Bosch Rexroth | 4WEH22E7X6EW110NTDAB08
4WEH22E7X/6EW110NTDA/B08
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The 4WEH22E7X/6EW110NTDA/B08 directional spool valve is produced by Bosch Rexroth within the WEH Directional Spool Valves series. Intended for hydraulic automation, it uses electro-hydraulic actuation to shift the spool and redirect flow between pressure and work ports. Size 25 dimensions correspond to the ISO 4401-08-08-0-05 mounting pattern, facilitating direct manifold installation. The pilot stage is arranged on actuating side a, and it receives pressurized oil through external port X while returning it internally to tank via port T, reducing external piping. A throttle insert with a 0.8 mm diameter is fitted in the pilot supply line to smooth response during rapid command changes. Spool code E defines the internal cross-connections that the main spool provides in each operating state, and the valve must run with hydraulic fluids that meet DIN 51524 to maintain compatibility with seals and sliding surfaces.
In the spring-centered e position, the valve handles flow rates up to 450 l/min, making it suitable for high-capacity circuits. Ports P, A, and B can be pressurized to 280 bar during continuous service, while the pilot section tolerates up to 210 bar but only requires 10.5 bar to overcome the return spring and shift the spool. A built-in pressure-reducing valve limits secondary pilot pressure to 45 bar to protect the solenoid-operated stage from overload. Six M12 × 60 mounting screws are specified for fastening, and each screw is tightened to 100 Nm to prevent plate separation under peak load.
Technical Specifications
Actuating Side
a
Hydraulic Fluid Standard
DIN 51524
Max Flow (e, Spring-centered)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mounting Pattern
ISO 4401-08-08-0-05
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Pressure Reducing Valve Secondary Pressure
45 bar
Screw Tightening Torque
100 Nm
Size (ng)
25
Spool Symbol
E
Throttle Insert Diameter
0.8 mm
Type Of Actuation
Electro-Hydraulic
Valve Mounting Screws
M12 x 60 (6 pcs)
1620 Old Apex Road
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