Abstract: A seal assembly is for a closure element of a valve assembly including a valve body with a flow passage and an annular seat extending about the passage, the closure element being linearly displaceable along a central axis and including a cylindrical body. The seal assembly includes an outer seal including an annular body formed of a polymeric material and having a centerline, an inner circumferential surface defining a seal bore, an outer circumferential surface, and opposing first and second axial ends, the first axial end having a generally radially-extending, annular sealing surface sealingly engageable with the valve seat. An inner connector includes a generally annular body formed of a substantially rigid material and disposed at least partially within the seal bore, the connector body having an inner circumferential surface frictionally engageable with the valve body outer surface to couple the seal with the closure element.

Abstract: A seal assembly is for a closure element of a valve assembly including a valve body with a flow passage and an annular seat extending about the passage, the closure element being linearly displaceable along a central axis and including a cylindrical body. The seal assembly includes an outer seal including an annular body formed of a polymeric material and having a centerline, an inner circumferential surface defining a seal bore, an outer circumferential surface, and opposing first and second axial ends, the first axial end having a generally radially-extending, annular sealing surface sealingly engageable with the valve seat. An inner connector includes a generally annular body formed of a substantially rigid material and disposed at least partially within the seal bore, the connector body having an inner circumferential surface frictionally engageable with the valve body outer surface to couple the seal with the closure element.

Abstract: A seal assembly includes a generally annular primary seal member formed of a first, generally compressible polymeric material. The primary seal member has inner and outer radial ends, a first axial end disposeable against a first tubular member end surface and a second axial end disposeable against the second tubular member end surface. The first axial end has a radially-extending, generally annular primary sealing surface sealingly engageable with the first tubular member end surface. A generally annular secondary seal member is formed of a second, generally rigid polymeric material. The secondary seal member has two opposing axial ends and a radially-extending, generally annular secondary sealing surface on a first axial end. The secondary seal member is coupled with the first seal member such that the secondary sealing surface extends generally coaxially about the primary sealing surface, the secondary sealing surface being sealingly engageable with the first tubular member end surface.

Abstract: A seal for sealing between inner and outer bodies includes a generally annular sealing member having inner and outer circumferential sealing surfaces, at least one of the inner and outer sealing surfaces being sealingly engageable with one of the inner body outer surface and the outer body inner surface. The sealing member further has an interior surface at least partially defining a generally annular interior cavity, an opening extending into the cavity, and at least one locking tab extending from the interior surface and into the cavity. An annular biasing member is disposed within the sealing member cavity and configured to bias the at least one sealing surface generally toward the at least body surface. The biasing member has at least one engagement recess configured to receive at least a portion of the at least one locking tab such that the biasing member is retained within the cavity.