Bosch Rexroth | 4WEH10HD4XOF6EW110N9ETSK4
4WEH10HD4X/OF6EW110N9ETSK4
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The 4WEH10HD4X/OF6EW110N9ETSK4 is a directional spool valve manufactured by Bosch Rexroth for the WEH Directional Spool Valves series. It directs actuator flow in hydraulic machinery and fits NG10 cavities for medium-size circuits. A mounting interface that follows ISO 4401-05-05-0-05 simplifies block installation and ensures interchangeability with other NG10 components. The D-coded spool establishes the required flow paths when the valve shifts, while a maximum operating pressure of 350 bar permits use in high-pressure systems. The unit passes up to 160 l/min without exceeding rated pressure loss, supporting fast cylinder or motor movement. Pilot oil is supplied internally (ET), so no external pilot line is needed, and reliable actuation begins at 7 bar with an upper pilot limit of 250 bar. These pressure limits safeguard the pilot stage from overload and guarantee full spool travel under varying supply conditions.
Pilot oil also returns internally, and the circuit may oppose up to 160 bar on port Y without hampering spool recovery. Switching speed can be trimmed through a supply-side control screw (S), giving the designer authority over acceleration shocks. Electrical actuation uses a DIN EN 175301-803 form K4 connector that streamlines coil replacement and sealing. A concealed manual override identified by code N9 enables emergency shifting without disturbing the solenoid wiring. The valve should be mounted horizontally to retain consistent pilot drainage and avoid air pockets. ISO 4406 cleanliness level 20/18/15 must be maintained to prevent spool sticking and seal wear; nitrile (NBR) seals are fitted to resist common mineral oils. Overall, these features combine to provide a compact valve that delivers dependable directional control where space, pressure capability, and precise switching adjustment are required.
Technical Specifications
Cleanliness Class
ISO 4406 (20/18/15)
Electrical Connection
DIN EN 175301-803 (K4)
Installation Position
Horizontal
Manual Override
Concealed (N9)
Max Flow
160 l/min
Max Operating Pressure
350 bar
Max Pilot Pressure
250 bar
Max Pilot Return Pressure (y Int, Ac)
160 bar
Min Pilot Pressure
7 bar
Mounting Interface
ISO 4401-05-05-0-05
Pilot Oil Return
Internal (ET)
Pilot Oil Supply
Internal (ET)
Seal Material
NBR
Size
NG10
Spool Symbol
D
Switching Time Adjustment
Supply Control (S)
1620 Old Apex Road
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