Heat resistant seal

Details Heat resistant seal Heat resistant seal

F - Mech Eng,Light,Heat,Weapons

16

J

277/42

F16J 15/12 (2006.01)

Patent

CA 1189107

ABSTRACT OF THE INVENTION A fire-resistant seal for maintaining sealing contact between the sealing surfaces within a packing box under high temperature differentials between the inner and the outer members of such packing box, comprising one or more graphite-component seal rings for engaging the sealing surfaces of the inner and outer members, metal seal rings above and below the graphite component seals for preventing extrusion of the graphite-component seal rings as well as for establishing metal-to-metal sealing contact between said metal rings and the sealing surfaces of the inner and outer members, and load maintaining means in the form of a metal crushable follower of cylindrical shape, having recessed grooves along its outer and inner perimeters, the gap between said grooves being permanently narrowed to approximately half- closure after applying a predetermined make up load greater than the rated working pressure, which enables said crushable follower to maintain such compressive load on said graphite component seals over a predetermined load range.

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