Valve stem packing assemblies may include at least one end ring and at least one sealing ring. The at least one end ring may include an inner ring and an outer ring. Valves include a valve body, a valve stem, and a valve stem packing assembly.

The present invention is directed to use of a combined seal involving a compression seal coupled with a metal-to-metal seal for use on the suction and discharge side of the plunger portion of a reciprocating pump. This combined seal results in less vibratory movement and better pumping during use of the pump, and an overall more efficient pump based on the improved seal.

Provided is a composite seal member that can maintain performance such as vacuum seal performance, plasma resistance, and corrosive gas resistance over a long period. The composite seal member is mounted in a seal groove provided in a body surface of a first member, and establishes a sealed state between the first member and a second member when the second member is moved closer toward the first member. The composite seal member includes a first seal member disposed on the side of a first side wall of the seal groove and made of an elastic member, and a second seal member disposed on the side of a second side wall of the seal groove and made of a material that is harder than the first seal member. The second seal member has at least a second side wall abutment surface that extends generally in parallel with and makes surface contact with the second side wall of the seal groove, and a seal abutment surface that extends generally in parallel with a seal surface of the second member, and that makes surface contact with the seal surface of the second member in the sealed state.

A sealing structure includes a first connector body having a groove, a second connector body encompassing the first connector body, an O-ring partially received in the groove of the first connector body, and a variable back-up ring partially received in the groove of the first connector body and holding the O-ring. The variable back-up ring is deformable in a radial direction depending on a magnitude of a fluid pressure applied between the first connector body and the second connector body.

A header ring for use in a stuffing box comprising an annular body portion of an elastomeric material, an annular radially inward projecting sealing lip portion formed on said body portion and an annular, axially facing pedestal portion formed on said body portion, said pedestal portion defining an annularly extending radially inwardly facing pedestal surface, the sealing lip portion defining an annularly extending, radially inward facing sealing surface, the sealing surface and the pedestal surface forming a juncture, at least a portion of the pedestal portion adjacent the juncture and forming the pedestal surface and at least a portion of the sealing lip portion adjacent the juncture and forming a portion of the sealing surface being comprised of a layer of reinforced elastomeric material bonded to the body portion.

In one embodiment, the invention is directed to a high-pressure bi-directional sealing system having circumferentially extending outer support rings (1520, 1900), annular, axial seals (1600, 1800) between the outer support rings (1520, 1900) and a circumferentially extending inner support ring (1700) located between the annular, axial seals (1600, 1800). The outer support rings (1520, 1900), seals (1600, 1800), and circumferentially extending inner support ring (1700) are located within a space between an outer tube (1502) and an inner tube (1504) that is telescopically disposed within the outer tube (1502). Seals (1600) and (1800) are oriented in opposite directions. Specifically, the opening of seal (1600) is facing in a first direction and the opening of seal (1800) is facing in a second direction that is opposite the first direction. This configuration enables the high-pressure bi-directional sealing system to handle pressure in both directions.

A seal structure of a high-pressure tank including: the first member in which a tank chamber is formed inside; and the second member which is fitted into the opening hole of the first member and provided with an annular groove formed on an outer peripheral surface, the seal structure includes: a seal member, having an annular shape, configured to be disposed on the tank chamber side in the groove; and a first back-up member and a second back-up member configured to be disposed further to the side opposite to the tank chamber side than the seal member in the groove, to include inclined surface parts respectively opposite to each other. The inclined surface part of the first back-up member includes a crest folding corner part in which a first low angle inclined part and a first high angle inclined part are connected to each other.

A large-gap-seal (LGS) assembly and methods for its assembly and use are described. The LGS assembly has an elastomer core surrounded by adjoining structural segments. Non-adjoining gap segments are located on the sidewall surfaces of the elastomer core, with each gap segment approximately centered beneath the edges of two adjoining structural segments. The gap segments are exposed by the spaces that form between the structural segments when the LGS assembly is activated. Exposing the gap segments rather than the elastomer core protects the elastomer core from damage and preserves the integrity of the seal between the isolation tool and the inner wall of the pipeline.

A sealing arrangement having inboard and outboard dynamic seals in a housing separated by a barrier fluid and having a sealed relationship with a relatively movable bearing-guided shaft. A bearing chamber having bearing lubricant exposed to the inboard dynamic seal. The inboard dynamic seal is a hydrodynamic seal having a hydrodynamic pumping action in response to relative rotation between the shaft and the inboard dynamic seal. The hydrodynamic pumping action forcing a film of the bearing lubricant between the inboard dynamic seal and the shaft. The hydrodynamic pumping-related leakage of the inboard dynamic seal being returned to the bearing chamber in which the shaft guidance bearings are located.

A header ring for use in a stuffing box comprising an annular body portion of an elastomeric material, an annular radially inward projecting sealing lip portion formed on said body portion and an annular, axially facing pedestal portion formed on said body portion, said pedestal portion defining an annularly extending radially inwardly facing pedestal surface, the sealing lip portion defining an annularly extending, radially inward facing sealing surface, the sealing surface and the pedestal surface forming a juncture, at least a portion of the pedestal portion adjacent the juncture and forming the pedestal surface and at least a portion of the sealing lip portion adjacent the juncture and forming a portion of the sealing surface being comprised of a layer of reinforced elastomeric material bonded to the body portion.