Patent ID: 6139026
Filing Date: 2000-10-31
Classification: F16L,Y10S

Abstract:
A sealing gasket for sealing a flange face, said gasket comprising:a) a metal ring defined by inside and outside circumferences, by widely separated outwardly directed parallel surfaces defining the maximum thickness of the ring, narrowly separated parallel surfaces defining opposing depressed portions in the ring and by opposing shoulders each of which connects one of the widely separated parallel surfaces to one of the narrowly separated parallel surfaces, each shoulder being perpendicular to the parallel surfaces and having a surface that faces the inside circumference, each of said widely separated parallel surfaces being covered by at least one reinforced fluoropolymer sheet having inside and outside surfaces positioned so that the inside surface of the sheet is facing and covering at least one of the widely separated parallel surfaces and so that the outside surface faces outwardly;b) at least two O rings having outside diameters about equal to a diameter of the shoulder and having a thickness sufficient to extend beyond the outside surface of the reinforced fluoropolymer sheet when each O ring is positioned so that it is at least partly within one of the opposing depressed portions, so that the outside diameter of the O ring is proximate the face of the shoulder; andc) a fluoropolymer protective shield covering at least the outside surfaces of the at least one reinforced fluoropolymer sheet, the narrowly separated parallel surfaces of the metal ring and the inside circumference of the metal ring.