Pipe joint seal rings
AssigneeAtlantic Richfield Company
InventorDavid H. Patrick
Life of this patent
Estimating the term…
Abstract
An improved seal ring comprising a polymeric material ring in combination with a softer polymeric material ring. The seal ring can be used in either male or female fittings and is adapted to seal by mating engagement of the polymeric material with one set of threads and a recess in the other set of threads.
Claims26
In a threaded pipe joint comprising a pipe section including an external threaded portion and a pipe fitting including an internal threaded portion matingly engaging said external threaded portion wherein at least one polymeric material seal ring means is positioned in at least one recess positioned in at least one of said threaded portions and matingly engages the other threaded portion, the improvement comprising positioning a softer polymeric material on the portion of said polymeric material seal ring opposite the surface of said polymeric material seal ring engaging said other threaded portion.
In a pipe fitting having an internal threaded portion adapted to matingly engage a pipe having an exterior threaded portion and a recess in said internal threaded portion containing a polymeric material seal ring adapted to matingly engage said exterior threaded portion, the improvement comprising positioning a softer polymeric material outside said polymeric material seal ring in said recess.
In a pipe having an external threaded portion adapted to matingly engage a pipe fitting having an internal threaded portion and a recess in said external threaded portion containing a polymeric material seal ring adopted to matingly engage said interior threaded portion, the improvement comprising;
- positioning a softer polymeric material inside said polymeric material seal ring in said recess.
A sealing ring comprising an inner ring of a polytetrafluorsethylene having a Shore D Scale hardness of at least about 45 and an outer ring of a softer polymeric material having a Shore A Scale hardness from about 70 to about 100, said inner ring and said outer ring being joined to form said sealing ring.
A sealing ring comprising an outer ring of a polytetrafluoroethylene having a Shore D Scale hardness of at least about 45 and an inner ring of a softer polymeric material having a Shore A Scale hardness from about 70 to about 100 said inner ring and said outer ring being joined to form said sealing ring.
Dependencies are inferred from the claim text.