Bosch Rexroth | 4WEH22R7X6EG24N9TK4
4WEH22R7X/6EG24N9TK4
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The 4WEH22R7X/6EG24N9TK4 directional spool valve belongs to the WEH Directional Spool Valves series and is produced by Bosch Rexroth. It directs hydraulic flow in automated systems by shifting a NG25 spool, matching the nominal size requirement for circuits handling medium to high volume. The valve conforms to the ISO 4401-08-08-0-05 porting pattern so it mates with standardized subplates without extra adapters. Flow can reach 450 l/min, and the pressure limit on ports P, A, and B is 280 bar, allowing the component to control large actuators without exceeding structural limits. Control energy comes from a 24 V DC solenoid, and the pilot lines draw supply from port X externally while returning oil internally to port T to simplify piping. Despite the flow rating, the assembly weighs 11.9 kg, which supports straightforward manifold mounting.
Pilot operation defines dynamic behavior; the spring-centered design needs at least 10.5 bar to shift the spool, with a pilot volume of 7.64 cm³ influencing response time. Upstream pressure on the pilot circuit can be as high as 210 bar, and the same 210 bar limit applies to the internal pilot return path, preventing overload when backpressure rises. Acceptable fluid viscosity spans 2.8 to 500 mm²/s so the valve remains functional from light oils to heavier blends, while an NBR seal set tolerates temperatures from −20 to +80 °C. System cleanliness must meet ISO 4406 class 20/18/15 to protect the fine metering edges and maintain reliability. Together these limits define the allowable operating window for automated hydraulic machines that depend on consistent directional control.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid Temp Range
-20 to +80 °C (NBR)
Max Flow
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pilot Return Pressure (internal, Dc)
210 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Nominal Size
NG25
Pilot Return
Internal (T)
Pilot Supply
X External
Pilot Volume (spring-centered)
7.64 cm³
Porting Pattern
ISO 4401-08-08-0-05
Solenoid Voltage
24 V DC
Viscosity Range
2.8 to 500 mm²/s
Weight (two Solenoids, Spring-centered)
11.9 kg
1620 Old Apex Road
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