Automatic shut-off valve

Claim 1

IN COMBINATION WITH A TANK FOR FLUIDS, A DEVICE ATTACHABLE FROM THE EXTERIOR OF SAID TANK FOR FILLING SAID TANK TO A PRE-DETERMINED LEVEL, SAID DEVICE COMPRISING AN INLET COUPLING ATTACHED TO SAID TANK AND INCLUDING AN INLET FLUID OPENING DISPOSED ON THE EXTERIOR OF SAID TANK, AN EXTERIOR BLEEDER ORIFICE, AND A DISCHARGE OPENING IN COMMUNICATION WITH THE INTERIOR OF SAID TANK, A SPRING PRESSED PORTED VALVE SHIFTABLY DISPOSED WITHIN SAID COUPLING COVERING SAID DISCHARGE OPENING AND FORMING FIRST AND SECOND FLUID CHAMBERS, SAID VALVE BEING SHIFTABLE IN RESPONSE TO FLUID PRESSURE DIFFERENTIAL BETWEEN SAID CHAMBERS TO UNCOVER SAID DISCHARGE OPENING TO THEREBY ALLOW THE FLOW OF FLUID THROUGH SAID COUPLING FROM THE EXTERIOR TO THE INTERIOR OF SAID TANK, MEANS CARRIED BY SAID COUPLING AND FORMING A FLUID PATH WITHIN SAID COUPLING FROM SAID SECOND CHAMBER TO SAID BLEEDER ORIFICE, MEANS WITHIN SAID COUPLING FOR CLOSING SAID INLET ORIFICE, REGULATING APPARATUS DISPOSED ON THE EXTERIOR OF SAID TANK AND HAVING MEANS RESPONSIVE TO THE FLUID LEVEL WITHIN SAID TANK, AND EXTERIOR CONDUIT MEANS CONNECTING SAID APPARATUS AND SAID BLEEDER ORIFICE WHEREBY THE PRESSURES IN SAID CHAMBERS ARE EQUALIZED WHEN THE FLUID IN SAID TANK REACHES SAID PRE-DETERMINED LEVEL.