4WEH22H7X/6EW110N9DAL

The 4WEH22H7X/6EW110N9DAL directional spool valve is manufactured by Bosch Rexroth within the WEH Directional Spool Valves series for switching hydraulic flow paths in automated circuits. It is supplied in nominal size NG25 (W.H 22), a channel cross-section that supports high flow rates typical of central power units. Manifold mounting is standardized through the ISO 4401-08-08-0-05 pattern, allowing direct installation on subplates without additional adapters. The body is fixed with six M12×60 screws specified by ISO 4762, a fastening arrangement that keeps the valve sealed against system pressure. To protect sliding components, the permissible oil cleanliness is rated at ISO 4406 class 20/18/15(c), so filtration must hold particle contamination below that level. Working ports P, A, and B withstand up to 350 bar, so the valve can be placed in high-pressure supply lines without risk of housing distortion.

Pilot operation is allowed up to 210 bar, giving consistent spool actuation when the control pressure exceeds typical pump standby levels. For the two-position version with a spring return, the pilot circuit must maintain at least 11 bar so the spool shifts fully during energization. Return flow through port T is limited to 250 bar, ensuring the tank connection stays within seal limits when back-pressure builds. An external drain via port Y may be connected, but its line pressure must not exceed 160 bar to avoid pushing against the internal pilot network. These pressure capabilities combine to let the valve manage direction changes reliably in demanding hydraulic automation.