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Claim 1

A VALVE COMPRISING: (A) A VALVE BODY HAVING AN INTAKE PASSAGE, A DISCHARGE PASSAGE AND A VALVE CHAMBER POSITIONED BETWEEN SAID PASSAGES, SAID CHAMBER HAVING AN INTERNALLY THREADED OPEN TOP AND HAVING AN OPEN BOTTOM COMMUNICATING WITH SAID INTAKE PASSAGE AND HAVING A SIDE OUTLET COMMUNICATING WITH SAID DISCHARGE PASSAGE; (B) AN ANNULAR SHELF FLANGE SURROUNDING THE OPEN BOTTOM OF SAID CHAMBER; (C) A BODY BUSHING HAVING A DOWNWARDLY EXTENDING ANNULAR FLANGE FORMED THEREON THREADED INTO THE OPEN TOP OF SAID CHAMBER; (D) A VALVE STEM EXTENDING AXIALLY THROUGH SAID BUSHING AND EXTENDING UPWARDLY AND DOWNWARDLY THEREFROM, THE LOWER PORTION OF SAID VALVE STEM BEING REDUCED IN DIAMETER TO ALLOW FLUID FLOW THEREABOUT; (E) AN ENLARGED VALVE HEAD ON THE LOWER EXTREMITY OF SAID VALVE STEM; (F) AN ANNULAR VALVE SEAT ELEMENT HAVING AN AXIAL FLOW PASSAGE SURROUNDING SAID STEM IMMEDIATELY ABOVE SAID VALVE HEAD, SAID SEATING ELEMENT RESTING ON SAID SHELF FLANGE; (G) AN ANNULAR CORRUGATED WASHER SURROUNDING SAID STEM BETWEEN SAID BUSHING AND SAID SEAT ELEMENT AND COMMUNICATING PRESSURE TO FORCE THE LATTER AGAINST SAID SHELF FLANGE, SAID FLANGE ON SAID BUSHING ENTERING SAID CORRUGATED WASHER TO MAINTAIN THE LATTER CONCENTRIC WITH SAID VALVE STEM; AND (H) SPRING MEANS URGING SAID STEM UPWARDLY TO RESILIENTLY MAINTAIN SAID HEAD AGAINST THE BOTTOM OF SAID SEATING ELEMENT SO THAT SAID STEM MAY BE MANUALLY DEPRESSED TO ALLOW FLOW THROUGH SAID SEATING ELEMENT AND THROUGH SAID CORRUGATED WASHER TO SAID DISCHARGE PASSAGE.