Valve insert and valves designed therewith

摘要

A valve insert is designed for use in valve casings for making up air valves which may be controlled by air under pressure or by a mechanical system and which are normally open or closed. The valve insert is made up of a housing, which is open at its two ends and has two groups of outwardly running openings, which are separated from each other by an outer gasket ring. The valve further has a spool with sealing rings. One end the spool has a hook having a neck part which is spaced from the spool axis and a hook end which is normal to the neck part. The end part of the hook extends past the axis of the spool a distance which is at least equal to the distance of the neck part of the hook from the axis of the spool. The diameter of the hook end is somewhat smaller than the distance between the hook end and the end face of the spool. The sealing rings are so placed that, on operation of the valve and motion of the spool, one inner sealing ring is moved over one group of openings.