Bosch Rexroth | H-4WEH25E6X6EG24N9S2DK25L
H-4WEH25E6X/6EG24N9S2DK25L
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The H-4WEH25E6X/6EG24N9S2DK25L valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth and directs hydraulic flow in automated machinery. With a nominal size of NG25 it fits medium-capacity manifolds. The spool handles operating pressures up to 350 bar, and under symbol E conditions at that pressure a flow rate of 650 l/min is possible. The pilot stage accepts pressures up to 250 bar and needs at least 13 bar in a spring-centered setup to shift the spool. A pilot volume of 14.2 cm³ is displaced during each actuation. Oil viscosities from 2.8 mm²/s to 500 mm²/s are permitted, allowing use with a broad range of hydraulic fluids.
The unit works with fluid temperatures to 80 °C and withstands ambient temperatures to 50 °C. System oil must meet cleanliness class 20/18/15 per ISO 4406 to protect the precision spool lands. Installation follows the ISO 4401-08-08-0-05 mounting pattern, secured by four M12 × 60 screws that are tightened to 100 N·m. Surface coating is limited to 100 µm so the housing seats correctly on the sub-plate. When both solenoids are present the valve weighs 19.0 kg, a factor to consider for lifting and manifold support.
Technical Specifications
Ambient Temp Max (nbr)
+50 °C
Hydraulic Fluid Cleanliness Class
20/18/15 (ISO 4406)
Hydraulic Fluid Temp Max (nbr)
+80 °C
Max Flow (symbol E, 350 Bar)
650 l/min
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (3-pos Spring-centered)
13 bar
Mounting Pattern
ISO 4401-08-08-0-05
Mounting Screw Torque
100 Nm
Mounting Screws
M12 x 60 (ISO 4762)
Nominal Size
NG25
Pilot Volume (3-pos Spring-centered)
14.2 cm3
Surface Coating Thickness Max
100 µm
Valve Weight (two Solenoids)
19.0 kg
Viscosity Max
500 mm2/s
Viscosity Min
2.8 mm2/s
1620 Old Apex Road
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