Bosch Rexroth | 4WEH22M7X6EW110N9S2DK25L
4WEH22M7X/6EW110N9S2DK25L
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The 4WEH22M7X/6EW110N9S2DK25L directional spool valve is built by Bosch Rexroth within the WEH Directional Spool Valves series. Designed for hydraulic automation circuits, it uses electro-hydraulic actuation to shift a 4/3-way spool so that flow paths are switched remotely. The valve handles a nominal size of NG25, allowing a maximum flow of 450 l/min through symbol M passages. Working ports p, a, and b withstand operating pressures up to 280 bar, which suits medium-pressure manifolds. A pilot control valve type 4WE 6E drives the main stage, and its pilot spool follows symbol D for balanced metering of pilot oil. The subplate connection conforms to ISO 4401-08-08-0-05 so the unit drops onto standard NG25 manifolds without block modifications.
Pilot supply demands are defined by a maximum pilot pressure of 210 bar and a minimum external pilot pressure of 10.5 bar, ensuring reliable spool movement at both ends of the stroke. Switching time can be tuned through setting S2, which lets installers match response to system dynamics. A concealed manual override version N9 is fitted so that emergency actuation can occur without risking accidental operation. Mechanical fastening relies on four M12 × 60 screws, each tightened to 100 Nm to secure the body against the subplate. The valve’s actuation sequence benefits from these mounting standards, while the electro-hydraulic stage remains stable under the specified pressures.
Technical Specifications
Actuation Type
Electro-Hydraulic
Manual Override
Concealed (N9)
Max Flow (symbol M)
450 l/min
Max Operating Pressure (p/a/b)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (x External)
10.5 bar
Mounting Interface
ISO 4401-08-08-0-05
Mounting Screw Size
M12 x 60
Mounting Screw Torque
100 Nm
Nominal Size
NG25
Pilot Control Valve
4WE 6E
Pilot Spool Symbol
D
Spool Configuration
4/3-Way
Switching Time Adjustment
S2
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