Safety shut-off valve for use in a fuel transmitting conduit

Claim 1

A SAFETY SHUT OFF VALVE FOR SAFELY REGULATING THE FLOW OF FUEL FROM A FUEL SUPPLY SOURCE UNDER PRESSURE TO A BURNER, COMPRISING A VALVE BODY OF A SINGLE CONSTRUCTION FORMING AN INLET PASSAGEWAY CONNECTED TO THE FUEL SUPPLY SOURCE, AN OUTLET PASSAGEWAY CONNECTED TO THE BURNER AND A CENTRAL PASSAGEWAY EXTENDING BETWEEN THE INLET AND OUTLET PASSAGEWAYS, THE CENTRAL PASSAGEWAY HAVING TWO SPACED APART INTERIOR WALL PORTIONS, A FIRST ONE OF THE INTERIOR WALL PORTIONS FORMING A FIRST SEAT AT THE INLET END OF THE CENTRAL PASSAGEWAY AND THE OTHER ONE OF THE INTERIOR WALL PORTIONS FORMING A SECOND SEAT AT THE OUTLET END OF THE CENTRAL PASSAGEWAY, A FIRST PLUG MOUNTED WITHIN THE BODY ON A STEM FOR MOVEMENT TOWARD AND INTO ENGAGEMENT WITH THE FIRST SEAT, A SECOND PLUG MOUNTED ON THE STEM FOR MOVEMENT TOWARD AND INTO ENGAGEMENT WITH THE OTHER REMAINING SECOND SEAT, A LOST MOTION MEANS CONNECTED WITH THE BODY, THE STEM AND FIRST PLUG TO ENABLE THE FIRST PLUG TO BE BROUGHT INTO ENGAGEMENT WITH ITS SEAT BEFORE THE SECOND PLUG IS BROUGHT INTO ENGAGEMENT WITH ITS ASSOCIATED SEAT, THE CENTRAL PASSAGEWAY BETWEEN THE FIRST AND SECOND SEATS OF THE VALVE BODY HAVING A WALL PORTION FORMING A VENT THERETHROUGH, THE INNER SURFACE OF THE LAST WALL PORTION FORMING A THIRD VALVE SEAT, AND A THIRD VALVE PLUG OPERABLY CONNECTED FOR MOVEMENT WITH THE PORTION OF THE STEM EXTENDING BETWEEN THE FIRST AND SECOND PLUGS OUT OF SEATING ENGAGEMENT WITH ITS THIRD VALVE SEAT TO VENT THE CENTRAL PASSAGEWAY AND THE FUEL REMAINING IN THE OUTLET CONNECTED TO THE BURNER AFTER THE FIRST PLUG IS SEATED ON ITS INLET SEAT AND BEFORE THE SECOND PLUG HAS BEEN SEATED ON ITS OUTLET SEAT.