Double acting electromagnetic valve

Claim 1

A double acting electromagnetic valve comprising a hollow main body having internally a space acting as a valve chamber, a pair of magnetic cores each having a concentric polar arrangement and an E-shaped axial cross section, secured respectively to two lateral surfaces of said main body such that the end of the central leg of each magnetic core and at least one part of the annular end surface of the outer leg of each said core are disposed directly within said valve chamber, a movable magnetic member positioned in said valve chamber so as to be shiftable axially therein between said pair of cores to bring the magnetic member into tight contact with said end of the central leg and said one part of the annular end surface of the outer leg of either one of said magnetic cores when the member is moved to an extremity of said chamber, two coils each encased in a coil-receiving recess formed between the central leg and the outer leg of the magnetic cores, respectively, said coils being adapted to be energized to magnetize the respective magnetic core to bring said magnetic member into said tight contact positions, respectively, said magnetic cores being made of high carbon steel constituting a magnetic material which is not a permanent magnet but has sufficient residual magnetism to retain said movable member in its respective tight contact position following deenergization of said respective coils, a fluid passage formed through the central leg of each one of the magnetic cores and in said main body, a valve seat formed at the end of each core fluid passage exposed to said valve chamber, valve members provided on said shiftable magnetic member to abut against the valve seats, and said valve members being united into a single valve member made of a rubberlike material and exposed to both sides of said magnetic member.