Bosch Rexroth | H-4WEH25D6XEW110N9DALB10D3-SO388
H-4WEH25D6X/EW110N9DAL/B10D3 SO388
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The H-4WEH25D6X/EW110N9DAL/B10D3 SO388 directional spool valve belongs to the WEH Directional Spool Valves series manufactured by Bosch Rexroth. Designed for hydraulic automation circuits, this NG25 unit is installed on a subplate that follows the ISO 4401-08-08-0-05 porting pattern to standardize manifold layouts. An internal pilot oil supply labeled E feeds the control stage, while pilot oil is returned externally through port Y to prevent cross-port pressure buildup. The main flow paths p, a, and b tolerate operating pressures up to 350 bar, and the tank port T withstands 250 bar during relief conditions. A secondary pressure setting identified as D3 limits auxiliary lines to 45 bar. Flow can be restricted with a 1.0 mm throttle insert when needed for metering. System reliability is supported by a fluid cleanliness requirement of ISO 4406 20/18/15 to protect the spool and seat surfaces from abrasion.
Mechanical attachment of the valve uses six M12 × 60 mounting screws specified by ISO 4762, each tightened to 100 Nm to maintain seal integrity against the subplate. The component’s protective surface coating is applied to a maximum thickness of 100 µm to resist corrosion without interfering with fit in compact manifolds. A calculated mean time to dangerous failure of 100 years (Mttfd) characterizes the functional safety expectation for the WEH design. The overall assembly therefore offers long service life with standard fasteners and moderate coating build, aligning with the series focus on robust, high-pressure directional control.
Technical Specifications
D3 Secondary Pressure
45 bar
Fluid Cleanliness Class
ISO 4406 20/18/15
Max Operating Pressure (p/a/b)
350 bar
Max Pressure (tank Port T)
250 bar
Mounting
Subplate
Mounting Screw Quantity
6
Mounting Screw Size
M12 x 60 (ISO 4762)
Mttfd (type Weh)
100 years
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (E)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
Size
NG25
Surface Coating Thickness
100 µm Max
Throttle Insert Diameter
1.0 mm
1620 Old Apex Road
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