an electrical pilot signal into hydraulic force to shift the spool. A control spool stroke of 12.5 mm opens the ports fully, while a maximum operating pressure of 350 bar permits use on high-pressure main lines. The R-symbol flow rating of 580 l/min at 350 bar accommodates large volume demands, and a pilot flow of 35 l/min achieves the shortest switching time. Pilot oil is supplied externally on port X with an internal return to tank through port T, separating pilot flow from the main circuit.
Maximum pilot pressure is limited to 250 bar to protect the pilot stage, and internal port Y can withstand up to 160 bar so return flow does not over-pressurize the drain gallery. Fluid cleanliness must reach class 20/18/15 per ISO 4406, ensuring the spool and seats remain free of abrasive contamination. Installation uses four M12 × 60 screws in accordance with ISO 4762, each tightened to 100 Nm to hold the valve securely against the subplate sealing faces. The assembly weighs 19.0 kg when both solenoids are fitted, a consideration for lifting and support hardware. With a mean time to dangerous failure of 100 years under EN ISO 13849, the unit provides a long functional safety interval for critical hydraulic control loops.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class (iso 4406)
20/18/15
Control Spool Stroke
12.5 mm
Max Flow (symbol R, 350 Bar)
580 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Port Y Pressure (internal, Ac)
160 bar
Mounting Screws
M12 x 60 (ISO 4762)
Mttfd (en Iso 13849)
100 years
Pilot Flow For Shortest Switching Time
35 l/min
Pilot Oil Supply
X External; Return Internal (T)
Porting Pattern
ISO 4401-10-09-0-05
Screw Tightening Torque
100 Nm
Valve Size
NG25 (W.H 25)
Way Configuration
4-Way
Weight (two Solenoids)
19.0 kg
1620 Old Apex Road
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