Bosch Rexroth | 4WEH22D7XOF6EW110N9TDALP45
4WEH22D7X/OF6EW110N9TDAL/P4.5
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The 4WEH22D7X/OF6EW110N9TDAL/P4.5 valve belongs to the WEH Directional Spool Valves series and is manufactured by Bosch Rexroth. It directs flow in hydraulic automation circuits by shifting an NG25 size spool between two commanded positions. Electro-hydraulic actuation allows remote electrical signals to pilot the spool, while a spring return in the main stage re-centers the element when power is removed. The valve mounts to manifolds with the ISO 4401-08-08-0-05 porting pattern. A maximum operating pressure of 280 bar supports high-pressure systems, and the flow path can pass up to 320 l/min at 350 bar. External pilot oil supply through port X energizes the pilot stage, and internal return to tank through port T routes the pilot fluid back without extra lines.
For pilot control the unit accepts pressures between 11 bar and 210 bar; 11 bar is the minimum pilot pressure required to shift the spool, and 210 bar is the allowable pilot pressure limit. Each switching event consumes 15.28 cm³ of pilot oil, informing accumulator and pump sizing. The integrated preload valve opens at 4.5 bar to establish sufficient back-pressure before the main stage moves. Component surfaces receive a corrosion-resistant coating up to 100 µm thick, and internal passages are manufactured to meet ISO 4406 class 20/18/15 cleanliness. Mechanical durability is reflected by an MTTFd of 100 years, a value used in functional safety assessments.
Technical Specifications
Actuation
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Coating Thickness Max
100 µm
Main Valve Return
Spring
Max Operating Pressure
280 bar
Max Pilot Pressure
210 bar
Min Pilot Pressure
11 bar
Mttfd
100 years
Pilot Oil Return
Internal (T)
Pilot Oil Supply
External (X)
Pilot Volume Per Switch
15.28 cm3
Porting Pattern
ISO 4401-08-08-0-05
Preload Valve Cracking Pressure
4.5 bar
Qv Max (d, 350 Bar)
320 l/min
Size
NG25
Spool Positions
2
1620 Old Apex Road
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