Floating restrictor for dispensing nozzle

Claim 1

IN A VACUUM TRIP NOZZLE HAVING A CONTROL VALVE; A VALVE BODY HAVING A FLOW PASSAGE THERETHROUGH WITH A VENTURI PORTION HAVING A THROAT, A VALVE SEAT IN THE VENTURI PORTION ON THE UPSTREAM SIDE OF SAID THROAT, A MAIN VALVE MEMBER IN THE FLOW PASSAGE ENGAGEABLE WITH SAID SEAT, A PISTON ATTACHED TO THE UPSTREAM SIDE OF SAID VALVE MEMBER, A CYLINDER PORTION IN THE VALVE BODY IN WHICH THE PISTON IS RECIPROCABLE, A FRUSTO-CONICAL SHAPED RESTRICTOR PLUG ATTACHED TO THE FACE OF SAID VALVE MEMBER AND EXTENDING THROUGH SAID THROAT INTO THE DOWNSTREAM SIDE OF SAID VENTURI PORTION, A COIL SPRING DISPOSED IN SAID CYLINDER URGING THE VALVE MEMBER TOWARDS SAID SEAT, PASSAGE MEANS EXTENDING THROUGH SAID VALVE MEMBER, PISTON, AND PLUG CONNECTING THE INTERIOR OF SAID CYLINDER WITH THE SAID VENTURI PORTION ON THE DOWNSTREAM SIDE OF SAID THROAT, A PILOT VALVE MEMBER WITHIN SAID PISTON AND CONTROLLING SAID FLOW PASSAGE DOWNSTREAM OF SAID SEAT, A ROD ATTACHED TO SAID PILOT VALVE AND EXTENDING RECIPROCABLY THROUGH SAID VALVE MEMBER FROM THE UPSTREAM SIDE THEREOF, SAID ROD HAVING LOST MOTION MEANS FOR ABUTTING SAID MAIN VALVE MEMBER ON THE DOWNSTREAM SIDE THEREOF AND SAID MAIN VALVE REMAINING SEATED UNDER THE BALANCING FLUID PRESSURE CONDITIONS, SAID ROD BEING RECIPROCABLE TO CAUSE LIFTING OF SAID MAIN VALVE MEMBER SLIGHTLY OFF ITS SEAT UPON MOVEMENT OF SAID PILOT VALVE TO ITS FULLY OPEN POSITION, SAID LIFTING OF THE MAIN VALVE MEMBER OFF ITS SEAT EXPOSING THE FACE THEREOF TO PRESSURE ON THE UPSTREAM SIDE OF THE THROAT OF SAID VENTURI PORTION WHEREBY SAID MAIN VALVE IS ACTED ON BY DIFFERENTIAL PRESSURE CAUSING IT TO FLOAT AWAY FROM ITS SEAT UNDER THE RESULTING INFLUENCE OF SAID DIFFERENTIAL PRESSURE AND THE SAID SPRING ACTING THEREON, MEANS COMPRISING A RESTRICTED VENT BETWEEN SAID CYLINDER AND THE FLOW PASSAGE UPSTREAM OF SAID VENTURI PORTION, AND SAID MAIN VALVE MEMBER BEING MOVABLE ON SAID ROD FROM SAID SLIGHTLY OPEN POSITION TO ITS FULLY OPEN POSITION WHILE SAID ROD REMAINS IN ONE AND THE SAME POSITION.