Bosch Rexroth | H-4WEH25D6X6EW110N9K4
H-4WEH25D6X/6EW110N9K4
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The H-4WEH25D6X/6EW110N9K4 spool valve is part of the WEH Directional Spool Valves series from Bosch Rexroth and directs hydraulic flow in automated systems. It is a 4-way unit in nominal size NG25, so it handles circuits that require simultaneous connection of pressure, tank, and two actuator lines. Mounting onto a manifold follows porting pattern ISO 4401-08-08-0-05 and is secured with six M12 × 60 screws. The valve’s flow capacity reaches 650 l/min when symbol D is operated at 350 bar while the pressure at ports P, A, and B can be held continuously at 350 bar. Electrical actuation is provided through a DIN EN 175301-803 K4 connector, and a concealed manual override identified as N9 permits local shifting without energizing the coil.
In pilot operation, the control stage tolerates up to 250 bar while the return path to internal port Y accepts 160 bar, and external port T can be pressurized to 250 bar. Two-spool switching begins once a minimum pilot pressure of 13 bar is available, moving 28.4 cm³ of oil during each shift. The design requires fluid cleanliness of ISO 4406 class 20/18/15 to maintain sealing and spool accuracy, and its corrosion protection is limited to a surface coating thickness of 100 µm. The mean time to dangerous failure for the WEH type reaches 100 years, indicating long functional reliability in properly maintained hydraulic automation systems.
Technical Specifications
Electrical Connection
DIN EN 175301-803 (K4)
Hydraulic Fluid Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Flow (symbol D, 350 Bar)
650 l/min
Max Operating Pressure (p,a,b)
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y Internal, Ac)
160 bar
Max Pressure (t, Y External)
250 bar
Min Pilot Pressure (2-spool)
13 bar
Mounting Screws
6x M12 x 60
Mttfd (type Weh)
100 years
Nominal Size
NG25
Pilot Volume (2-spool Switching)
28.4 cm³
Porting Pattern
ISO 4401-08-08-0-05
Surface Coating Thickness
Max 100 µm
Way Configuration
4-way
1620 Old Apex Road
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