US 12,404,934 B2
Fire-resistant seal assemblies
Devin Prate, Philadelphia, PA (US); Steve Okladek, Bethlehem, PA (US); and Laurence S. London, Lansdale, PA (US)
Assigned to Greene, Tweed Technologies, Inc., Wilmington, DE (US)
Filed by Greene, Tweed Technologies, Inc., Wilmington, DE (US)
Filed on Sep. 5, 2023, as Appl. No. 18/461,472.
Application 18/461,472 is a continuation of application No. 17/013,652, filed on Sep. 7, 2020, abandoned.
Application 17/013,652 is a continuation of application No. PCT/US2019/021710, filed on Mar. 11, 2019.
Claims priority of provisional application 62/640,961, filed on Mar. 9, 2018.
Prior Publication US 2024/0209945 A1, Jun. 27, 2024
Int. Cl. F16J 15/3284 (2016.01)
CPC F16J 15/3284 (2013.01) 27 Claims
OG exemplary drawing
 
1. A fire-resistant seal assembly, comprising:
a first seal comprising an elastomeric material;
a first anti-extrusion seal having a first seal-facing surface for receiving the first seal, wherein the first seal-facing surface defines a groove extending along the first seal-facing surface, and an exterior surface, that when viewed in a longitudinal cross section, has a truncated V-shaped portion and beveled end portions configured for sealing contact with a gland;
at least one second anti-extrusion seal having a second seal-facing surface for receiving the first anti-extrusion seal, wherein the second seal-facing surface defines a groove extending along the second seal-facing surface, and an exterior surface that, when viewed in a longitudinal cross section, has a truncated V-shaped portion and beveled end portions configured for sealing contact with the gland, wherein the exterior surface of the first anti-extrusion seal is positioned at least partially within the groove of the at least one second anti-extrusion seal such that a portion of the exterior surface of the first anti-extrusion seal contacts the second seal-facing surface of the at least one second anti-extrusion seal; and
at least one backer ring having a third seal-facing surface for receiving the at least one second anti-extrusion seal, wherein the third seal-facing surface defines a groove extending along the third seal-facing surface, and an exterior surface that, when viewed in a longitudinal cross section, has a truncated V-shape, wherein the exterior surface of the at least one second anti-extrusion seal is positioned at least partially within the groove of the at least one backer ring such that a portion of the exterior surface of the at least one second anti-extrusion seal contacts the third seal-facing surface of the at least one backer ring,
wherein the first anti-extrusion seal comprises a first polymeric material, and the second anti-extrusion seal comprises a second polymeric material;
wherein a decomposition temperature of the first polymeric material of the first anti-extrusion seal is higher than a decomposition temperature of the elastomeric material of first seal;
wherein a decomposition temperature of the second polymeric material of the at least one second anti-extrusion seal is higher than a decomposition temperature of the first polymeric material of the first anti-extrusion seal; and
wherein a decomposition temperature is a temperature at which a seal decomposes, deteriorates, or irreversibly fails such that the seal is no longer able to form a seal with a gland.