Bosch Rexroth | 4WEH22E7X6EW110N9DK25L
4WEH22E7X/6EW110N9DK25L
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The 4WEH22E7X/6EW110N9DK25L directional spool valve is manufactured by Bosch Rexroth for the WEH Directional Spool Valves series and is used to route pressurized oil to cylinders and motors in automated hydraulic systems. Its nominal size of NG25 sets the flow section for large-capacity circuits, while the 4-way layout supplies two work ports plus pressure and tank connections. A spool type E establishes the internal flow paths and allows a peak flow of 450 l/min. Ports p, a, and b accept operating pressures up to 280 bar, enabling high-pressure motion control. The main stage is spring-centered so the spool returns to neutral when pilot pressure is removed, and a minimum of 10.5 bar is needed to shift it. A concealed manual override permits local actuation during setup or maintenance without disturbing electrical pilot control.
The pilot stage tolerates pressures up to 210 bar, and the tank port is rated for 250 bar to prevent back-pressure damage. Mounting follows the ISO 4401-08-08-0-05 interface and uses six M12 × 60 ISO 4762 screws tightened to 100 Nm with a ±10 % margin. Compatible fluids must comply with DIN 51524, and system cleanliness must reach ISO 4406 20/18/15 to protect the precision-ground spool and bore. The calculated mean time to dangerous failure (Mttfd) is 100 years, supporting long service intervals in industrial equipment.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Hydraulic Fluid Standard
DIN 51524
Main Stage Centering
Spring-Centered
Manual Override
Concealed
Max Flow (spool E)
450 l/min
Max Operating Pressure (p,a,b)
280 bar
Max Pilot Pressure
210 bar
Max Tank Port Pressure (t)
250 bar
Min Pilot Pressure (spring-centered)
10.5 bar
Mounting Screws
6× M12×60 (ISO 4762)
Mttfd
100 years
Nominal Size
NG25
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm ±10%
Spool Type
E
Way Configuration
4-Way
1620 Old Apex Road
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