Bosch Rexroth | 4WEH22R7X6EW110N9ETK4B10V
4WEH22R7X/6EW110N9ETK4/B10V
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The 4WEH22R7X/6EW110N9ETK4/B10V valve is produced by Bosch Rexroth in the WEH Directional Spool Valves series. Designed for hydraulic automation, it directs flow between actuator ports under electrical pilot control. Its nominal size is NG25, which aligns with installations following the ISO 4401-08-08-0-05 porting pattern. The valve supports a maximum flow of 450 l/min to accommodate large volume circuits, and it is rated for a maximum operating pressure of 280 bar so cylinder and motor loads can be switched without cavitation. Pilot oil is supplied internally from port P, and the return path is also internal to port T, eliminating external pilot lines. Solenoid power reaches the unit through a DIN EN 175301-803 connector coded K4, enabling quick plug-in wiring. A concealed manual override identified as N9 permits local actuation when electrical power is unavailable. A throttle insert with a 1.0 mm orifice labeled B10 can be fitted to limit pilot flow and stabilize shifting speed.
In pilot operation the valve accepts pressures down to 10.5 bar and up to 210 bar, defining the permissible pilot range. Cleanliness of the hydraulic medium must not exceed ISO 4406 class 20/18/15 to maintain spool reliability. Mounting uses four M12 × 60 screws compliant with ISO 4762, each tightened to 100 Nm to secure the body on the manifold. With two solenoids installed the assembly weighs 11.9 kg, a value that assists in determining support bracket capacity. The calculated mean time to dangerous failure (Mttfd) is 100 years, which supports long-term safety assessments. The screw length of 60 mm provides sufficient thread engagement in the subplate while leaving space for lock washers. Once installed, the 11.9 kg mass results in low vibration during high-frequency switching. Horizontal or vertical mounting is permissible because the internal drainage eliminates position-dependent leakage.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow
450 l/min
Max Operating Pressure
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure
10.5 bar
Mounting Screws
M12 x 60 (ISO 4762)
Mttfd
100 years
Nominal Size
NG25
Pilot Oil Return
Internal (T)
Pilot Oil Supply
Internal (P)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
Throttle Insert
Ø 1.0 mm (B10)
Weight (2 Solenoids)
11.9 kg
1620 Old Apex Road
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