Bosch Rexroth | 4WEH22E7X6EW110N9EDAB08
4WEH22E7X/6EW110N9EDA/B08
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The 4WEH22E7X/6EW110N9EDA/B08 directional valve is part of the WEH Directional Spool Valves series from Bosch Rexroth. Designed for hydraulic automation, it routes pressure and return flow to actuators by shifting a spool. The nominal size NG25 determines the flow section and matches standard subplates. A porting pattern of ISO 4401-08-08-0-05 aligns its mounting faces with common manifold layouts. An E-coded spool provides the flow paths demanded by typical cylinder circuits, and three discrete spool positions permit extend, neutral, and retract functions. A spring-centered mechanism automatically returns the spool to the neutral position when pilot pressure is removed. Pilot control is handled by a 6E valve mounted on the cover, with internal pilot oil supply (X) drawing fluid from the pressure gallery. Pilot oil is discharged through an external Y port so back pressure in the tank line does not affect actuation. A concealed manual override identified by code N9 allows local shifting during commissioning or power loss.
During operation the valve handles up to 450 l/min when the E spool is selected, allowing high-volume circuits to cycle quickly. Pressure capability reaches 280 bar at ports P, A, and B, while the T port is limited to 250 bar to protect return plumbing. The pilot stage tolerates a maximum of 210 bar and requires at least 10.5 bar to shift the main spool, ensuring reliable movement under low system pressure. A throttle insert with a 0.8 mm orifice (B08) is fitted in the pilot channel to stabilize response times and damp pressure spikes. Oil cleanliness must be maintained to ISO 4406 class 20/18/15 to prevent wear in the precision-ground spool and bore. These parameters define the operating envelope for installing the 4WEH22E7X/6EW110N9EDA/B08 valve in automated hydraulic machinery.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Flow (symbol E)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (3-spool)
10.5 bar
Nominal Size
NG25
Pilot Control Valve Type
6E
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (X)
Porting Pattern
ISO 4401-08-08-0-05
Spool Centering
Spring-Centered
Spool Positions
3
Spool Symbol
E
Throttle Insert
Ø 0.8 mm (B08)
1620 Old Apex Road
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