Patent ID: 7021632
Filing Date: 2006-04-04
Classification: F16J,Y10T

Abstract:
1. In an annular secondary seal gasket for a mechanical seal, said gasket having inner and outer circumferential surfaces extending circumferentially about a center axis and axially parallel to said axis, and further having opposite closed and grooved end faces which extend radially and face in opposite axial directions, said gasket including a groove opening through said grooved end face to define radially spaced apart inner and outer gasket legs such that said gasket has a U-shaped cross sectional shape, an interior biasing unit being disposed in said groove to bias said gasket legs radially, comprising the improvement wherein said gasket is formed of graphite, said gasket comprising an L-shaped gasket section formed of first graphite ribbon which is annular, said L-shaped gasket section having an L-shaped cross section defined by an axial ribbon section and a radial ribbon section extending radially from said axial ribbon section, said gasket further comprising an overwrap gasket section formed of second graphite ribbon which comprises a plurality of wraps of graphite ribbon wrapped circumferentially about said axial ribbon section, said groove extending axially into said overwrap gasket section.