Bosch Rexroth | 4WEH22G7X6EW110N9DK25L
4WEH22G7X/6EW110N9DK25L
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The 4WEH22G7X/6EW110N9DK25L directional valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series. It employs electro-hydraulic actuation so a pilot stage shifts the spool when energized, providing remote control in hydraulic automation. The nominal size is NG25, establishing interface dimensions for 25 mm flow paths, and the 4/3-way port configuration supplies four service ports with three selectable positions. Spool symbol G defines the specific flow pattern, while a spring return centers the spool once pilot pressure is removed. The spring-centered design needs a minimum pilot pressure of 10.5 bar to reach each working position. A maximum flow rate of 400 l/min at 70 bar supports high-capacity circuits, and the main ports can withstand operating pressures up to 280 bar.
The pilot stage tolerates pressures up to 210 bar, and the pilot return line is limited to 160 bar for safe discharge to tank. Acceptable fluid temperature ranges from −20 °C to +80 °C, allowing operation in cold starts and warm service. System cleanliness must meet ISO 4406 class 20/18/15 to prevent wear between the spool and sleeve. A concealed manual override enables local shifting during setup or power loss without exposing moving parts. The mounting interface follows porting pattern ISO 4401-08-08-0-05 for compatibility with standard subplates. The valve’s predicted mean time to dangerous failure is 100 years.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Fluid Temp Max (nbr)
+80 C
Fluid Temp Min (nbr)
−20 C
Manual Override
Concealed
Max Flow (symbol G, 70 Bar)
400 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pilot Return Pressure (ac)
160 bar
Min Pilot Pressure (3-pos, Spring)
10.5 bar
Mttfd (weh)
100 years
Nominal Size
NG25
Port Configuration
4/3-Way
Porting Pattern
ISO 4401-08-08-0-05
Spool Return Type
Spring
Spool Symbol
G
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