Pulsed magnetic valve assembly

Claim 1

A pulsed magnetic valve assembly having permanent magnet support means with constant remanence comprising: valve means adapted to be electromagnetically operated and comprising a closure member; electromagnetically means for operating said valve means, said electromagnetic means including a movable core member associated with said closure member and a ferromagnetic circuit; permanent magnet means produced from a rare earth/cobalt alloy forming part of said ferromagnetic circuit; a tubular core guide member for guiding said movable core member; and a stopper member for limiting movement of said movable core member in one direction; said ferromagnetic circuit including sheet metal sheets forming an outer part of said ferromagnetic circuit with said movable core member forming an inner part of said ferromagnetic circuit; trip and drop coil means surrounding said guide member and generally enclosed by said sheet metal sheets; said sheet metal sheets having portions extending radially towards said movable core member, said radially extending portions being shaped to define cutouts located in a generally annular configuration around one end of said tubular core guide member, with said permanent magnet means being inserted into siad cutouts in contact with said radially extending portions in a manner to extend around said one end of said tubular core guide member in a generally annular configuration whereby the core member can be secured in a switched position by said permanent magnet means.