Bosch Rexroth | H-4WEH25D6X6EW110N9ETK4B10D3
H-4WEH25D6X/6EW110N9ETK4/B10D3
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The H-4WEH25D6X/6EW110N9ETK4/B10D3 valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series and is used to shift hydraulic flow paths in automated machinery. Its nominal size is NG25, giving passage dimensions suited to mid-range flow rates common in industrial power units. The valve withstands operating pressures up to 350 bar on ports P, A, and B, so it can sit directly in high-pressure circuits without separate relief devices. Fluid viscosities from 2.8 mm²/s to 500 mm²/s are accepted, allowing operation with thin mineral oils or thicker fluids at cold start. A maximum fluid temperature of 80 °C keeps seal materials within their thermal limits. Pilot oil for both supply and return is routed internally, eliminating external pilot lines. A concealed manual override lets maintenance staff shift the spool during commissioning or power loss while protecting the mechanism from dirt. A 1.0 mm throttle insert orifice moderates pilot flow to prevent shock during actuation.
The pilot stage tolerates pressures up to 250 bar, yet it only requires 13 bar to move the spool in two-position spring-end versions, ensuring reliable switching even on low-pressure pilot circuits. Cleanliness class ISO 4406 20/18/15 is specified to limit particle contamination that could score the spool or jam control edges. Electrical connection follows DIN EN 175301-803, so a standard rectangular plug can be fitted without custom wiring. The mounting interface is ISO 4401-08-08-0-05, allowing the valve to bolt onto common subplates. Six M12 × 60 screws to ISO 4762 secure the body, and each screw must be tightened to 100 Nm to maintain sealing under load. The mean time to dangerous failure (Mttfd) is rated at 100 years, indicating a long functional safety life in properly filtered hydraulic systems.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection Standard
DIN EN 175301-803
Manual Override
Concealed
Max Fluid Temperature
80 C
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Viscosity
500 mm2/s
Min Pilot Pressure (2-pos Spring End)
13 bar
Min Viscosity
2.8 mm2/s
Mounting Interface
ISO 4401-08-08-0-05
Mounting Screws
6x M12 x 60 (ISO 4762)
Mttfd
100 years
Nominal Size
NG25
Pilot Oil Supply/return
Internal/Internal
Screw Tightening Torque
100 Nm
Throttle Insert Orifice
1.0 mm
1620 Old Apex Road
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