Bosch Rexroth | H-4WEH22J7X6EW110N9DA
H-4WEH22J7X/6EW110N9DA
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The H-4WEH22J7X/6EW110N9DA valve is part of the WEH Directional Spool Valves series from Bosch Rexroth and is used to shift hydraulic flow paths in automated systems. Its nominal size of 25 establishes passage dimensions compatible with high-capacity circuits, while the ISO 4401-08-08-0-05 porting pattern matches common manifold layouts to simplify block design. A maximum operating pressure of 350 bar on ports P, A, and B allows the unit to handle high-pressure supply lines, and a performance limit of 520 l/min at that pressure supports large actuators without excessive loss. The tank port can accept up to 250 bar, protecting return plumbing in counterbalance or regenerative circuits. A pilot volume of 7.64 cm³ in the spring-centered spool influences shift timing during directional changes, and the required fluid cleanliness class of ISO 4406 20/18/15 prevents contamination-related wear that could impede spool movement.
The pilot stage tolerates up to 210 bar, so upstream control pressure can be tapped directly from standard system lines, yet a minimum of 12.5 bar is needed to move the three-position spring-centered spool reliably. When an external Y line is used, the pilot return may reach 160 bar, allowing the valve to operate in back-pressure environments. Mechanical fastening is achieved with six M12 × 60 screws that follow ISO 4762, and each screw must be tightened to 100 Nm to maintain a leak-free seal on the manifold face. Functional safety is reflected in an assessed mean time to dangerous failure of 100 years, supporting long service intervals in continuous-duty machines.
Technical Specifications
Fluid Cleanliness Class
ISO 4406 20/18/15
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
210 bar
Max Tank Port Pressure (t)
250 bar
Min Pilot Pressure (3-pos, Spring-centered)
12.5 bar
Mounting Screws
6x M12 x 60 (ISO 4762)
Mttfd (type Weh)
100 years
Nominal Size (ng)
25
Performance Limit (j, 350 Bar)
520 l/min
Pilot Return Y External (ac) Max Pressure
160 bar
Pilot Volume (spring-centered)
7.64 cm3
Porting Pattern
ISO 4401-08-08-0-05
Screw Tightening Torque
100 Nm
1620 Old Apex Road
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