Bosch Rexroth | 4WEH22D7X6EW110N9ETK4B08
4WEH22D7X/6EW110N9ETK4/B08
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The 4WEH22D7X/6EW110N9ETK4/B08 directional spool valve is part of the WEH Directional Spool Valves series from Bosch Rexroth and directs hydraulic flow in automated machinery. The valve uses electro-hydraulic actuation to shift a 4/2 D-coded spool for switching between two flow paths. Its nominal size is NG25, enabling suitable flow capacity for mid-range circuits. Installation follows a subplate method on the ISO 4401-08-08-0-05 mounting interface, and attachment is secured with six M12 × 60 screws that comply with ISO 4762. A 0.8 mm throttle insert is integrated to restrict pilot oil for stable switching. Pilot supply is internal, designated ET, while pilot return routes internally to port T to simplify external piping. A concealed N9 manual override allows local actuation when electrical power is absent.
The valve tolerates line pressures to 280 bar on ports P, A, and B, while the pilot stage operates safely up to 210 bar. When the spring-centered two-position version is used, spool movement begins once a pilot pressure of at least 11 bar is available. Electrical connection is made through a DIN EN 175301-803 K4 plug, giving standardized wiring in control cabinets. System cleanliness must be maintained to ISO 4406 class 20/18/15 to protect the precision spool lands. In service it weighs 11.5 kg, which supports straightforward handling during maintenance. These limits and interface details define the operating window and help integrators match the valve to pumps, accumulators, and directional logic in hydraulic automation systems.
Technical Specifications
Actuation
Electro-Hydraulic
Electrical Connection
DIN EN 175301-803 (K4)
Fluid Cleanliness
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (2-pos Spring)
11 bar
Mounting Pattern
ISO 4401-08-08-0-05
Mounting Type
Subplate
Nominal Size
NG25
Pilot Oil Return
Internal To T
Pilot Oil Supply
Internal (ET)
Spool Function
4/2 (D)
Throttle Insert
0.8 mm (B08)
Valve Mounting Screws
6 x M12 x 60 (ISO 4762)
Weight (approx)
11.5 kg
1620 Old Apex Road
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