Electrically operated valves

Claim 1

A BALL-TYPE ELECTRICALLY OPERATED VALVE COMPRISING A SHELL-TYPE ELECTROMAGNET WITH A FIXED CORE FORMING A FLUID INLET PASSAGE INTO THE ELECTRICALLY OPERATED VALVE AND A COVER EMBODYING A FLUID OUTLET PASSAGE, A BALL-VALVE MADE OF MAGNETIC MATERIAL AND A SEAT BEING INTERPOSED BETWEEN SAID COVER AND SAID CORE, AND THE ASSEMB LY CONSISTING OF SAID CORE, COVER AND SEAT BEING SO DEVISED THAT WHEN THE ELECTRICALLY OPERATED VALVE IS ENERGIZED SAID BALLVALVE CLOSES THE MAGNETIC FIELD BETWEEN SAID COVER AND SAID CORE IN A POSITION OF ATTRACTION AGAINST SAID SEAT THAT LEAVES A CERTAIN AIR GAP BETWEEN SAID BALL VALVE AND SAID CORE, CHARACTERIZED IN THAT SAID SEAT IS FORMED INTERNALLY OF SAID CORE AT THE END OF SAID INLET PASSAGE AND IN THAT A HOUSING FOR SAID BALL-VALVE PROVIDES GUIDANCE THEREFOR ALONG THE SEAT AXIS AND COMPRISES PASSAGES FOR FLOWING THE FLUID ABOUT SAID BALL-VALVE, SAID PASSAGES BEING SHAPED TO CAUSE ROTATION OF THE BALL IN RESPONSE TO FLOW.