Bosch Rexroth | 4WEH22H7X6EW110N9EK4B10P4-5
4WEH22H7X/6EW110N9EK4/B10P4 5
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The 4WEH22H7X/6EW110N9EK4/B10P4 5 directional valve is manufactured by Bosch Rexroth and belongs to the WEH Directional Spool Valves series. It shifts flow paths in hydraulic automation circuits where remote electrical control is required. The valve is built to nominal size 25 so passage sections match medium-to-high flow applications. A mounting interface conforming to ISO 4401-08-08-0-05 lets the body seat directly on standard subplates, and six M12 × 60 screws according to ISO 4762 fasten it in place. These screws must be tightened to 100 Nm within a 10 percent margin to maintain seal compression. Pilot oil is taken internally, identified by the code E, so no external pilot line is needed. A 1.0 mm throttle insert marked B10 restricts pilot flow to damp spool movement. Electrical actuation is connected through a DIN EN 175301-803 K4 plug that simplifies coil replacement, while a concealed manual override labeled N9 allows local shifting when power is absent without exposing the push pin to accidental operation.
For performance limits, the valve carries a maximum operating pressure of 280 bar on ports P, A, and B, supporting high-pressure circuits. The pilot stage tolerates up to 210 bar yet requires at least 8 bar to reach the hydraulic end positions, so control accuracy is retained across a wide range. A preload valve that cracks at 4.5 bar, given by the P4,5 code, keeps the pilot gallery primed before spool travel begins. Acceptable oil viscosity spans 2.8 to 500 mm²/s, enabling use with light or heavy mineral fluids. Hydraulic fluid may run between −20 and +80 °C, and the valve can be installed where ambient air stays from −20 to +50 °C, so cold-start and warm-service conditions are both covered. System cleanliness must be ISO 4406 class 20/18/15 or better to avoid spool sticking and seat erosion. Together these limits define the operating window for reliable directional control in automated hydraulic machinery.
Technical Specifications
Ambient Temperature Range (nbr)
−20 to +50 °C
Electrical Connection
DIN EN 175301-803 (K4)
Fluid Cleanliness
ISO 4406 (c) 20/18/15
Hydraulic Fluid Temp Range (nbr)
−20 to +80 °C
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (hydraulic End Pos.)
8 bar
Mounting Pattern
ISO 4401-08-08-0-05
Mounting Screws
6 × M12 × 60 (ISO 4762)
Nominal Size (ng)
25
Pilot Oil Supply
Internal (E)
Preload Valve Cracking Pressure
4.5 bar (P4,5)
Screw Tightening Torque
100 Nm ±10%
Throttle Insert
Ø1.0 mm (B10)
Viscosity Range
2.8 to 500 mm²/s
1620 Old Apex Road
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