Dispensing valve with consistency control

Claim 1

A VALVE FOR A RECEPTABLE CONTAINING A FLUID TO BE DISPENSED THEREFROM BY A GASEOUS MEDIUM UNDER PRESSURE CONFINED WITHIN THE RECEPTACLE, WHICH VALVE COMPRISES A BODY HAVING AN UPPER CHAMBER PORTION, A TUBULAR LOWER CHAMBER PORTION EXTENDING DOWNWARDLY FROM SAID UPPER PORTION AND FORMED WITH A FIRST INLET AT ITS LOWER END FOR THE FLUID AND WITH A SECOND INLET IN ITS SIDE WALL AT ITS UPPER END FOR THE GASEOUS MEDIUM, AND A VALVE SEAT EXTENDING ACROSS SAID UPPER CHAMBER PORTION FORMED WITH AN OUTLET FACING SAID LOWER CHAMBER PORTION; A MOVABLE VALVE MEMBER POSITIONED BETWEEN SAID UPPER CHAMBER PORTION AND SAID VALVE SEAT ENGAGING SAID VALVE SEAT AND HAVING A FORMATION FOR CLOSING SAID VALVE SEAT OUTLET; A PISTION SLIDABLY MOUNTED IN SAID LOWER CHAMBER PORTION HAVING PASSAGEWAY MEANS INCLUDING A LOWER INLET AND AN UPPER OUTLET FOR ESTABLISHING FLUID FLOW COMMUNICATION BETWEEN SAID UPPER CHAMBER PORTION AND SAID FIRST VALVE BODY INLET WHEN SAID PISTON IS IN UPPER AND LOWER VALVE OPENING POSITIONS FOR ESTABLISHING FLUID FLOW COMMUNICATION BETWEEN SAID SECOND VALVE BODY INLET AND SAID UPPER CHAMBER PORTION ONLY WHEN SAID PISTON IS IN A LOWER VALVE OPENING POSITION; A SPRING FOR URGING THE UPPER END OF SAID PISTON AGAINST THE UNDERSIDE OF SAID VALVE MEMBER; AND VALVE OPERATING MEANS FOR UNSEATING SAID VALVE MEMBER AND EFFECTING DOWNWARD MOVEMENT OF SAID PISTON.