Bosch Rexroth | H-4WEH25D6X6EG24N9EDK24L211B10D3
H-4WEH25D6X/6EG24N9EDK24L2/11B10D3
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The H-4WEH25D6X/6EG24N9EDK24L2/11B10D3 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is intended for electrically controlled flow direction in hydraulic automation. It uses electro-hydraulic actuation so an electrical signal shifts the spool through pilot oil pressure. A nominal size of 25 defines the flow section to match medium-capacity circuits, while the ISO 4401 porting pattern keeps the interface consistent with standard subplates. Subplate mounting simplifies replacement, and M12 × 60 screws of strength class 10.9 provide the clamping force needed to resist hydraulic loads. Pilot oil is supplied internally through port X, which removes the need for an external feed, and is returned externally through port Y to maintain low back-pressure in the pilot chamber. A hydraulic spool-return arrangement recenters the element when pilot pressure is released, and a 1.0 mm throttle insert in position B10 limits pilot flow for smoother shifting.
The main flow paths p, A, and B tolerate operating pressures up to 350 bar, allowing the valve to control high-pressure actuators. Port T is rated for 250 bar so tank lines can handle counterpressure without damage, and the external Y port can withstand 210 bar to protect the pilot drain circuit. A D3 pressure-reducing valve is integrated to stabilize pilot supply when system pressure fluctuates. Hydraulic fluid must meet ISO 4406 cleanliness class 20/18/15 to prevent spool sticking and wear. A maximum surface-coating thickness of 100 µm safeguards the housing against corrosion without obstructing mounting fits, and a mean time to dangerous failure of 100 years supports long service intervals in safety-related systems.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Control Spool Return
Hydraulic
Max Operating Pressure (p, A, B)
350 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (external)
210 bar
Mounting Screws
M12 x 60 (ISO 4762) 10.9
Mounting Type
Subplate
Mttfd (type Weh)
100 Years
Nominal Size (ng)
25
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (X)
Porting Pattern
ISO 4401
Pressure Reducing Valve
D3
Surface Coating Thickness
100 µm Max
Throttle Insert
Ø1.0 mm (B10)
1620 Old Apex Road
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