Bosch Rexroth | H-4WEH25E6X6EW110N9DAB10D3
H-4WEH25E6X/6EW110N9DA/B10D3
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The H-4WEH25E6X/6EW110N9DA/B10D3 directional spool valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth for hydraulic automation. It routes pressurized oil to actuators or returns fluid to tank in response to pilot signals. The nominal size NG25 defines the flow section and matches common manifold cavities in this class. An ISO 4401-08-08-0-05 porting pattern provides standardized interface dimensions for subplate mounting. Secure installation is achieved with six M12 × 60 screws specified for the housing. Ports P, A, and B tolerate up to 350 bar, allowing the valve to operate in high-pressure circuits. The E-spool passes a maximum of 650 l/min at 350 bar to support high flow demand. The internal pilot stage needs a minimum of 4.5 bar to shift the spool.
Fluid cleanliness must reach class 20/18/15 according to ISO 4406 so that the valve surfaces remain free of abrasive particles. When an external pilot supply is used the spool shifts once pressure reaches at least 13 bar, while the pilot passages must stay below 250 bar to avoid overstressing the control components. Port Y on an AC coil withstands up to 160 bar, giving flexibility in back-pressure conditions. The three-position design displaces 14.2 cm³ of pilot oil during each movement. A built-in pressure reducing valve holds the pilot line at 45 bar for consistent actuation. A 1.0 mm throttle insert further dampens pilot flow to improve control stability. Statistical reliability is indicated by an MTTFd of 100 years, supporting long service intervals.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Max Flow (e Spool @ 350 Bar)
650 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Max Pressure (port Y, Ac Coil)
160 bar
Min Pilot Pressure (x External)
13 bar
Min Pilot Pressure (x Internal)
4.5 bar
Mounting Screw Quantity
6
Mounting Screw Size
M12 x 60
Mttfd (type Weh)
100 years
Pilot Volume (3-position)
14.2 cm3
Porting Pattern
ISO 4401-08-08-0-05
Pressure Reducing Valve Setpoint
45 bar
Size
NG25
Throttle Insert Diameter
1.0 mm
1620 Old Apex Road
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