Bosch Rexroth | 4WEH22K7X6EG24N9ETK4B10
4WEH22K7X/6EG24N9ETK4/B10
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The 4WEH22K7X/6EG24N9ETK4/B10 directional spool valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series to control flow direction in hydraulic automation. It fits the NG25 nominal size so it matches circuits designed for that capacity, and it installs on subplates that follow the ISO 4401-08-08-0-05 porting pattern. Pilot oil is supplied and returned internally, eliminating external pilot lines. Working ports A and B can handle up to 280 bar, while the pilot stage tolerates 210 bar to shift the spool with authority; the two-spool spring design needs at least 11 bar to engage fully. Electrical actuation relies on 24 V DC coils that connect through a DIN EN 175301-803 K4 plug, enabling straightforward wiring. A concealed N9 manual override permits local spool movement when power is absent, and a 1.0 mm B10 throttle insert moderates pilot flow to damp pressure surges.
The valve functions in ambient temperatures up to 50 °C, and the hydraulic fluid may reach 80 °C without impairing performance. System oil must be kept at ISO 4406 20/18/15 cleanliness to avoid sticking and erosion of the metering edges. External surfaces are protected by a coating not exceeding 100 µm in thickness so mounting accuracy is retained, while sealing faces are finished to a maximum roughness of Rz 4 µm to maintain leak-free joints. A calculated MTTFd of 100 years under EN ISO 13849 supports high safety performance levels in machine designs. These measures combine to deliver reliable, long-life operation in automated hydraulic systems.
Technical Specifications
Ambient Temperature Max
50 °C
Cleanliness Class
ISO 4406 (c) 20/18/15
Coating Layer Thickness Max
100 µm
Contact Surface Roughness
Rzmax 4 µm
Electrical Connection
DIN EN 175301-803 (K4)
Electrical Supply Voltage
24 V DC
Hydraulic Fluid Temp Max
80 °C
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (2-spool Spring End)
11 bar
Mttfd According To En Iso 13849
100 years
Nominal Size
NG25
Pilot Oil Supply/return
Internal/Internal
Porting Pattern
ISO 4401-08-08-0-05
Throttle Insert
Ø 1.0 mm (B10)
1620 Old Apex Road
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