Patent ID: 9388924
Filing Date: 2016-07-12
CPC Classification: F16J,F16L,Y10T

Claim Text:
1. A method of forming a gasket for sealing opposing flange surfaces of a pipe having corrosive fluid flowing therethrough, the gasket comprising: defining a gasket profile including a serrated profile core, the serrated profile core defining a core thickness and a core inner surface; forming a flange extending radially inward from the core inner surface, the flange defining a flange length, a flange thickness and a flange inner surface; forming a deformable pillow about the flange, extending radially inward from the core inner surface, inward beyond the flange, to define a gasket inner surface wherein the deformable pillow defines a pillow thickness and a pillow material; selecting the pillow material and the pillow thickness to provide a desired minimum inner zone stress level when the deformable pillow material in the inner zone is compressed to a thickness to no less than the core thickness; and the gasket defining an outer, high stress, fire resistant sealing zone about the serrated profile core, an intermediate stress gas/liquid sealing zone between the core inner surface and the flange inner surface, and an inner, low stress liquid sealing zone between the flange inner surface and the gasket inner surface.