Bosch Rexroth | H-4WEH25G6X6EW110N9DA
H-4WEH25G6X/6EW110N9DA
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The H-4WEH25G6X/6EW110N9DA valve is part of the WEH Directional Spool Valves series from Bosch Rexroth and is used to route pressurized fluid in automated hydraulic circuits. Electro-hydraulic actuation permits remote electrical control while a pilot stage converts the signal into hydraulic movement. The nominal size NG25 matches medium-to-large flow passages in standard manifolds, and the G spool symbol defines the internal metering lands for the selected circuit function. A maximum flow rate of 400 l/min supports high-volume systems, and the valve withstands 350 bar at ports P, A, and B to operate in high-pressure lines. The assembly weighs 19.0 kg with two solenoids, a factor considered when planning support brackets. Subplate mounting speeds replacement without disturbing pipework, and the ISO 4401-08-08-0-05 porting pattern aligns the pressure and work ports with common manifold layouts.
External pilot oil supply at port X separates control flow from the main circuit to keep actuation stable. Pilot pressure may rise to 250 bar, yet reliable shifting begins at 13 bar, so the control loop can use low auxiliary pressure if desired. Port T carries return flow and is rated to 250 bar, allowing the tank line to handle back-pressure without damage. Cleanliness must not exceed ISO 4406 (c) 20/18/15 to protect the precision spool fit. A surface coating up to 100 µm thick guards exposed metal from corrosion in humid environments, and an MTTF d of 100 years indicates a long statistical life for safety-related assessments. Mounting screws sized M12 require 100 Nm of torque to secure the valve and maintain the sealing interface under dynamic pressure load.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
ISO 4406 (c) 20/18/15
Max Flow (symbol G)
400 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (x External)
13 bar
Mounting
Subplate
Mounting Screw Torque (m12)
100 Nm
Mttfd
100 years
Nominal Size
NG25
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
Spool Symbol
G
Surface Coating Max Thickness
100 µm
Weight (2 Solenoids)
19.0 kg
1620 Old Apex Road
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