Conical valve plug

Claim 1

IN A VALVE ASSEMBLY, A VALVE SEAT COMPRISING A RIGID MEMBER HAVING A RECESSED SEATING FACE OF SUBSTANTIALLY SPHERICAL CONFIGURATION, AND A VALVE PLUG COOPERATING THEREWITH TO FORM A ZERO LEAK SEAL, SAID VALVE PLUG COMPRISING A RIGID MEMBER SHAPED IN THE FORM OF A FRUSTUM OF A RIGHT CIRCULAR CONE HAVING A WALL UNIFORMLY DIMINISHING IN THICKNESS FROM THE TOP OF SAID FRUSTUM TO THE BOTTOM OF SAID FRUSTUM, SAID RIGHT CIRCULAR CONE BEING GENERATED BY A RIGHT TRIANGLE, THE HYPOTENUSE OF WHICH FORMS AN ANGLE WITH THE GENERATING LEG OF THE TRIANGLE IN THE RANGE OF 8* TO 18*, THE BASE OF SAID FRUSTUM BEING DISH-SHAPED, THE BOTTOM OF SAID WALL TERMINATING IN AN ANNULAR SEATING SURFACE, SAID SURFACE BEING PERPENDICULAR TO THE HYPOTENUSE OF A MEAN GENERATING TRIANGLE OF THE RIGHT CIRCULAR CONE, SAID HYPOTENUSE OF SAID MEANS TRIANGLE OF THE GENERATING CONE BEING COEXTENSIVE WITH A GREAT CIRCLE OF THE SPHERICAL SEAT, SAID SEATING SURFACE BEING ADAPTED TO COOPERATE WITH SAID VALVE SEAT, SAID SEATING SURFACE BEING ADAPTED TO COOPERATE WITH SAID VALVE SEAT SEATING FACE TO FORM SAID ZERO LEAK SEAL, SAID WALL UNIFORMLY DIMINISHING IN THICKNESS SO AS TO UNIFORMLY DISTRIBUTE THE LOAD THROUGHOUT THE WALL DURING THE SEATING OF THE VALVE PLUG IN THE VALVE SEAT.