Bosch Rexroth | H-4WEH25HD6XOF6EW110N9TK4
H-4WEH25HD6X/OF6EW110N9TK4
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The H-4WEH25HD6X/OF6EW110N9TK4 valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series and directs hydraulic flow in automated equipment. It carries nominal size NG25 for high-volume passages and handles up to 700 l/min of oil. A porting pattern of ISO 4401-08-08-0-05 mates with standard subplates, and the subplate mounting style permits quick replacement. Four M12 × 60 ISO 4762 screws secure the body; they are tightened to 100 Nm to seal the interface. The valve is installed horizontally so the spool and pilot passages stay aligned. Contamination must not exceed ISO 4406 (c) 20/18/15 to protect sliding surfaces. Pilot oil is supplied through an external X line, and the return is routed internally to port T, which simplifies external piping.
The hydraulic work ports withstand operating pressures up to 350 bar, while port T tolerates back pressure as high as 250 bar without damaging seals. The pilot stage functions with supply pressures from 8 bar to 250 bar, giving reliable actuation over a wide control range. System designers must keep the hydraulic fluid below 80 °C and ambient air below 50 °C so elastomers and magnetic components maintain their rated life. These thermal limits, combined with the pressure capacities described, define the operating envelope for stable service. Together, the pressure, temperature, and cleanliness requirements ensure long-term spool guidance accuracy and predictable switching times under demanding industrial duty.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Installation Position
Horizontal
Max Ambient Temperature
50 °C
Max Flow Rate
700 l/min
Max Hydraulic Fluid Temp
80 °C
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pressure Port T
250 bar
Min Pilot Pressure
8 bar
Mounting Screw Torque
100 Nm
Mounting Screws
M12 x 60 (ISO 4762)
Mounting Type
Subplate
Nominal Size
NG25
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Porting Pattern
ISO 4401-08-08-0-05
1620 Old Apex Road
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