Valve construction and method

Claim 1

IN A VALVE CONSTRUCTION FOR CONTROLLING FLUID FLOW WHEREIN BODY AND VALVE PARTS ARE RELATIVELY MOVABLE BETWEEN OPEN AND CLOSED POSITIONS AND HAVE COOPERATING VALVE WORKING SURFACES, ONE OF SAID PARTS HAVING AN ANNULAR RECESS FORMED THEREIN AND DEFINED BY AT LEAST ONE CYLINDRICAL SURFACE AND A BOTTOM SURFACE, A SEAL RING FORMED OF RESILIENT MATERIAL DISPOSED WITHIN SAID RECESS AND WITH ON PERIPHERAL SURFACE OF THE SAME ADJACENT SAID CYLINDRICAL SURFACE, AND RING BEING SEALED WITH RESPECT TO SAID ONE PART, ONE END FACE OF SAID RING ENGAGING THE VALVE WORKING SURFACE OF THE OTHER VALVE PART TO FORM A SEAL THEREWITH, SNAP-IN MEANS ACTING BETWEEN SAID CYLINDRICAL SURFACE AND SAID PERIPHERAL SURFACE OF THE SEAL RING FOR RETAINING THE SEAL RING WITHIN SAID RECESS WITHOUT PREVENTING OPERATING MOVEMENTS OF THE SAME, AND SPRING MEANS DISPOSED BETWEEN THE BOTTOM SURFACE AND THE SEAL RING FOR URGING SAID SEAL RING TOWARD SAID OTHER PART.