Bosch Rexroth | H-4WEH22C7X6EG24N9ETK4B10D3
H-4WEH22C7X/6EG24N9ETK4/B10D3
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The H-4WEH22C7X/6EG24N9ETK4/B10D3 valve is manufactured by Bosch Rexroth in the WEH Directional Spool Valves series and directs hydraulic flow in automation circuits. It is built in size NG25 (W.H 22) and moves a two-position spool through electro-hydraulic actuation. A 24 V DC coil energizes the pilot stage, and wiring is completed through a DIN EN 175301-803 connector coded K4. A concealed manual override designated N9 allows local operation when power is unavailable. The throttle insert has a 1.0 mm diameter to meter pilot flow, and internal ET lines provide both pilot oil supply and return without external hoses. Flow paths follow spool symbol C to establish the required connections between ports.
The main flow ports withstand up to 350 bar, while pilot inlets are rated for 210 bar. Shortest switching times are reached when the pilot stage receives 35 l/min, and each actuation moves 15.28 cm³ of pilot oil. Reliable operation of the hydraulic end begins at a minimum pilot pressure of 8 bar. An integrated pressure reducing valve identified as D3 limits pilot pressure to protect internal components. These limits on pressure, pilot flow, and volume define the performance envelope needed for consistent directional changes in automated power units.
Technical Specifications
Actuation Type
Electro-Hydraulic (WEH)
Coil Voltage
24 V DC
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure (2-sp Hydraulic End)
8 bar
Pilot Flow For Shortest Switching Time
35 l/min
Pilot Oil Return
Internal (ET)
Pilot Oil Supply
Internal (ET)
Pilot Volume Per Switching (2-sp)
15.28 cm3
Pressure Reducing Valve
D3
Size
NG25 (W.H 22)
Spool Positions
2
Spool Symbol
C
Throttle Insert Diameter
1.0 mm
1620 Old Apex Road
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