Bosch Rexroth | 4WEH22J7X6EW110N9DK25L
4WEH22J7X/6EW110N9DK25L
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The 4WEH22J7X/6EW110N9DK25L directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. It directs flow in hydraulic automation circuits that require fast, high-volume shifting. The NG 25 size enables installation in medium-frame manifolds, while the ISO 4401-08-08-0-05 porting pattern aligns with standardized subplates. A maximum flow capacity of 450 l/min under symbol J allows the valve to handle large actuator demands, and channels p, a, and b sustain operating pressures up to 280 bar to match high-pressure pump systems. Relief at port T is permitted to 250 bar so return lines can tolerate elevated back-pressure conditions. System cleanliness must stay within class 20/18/15 per ISO 4406 to prevent spool wear, and a mean time to dangerous failure of 100 years supports safety calculations in long-life machinery.
For pilot control, the unit accepts pressures up to 210 bar, while a spring-centered three-position shift requires at least 10.5 bar to move the spool. The pilot chamber holds 7.64 cm³, giving designers data for response-time estimates. Port Y withstands 160 bar so internal leakage can be routed safely to tank or an external drain. Mechanical fixation relies on six mounting screws; each M12 × 60 fastener must be tightened to 100 Nm to secure the valve body against hydraulic forces. These hardware figures simplify assembly on stack manifolds and ensure repeatable sealing performance.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Max Flow (symbol J)
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 (3-pos, Spring-centered)
10.5 bar
Mounting Screw Size
M12 x 60
Mounting Screw Torque
100 Nm
Mounting Screws (qty)
6 pcs
Mttfd
100 years
Pilot Volume (3-pos, Spring-centered)
7.64 cm3
Port Y Max Pressure (ac)
160 bar
Porting Pattern
ISO 4401-08-08-0-05
Size
NG 25
1620 Old Apex Road
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