Patent ID: 6460559
Filing Date: 2002-10-08
Classification: F16K,Y10T

Abstract:
A method of fabricating a sealing device for interacting with a flow-control element of a valve for controlling the flow of a fluid, said method comprising the steps of:providing a cylinder of a toughened refractory material having a bore formed therethrough such that the bore defines an axis and is adapted to cooperate with the flow-control element to control the flow of a fluid through the bore; forming a seating surface in the cylinder; forming a circumferentially and axially extending channel in the cylinder opposing the seating surface, the channel extending into the cylinder concentrically with the bore and thereby forming a generally cylindrical spring blank radially outward of the channel and a generally cylindrical spring shield radially inward of the channel such that the bore is defined by an inner surface of the spring shield; and forming a spiral groove in the spring blank so as to fabricate a biasing device such that the seating surface, the spring shield, and the biasing device comprise an integral structure.