Air valve apparatus

Claim 1

A FLUID VALVE COMPRISING A BODY HAVING A LONGITUDINAL BORE DEFINED THERETHROUGH WITH A SUBSTANTIALLY VERTICAL INTERSECTING BORE INTERSECTING SAID LONGITUDINAL BORE, A SEAT FITTING MEMBER CONNECTED INTO SAID INTERSECTING BORE, A STEM EXTENDING THROUGH SAID SEAT FITTING AND HAVING A PLUNGER PORTION OF WIDER DIAMETER THAN SAID STEM LOCATED IN SAID INTERSECTING BORE, SAID SEAT FITTING HAVING AN INTERIOR RECESS PORTION DEFINED IN A FACE ADJACENT SAID PLUNGER PORTION IN WHICH SAID PLUNGER PORTION IS SLIDABLE, AN O-RING DISPOSED IN SAID RECESS AND AROUND SAID STEM ADJACENT SAID PLUNGER PORTION AND PROVIDING A SEAL IN SAID RECESS PORTION OF SAID SEAT FITTING, SAID PLUNGER BEING MOVABLE AWAY FROM SAID LONGITUDINAL BORE ON APPLICATION OF FLUID PRESSURE TO SAID LONGITUDINAL BORE, SAID INTERSECTING BORE DEFINING A CAVITY BELOW SAID LONGITUDINAL BORE, SAID BODY HAVING A VALVE SEAT FORMED AROUND THE LONGITUDINAL BORE AT THE JUNCTURE WITH SAID INTERSECTING BORE ON THE DOWNSTREAM SIDE, AN O-RING POSITIONED IN SAID VALVE SEAT, A BALL IN SAID INTERSECTING BORE ADAPTED TO BE FORCED INTO SEATING ENGAGEMENT WITH SAID O-RING BY FLUID PRESSURE FLOWING THROUGH SAID LONGITUDINAL BORE TOWARD SAID VALVE SEAT, SAID STEM BEING DEPRESSIBLE FROM THE EXTERIOR OF SAID SEAT FITTING TO CAUSE SAID PLUNGER PORTION TO MOVE THE BALL DOWNWARDLY INTO SAID CAVITY TO PERMIT A FLOW OF FLUID THROUGH SAID LONGITUDINAL BORE AND THROUGH THE PORTION THEREOF FORMALLY COVERED BY THE BALL ON SAID VALVE SEAT.