Bosch Rexroth | 4WEH22D7X6EW110N9TK4
4WEH22D7X/6EW110N9TK4
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The 4WEH22D7X/6EW110N9TK4 directional spool valve belongs to the WEH Directional Spool Valves series produced by Bosch Rexroth for hydraulic automation tasks that require positive flow switching. It is supplied in nominal size NG25, referenced by the company as W.H 22. A 4-way layout permits simultaneous connection of pressure, return, and two working lines. The internal spool carries symbol D, defining the crossover flow paths used during shifting. Two distinct positions allow alternate energizing of service ports without intermediate stops. Manifold mounting follows ISO 4401-08-08-0-05, ensuring compatibility with standard subplates. Pilot oil is sourced through internal channel X, so no external pressure tap is necessary. The pressure ports P, A, and B may be loaded to 280 bar during continuous operation.
The tank port T withstands up to 250 bar, enabling operation with elevated back-pressure. Return port Y on the pilot side is limited to 160 bar when connected externally. The pilot stage accepts pressures up to 210 bar for reliable actuation. A spring-centered two-position spool needs at least 11 bar pilot pressure to shift. Hydraulic fluid cleanliness must meet ISO 4406 class 20/18/15 to protect sliding surfaces. External coatings are restricted to 100 µm thickness to avoid blocking mounting threads and seal grooves. The mean time to dangerous failure for this WEH design is 100 years, supporting long-term service in safety functions. A valve fitted with one solenoid weighs 11.5 kg, which must be considered when planning manifold support.
Technical Specifications
Cleanliness Class
ISO 4406 20/18/15
Max Coating Thickness
100 µm
Max Pressure (p, A, B)
280 bar
Max Pressure Port T
250 bar
Max Pressure Port Y (external, Ac)
160 bar
Maximum Pilot Pressure
210 bar
Minimum Pilot Pressure (2-spool Spring)
11 bar
Mttfd (type Weh)
100 years
Nominal Size
NG25 (W.H 22)
Pilot Oil Return
External (Y)
Pilot Oil Supply
Internal (X)
Porting Pattern
ISO 4401-08-08-0-05
Spool Positions
2
Spool Symbol
D
Way Version
4-Way
Weight (one Solenoid)
11.5 kg
1620 Old Apex Road
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