Bosch Rexroth | H-4WEH25J6X6EW110N9K4B08
H-4WEH25J6X/6EW110N9K4/B08
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The H-4WEH25J6X/6EW110N9K4/B08 valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and is intended to route hydraulic flow in automated machinery. Actuation is electro-hydraulic, so an electrical pilot shifts the spool for remote control. Its 4/3-way configuration with symbol J lets the operator connect pressure to either work port or unload all ports to tank. The valve is built in size NG25, providing passage dimensions for medium-capacity circuits. A porting pattern that follows ISO 4401 makes it compatible with standard subplates. Pilot oil is taken internally through port X, which removes the need for an external pilot supply line. The assembly tolerates a maximum operating pressure of 350 bar, allowing use in high-pressure presses and clamping systems. A required fluid cleanliness level of ISO 4406 20/18/15 limits particulate wear on the spool lands, and a minimum fluid viscosity of 2.8 mm²/s is necessary to maintain lubrication during cold starts.
Hydraulic fluid may operate between −20 °C and +80 °C, so the spool clearance stays within design limits across oil temperature extremes. The surrounding ambient can range from −20 °C to +50 °C, permitting installation on equipment exposed to seasonal weather changes. Mounting is secured by six M12 × 60 screws, and each fastener must be torqued to 100 Nm ±10 % to seal the subplate interface. Functional safety is supported by an MTTFd of 100 years, indicating a low probability of dangerous failure during normal duty. Maximum permissible fluid viscosity is 500 mm²/s, which allows reliable shifting when cold or heavy oil is present. These limits define the mechanical and environmental envelope needed for dependable directional control in automated hydraulic systems.
Technical Specifications
Actuation
Electro-Hydraulic
Ambient Temp Max (nbr)
+50 °C
Ambient Temp Min (nbr)
-20 °C
Cleanliness Class
ISO 4406 (c) 20/18/15
Directional Function
4/3-Way (Symbol J)
Hydraulic Fluid Temp Max (nbr)
+80 °C
Hydraulic Fluid Temp Min (nbr)
-20 °C
Max Operating Pressure
350 bar
Mounting Screws
6x M12 x 60
Mttfd (type Weh)
100 years
Pilot Oil Supply
Internal (X)
Porting Pattern
ISO 4401
Screw Torque
100 Nm (+/-10%)
Size
NG25
Viscosity Max
500 mm2/s
Viscosity Min
2.8 mm2/s
1620 Old Apex Road
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