Bosch Rexroth | 4WEH22E7X6EW110N9ETK4B08
4WEH22E7X/6EW110N9ETK4/B08
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The 4WEH22E7X/6EW110N9ETK4/B08 valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. The unit directs pressure and return lines in hydraulic automation circuits and is configured for manifold installation. Its nominal size is NG25, and the interface follows the ISO 4401-08-08-0-05 porting pattern, allowing direct interchange with standard subplates. Pilot supply is taken internally through port X, while pilot return is routed internally to port T; this internal circulation requires a minimum pilot pressure of 10.5 bar to shift the spring-centered spool. The pilot stage tolerates up to 210 bar, and the internal return path withstands 160 bar. Main flow paths P, A, and B operate at a maximum of 280 bar, and port T is limited to 250 bar. Reliable performance is maintained when the ambient temperature does not exceed 50 °C.
The valve accommodates up to 450 l/min when an E-spool is used in the three-position configuration, supporting large actuators without excessive pressure drop. A throttle insert with a 0.8 mm orifice can be fitted to moderate pilot oil flow and improve stability in sensitive circuits. Hydraulic fluid temperature may reach 80 °C, and oil cleanliness must conform to ISO 4406 class 20/18/15 to protect the precision-ground spool and bore. Mechanical attachment to the subplate is handled by six M12 × 60 screws compliant with ISO 4762; each fastener is tightened to 100 Nm to secure the housing against load-induced vibration. These mounting details, coupled with the specified flow, temperature, and contamination limits, define the operating envelope for consistent service in industrial hydraulic systems.
Technical Specifications
Ambient Temp Max (standard)
+50 °C
Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid Temp Max (nbr)
+80 °C
Max Flow (e Spool, 3-pos)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pilot Return (y) Internal (ac)
160 bar
Max Pressure (port T)
250 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Nominal Size
NG25
Pilot Return
Internal (T)
Pilot Supply
Internal (X)
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
Throttle Insert Orifice
0.8 mm
1620 Old Apex Road
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