Bosch Rexroth | 4WEH22G7X6EG12N9EDAB08
4WEH22G7X/6EG12N9EDA/B08
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The 4WEH22G7X/6EG12N9EDA/B08 directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth for hydraulic automation circuits. It regulates flow with a 4-way configuration that offers three spool positions, so actuators can extend, retract, or remain in a neutral state. The G spool symbol defines the internal cross-connections, and a spring-based spool return automatically centers the element when pilot pressure is removed. A 6E pilot valve shifts the main stage; pilot oil enters internally through port X and returns externally through port Y. This arrangement works once the supply reaches at least 4.5 bar and it tolerates up to 210 bar on the pilot side. With a nominal size of 25, the component fits cavities laid out to the ISO 4401-08-08-0-05 pattern, allowing direct mounting in standard manifolds.
Ports P, A, and B handle operating pressures up to 280 bar, while port T is rated for 250 bar to accommodate return flow without damage. A B08 throttle insert with a 0.8 mm orifice restricts pilot oil to promote stable shifting at high system pressures. The concealed N9 manual override permits local movement of the spool when electrical signals are absent, yet keeps the linkage protected from dirt. System oil must meet ISO 4406 cleanliness class 20/18/15 to avoid abrasion and sticking of close-tolerance parts. Together these limits and accessories ensure the valve sustains repeatable performance in demanding hydraulic automation loops.
Technical Specifications
Cleanliness Class
20/18/15 (ISO 4406)
Control Spool Return
By Springs
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (x Internal)
4.5 bar
Nominal Size (ng)
25
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (X)
Pilot Valve Type
6E
Porting Pattern
ISO 4401-08-08-0-05
Spool Positions
3
Spool Symbol
G
Throttle Insert
Ø 0.8 mm (B08)
Way Configuration
4-Way
1620 Old Apex Road
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