The invention relates to a mechanical seal arrangement comprising a mechanical seal (2) having a rotating seal ring (21) and a stationary seal ring (22) defining a seal gap (23) therebetween, a secondary seal (3) arranged on a back surface of one of the seal rings facing away from a sealing surface of the seal ring, the secondary seal (3) being made of a base material and having a coating (7) such that a material bond is formed between the coating (7) and the base material of the secondary seal, the secondary seal (3) being made of a base material and having a coating (7) such that a substance-to-substance connection is formed between the coating (7) and the base material of the secondary seal, a sleeve-shaped member (4) arranged radially inside the secondary seal (3), wherein a gap (5) having a gap height (H) is present between the sleeve-shaped component (4) and a region of one of the sliding rings facing radially inwards, the secondary seal (3) seals against the back side of this slide ring and the sleeve-shaped component (4), wherein the coating (7) is provided on a first side (31) of the secondary seal (3), which first side facing the sliding ring, and a second side (32) of the secondary seal (3) which second side facing the sleeve-shaped component (4), wherein a stiffness of the coating (7) is greater than a stiffness of the base material of the secondary seal (3) and wherein a thickness (D) of the coating is smaller than or equal to a gap height (H) of the gap (5).

The shape of a back-up ring is a V-shaped sectional shape. In the back-up ring, an annular concave surface part having a V-shaped sectional shape serving as a valley toward a high-pressure side is formed on a surface part on a side that faces a seal ring, and an annular convex surface part having a V-shaped sectional shape serving as a peak toward a low-pressure side is formed on a surface part opposite to the side that faces the seal ring. When a high pressure is applied from a high-pressure side, the back-up ring is deformed such that V-shaped angles of an annular concave surface part and an annular convex surface part are increased as the annular concave surface part is pressed against the seal ring, and is brought into close contact with a housing and a shaft.

A back-up ring (1) for a gland seal includes at least two part ring portions (2,4). Each part ring portion comprises first (6, 10) and second (8, 12) ends. Each end has an undulating surface (22, 24) for overlapping in engagement with a corresponding undulating surface on an end of another part ring portion, to form the back-up ring (1). When the part ring portions (2,4) are assembled to form the back-up ring (1) and are held together by axial and/or radial compression, the engagement of the undulating surfaces (22, 24) restricts relative movement between the part ring portions. A seal assembly (34) including the back-up ring (1) is also disclosed.

Disclosed is a swivel including inner and outer mutually rotatable swivel members having respective inner fluid paths communicating with each other through an annular space at an interface between the swivel members and being provided with a sealing arrangement on a side of the annular space at the interface including a peripheral groove provided in the inner and/or outer swivel member, and a sealing element received therein and arranged for static sealing against a first one of the swivel members, inside the groove and for dynamic sealing against a second one of the swivel members, a surface inside the groove in the first one of the swivel members abutting the sealing element being a textured surface extending along at least a part of one or more inner surfaces of the groove and having three-dimensional textural elements for making frictional contact with the sealing element.

A seal including: an annular jacket including a heel, a first lip, and a second lip defining an annular recess; and an insert including at least 3 prongs disposed within the annular recess contacting the heel, the first lip, and the second lip.

A spiral wound header ring is provided. The spiral wound header ring comprises at least one outer fabric layer and at least one spiral of inner fabric and rubber. The spiral wound header ring further may have a sealing surface that extends from a rearward facing surface to the forward facing annular, radially extending, surface.

A pressure-tight stein cylinder seal and a self-energizing stein shoulder seal matching the stein cylinder seal that both use an equilaterally triangular soft ring as their sealing element, wherein their designing rules are first, by means of wedging function of a hard gland coaxial with the stein cylinder, to convert their original axial tightening force 2f respectively into a radial compression force 4f/√3 of their soft ring 04 on the stein 02 cylinder and another radial compression force 2f of their soft ring 06 on the stein 02 shoulder and ensure that the two soft rings are so compressed from a great room to a small room as to be able to pass a pressure or stress exactly to each different direction, then to cut off their off-stein corners to give their cavities an opening or give each soft ring an axial compressing allowance, and last, by means of anti-extrusion metallic C-rings without axial resistance, to close each opening to provide a full support for the sealing deformation of their soft rings compressed in their cavities.

A sealing structure enables easy fitting of an endless backup ring and includes: tank main body having filling chamber body with filling chamber and mouthpiece portion formed in cylindrical shape integrally with filling chamber body; valve body having insertion portion inserted in mouthpiece portion; O-ring provided between mouthpiece portion and insertion portion; and first backup ring endless and disposed on one side of O-ring to restrict movement of O-ring, wherein annular housing groove is formed on inner circumferential surface of mouthpiece portion such as to be recessed outward with respect to radial direction in order to house O-ring and first backup ring, wherein mouthpiece portion is provided with first cylindrical portion integral with filling chamber body and second cylindrical portion attachable/detachable along axial direction to/from first cylindrical portion, and wherein housing groove is divided along axial direction to face outward when second cylindrical portion detaches from first cylindrical portion.

The invention is a sealing assembly for equipment with movable shafts—such as coaxial and side port swivels, hydraulic swivels, and rotary control devices—that prevents the loss of a high pressure fluid through the clearance existing between a housing and the shaft. The invention is disclosed in the context of a coaxial swivel that conducts high pressure fluid from a stationary first conduit to a rotating second conduit that has dynamic runout, and may be misaligned relative to the first conduit.

A seal can include a body including a thermoplastic material and a filler material including a fluoropolymer. The fluoropolymer can include a modified fluoropolymer. The body can include an elongation-at-break of at least 3%. In an embodiment, the seal can include a seal ring, wherein the body of the seal ring can include a weld.