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US 4,230,325 AGranted
Conjugate two-piece packing ring with limiter
OwnerPayson M. Butler, Jack O. Butlerinventors
Life of this patent
Estimating the term…
Abstract
A particularly durable two-piece packing ring for sealing fixed and reciprocating cylindrical elements such as sight glasses of steam boilers, puff iron valves and the like where gland nut assemblies are required to seal such tubes and rods, this packing ring being entirely non-metallic and in two mating parts, that is, an outer ring and an inner ring with preferably differently tapered confronting faces to be forced together by a gland nut for a limited interface sealing contact.
Claims2
A conjugate packing ring for sealing fixed and cylindrical elements, using a gland nut, said packing ring, comprising:
- a substantially rigid, slightly compressible inner ring, of non-metallic material and discrete from said elements, having a cylindrical bore for snug reception of one of said elements and having a smooth external, tapered surface and having two flat faces normal to the axis of said bore;
- and
- an outer ring, of non-metallic material and discrete from said elements, encircling said inner ring and having a tapered bore receiving the tapered external surface of the internal ring in intersealing relationship therewith and having two flat end faces and being capable of near zero expansion in use with a gland nut pressing said inner ring between said outer ring and said one of the elements, said inner ring having an annular shoulder extending radially outwardly of the inner ring and between the larger end of said tapered external surface and the flat end face at that end, said shoulder limiting the penetration of the inner ring into the outer ring and providing sealing contact with the corresponding one of said end faces of said outer ring when said gland nut is sufficiently tightened.
Dependencies are inferred from the claim text.