Bosch Rexroth | 4WEH22D7X6EW110N9K4
4WEH22D7X/6EW110N9K4
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The 4WEH22D7X/6EW110N9K4 directional spool valve is manufactured by Bosch Rexroth as part of the WEH Directional Spool Valves series and is installed to shift flow paths in automated hydraulic units. It uses a nominal size of 25 to match manifold cavities built for medium-flow equipment. Two spool positions permit switching between supply and exhaust states without intermediate stops. An external pilot oil supply lets the device operate independently of main line pressure so control signals stay stable. The pilot return port Y tolerates up to 160 bar, enabling remote return routing when back-pressure is present. A concealed manual override marked N9 allows local actuation during commissioning while protecting against accidental use. Electrical actuation is achieved through a DIN EN 175301-803 form K4 connector that supports common industrial wiring. System cleanliness must not exceed ISO 4406 code 20/18/15 so the precision spool clearances remain reliable. Functional lifetime is indicated by an MTTFd of 100 years, giving designers a wide safety margin. Installation relies on six M12×60 ISO 4762 screws, each tightened to 100 Nm, to secure the valve to sub-plates following the ISO 4401-08-08-0-05 pattern.
During operation the valve carries a maximum working pressure of 280 bar at ports P, A, and B, supporting high-pressure actuators. When built with spool symbol D and supplied at 210 bar, it can pass up to 450 l/min, covering high-flow circuits such as press drives. Pilot control stages withstand up to 210 bar so the remote operator can match main pressure without damage. The two-stage design still needs at least 11 bar pilot pressure to overcome return springs and shift the main spool. Port T is rated for 250 bar to allow intensive counterbalance or back-pressure functions on the tank line. These limits let the 4WEH22D7X/6EW110N9K4 support fast cylinder cycles while keeping internal stresses within design ratings.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Electrical Connection
DIN EN 175301-803 (K4)
Manual Override
Concealed (N9)
Max Flow (symbol D, 210 Bar)
450 l/min
Max Operating Pressure (p, A, B)
280 bar
Max Pilot Pressure
210 bar
Max Pressure Port T
250 bar
Min Pilot Pressure (2-spool Spring)
11 bar
Mounting Screws
6× M12 × 60 (ISO 4762)
Mttfd (type Weh)
100 years
Nominal Size (ng)
25
Pilot Oil Supply
External
Pilot Return Y Max Pressure (ac)
160 bar
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
Spool Positions
2
1620 Old Apex Road
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