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 mechanical seal device comprises a rotating unit (11) and a stationary unit (12) respectively comprising a ring of ceramic material (13, 15) associated with the bottom of a support element (14, 16) of polymeric material shaping a respective sealing face. The rotating unit (11) and the stationary unit (12) are suitable to be coaxially mounted on a shaft (8) of a rotating member (3), in specular position, so that said rings (13, 15) of ceramic material have said seal faces in mutual contact on a plane substantially perpendicular to the axis of the shaft (8).

Provided is a mechanical seal that eliminates the need to provide an additional bearing, enables size reduction and cost reduction, and can provide stable performance as a bearing. A stationary-side seal ring 20 is disposed on the high-pressure fluid side of a rotating-side seal ring 21, and fixed to a housing 1 and has sliding surfaces 20a, 20c, and 20d supporting a rotating shaft 2 in both a radial direction and a thrust direction. The rotating-side seal ring 21 is axially movably fitted by an urging means 25 fitted on the rotating shaft 2. The rotating shaft 2 has an outer peripheral surface 2a a contacting and sliding on the radial sliding surface 20a of the stationary-side seal ring 20 to be supported radially. Thrust rings 10a and 10b are provided between the stationary-side seal ring 20 and the rotating shaft 2, for supporting the rotating shaft 2 in thrust directions.

Seal arrangement (48) comprising a plug member (46) configured to seal a through opening (12) in a wall (10); a pressing section (74); and a cover member (70) configured to be connected to the plug member (46) and configured to force the pressing section (74) to press a sealing element (72), arranged laterally outside the plug member (46), towards the wall (10). A kit of parts and a method for sealing a through opening (12) in a wall (10) and for painting the wall (10) are also provided.

A seal arrangement for a fluid valve includes: a first seal for sealing abutment against a pivotably adjustable valve body of the fluid valve; a second seal for sealing abutment against a valve housing of the fluid valve; and a separate, elastically deformable intermediate piece arranged between a first wall of the first seal and a second wall of the second seal. The intermediate piece has at least one axial section whose cross section has, in relation to the seal opening, a first, radially outer lateral surface and an opposite, second, radially inner lateral surface, and the radially outer lateral surface is at least sectionally concave, and the radially inner lateral surface is at least sectionally convex.

A machine system includes a roller frame and a roller assembly mounted to the roller frame. The roller assembly includes first and second clamping collars positioned upon a roller shaft and each including a lower and an upper collar section. Fasteners clamp the lower and upper collar sections to the roller shaft to form static seals. The clamping collars may be formed with splitlines to enable the clamping collars to deform so as to simulate interference fits with the roller shaft.

A torque-resistant dual face seal includes a seal ring having an L-shaped cross-section including an axially-extending flange and a radially-extending flange, the seal ring including an annular seal face and an opposing loading surface. The seal ring includes a plurality of deformations formed in a spaced apart arrangement circumferentially around the axially-extending flange. An axial cross-section through the axially-extending flange and intersecting one of the plurality of deformations includes a stepped geometry. The plurality of deformations allows a load ring to squeeze into the plurality of deformations to increase a surface area contact between the seal ring and the load ring.

An assembly is provided for rotational equipment. This assembly includes a stationary structure, a rotating structure rotatable about an axial centerline, and a non-contact seal assembly. The non-contact seal assembly is configured to substantially seal a gap between the stationary structure and the rotating structure. The non-contact seal assembly includes a seal shoe configured to sealingly engage the rotating structure axially along the axial centerline.

A casing for a rotating machine includes a first fixed segment, and a second segment rotating along an axis of rotation (X-X). The first segment and the second segment are in contact along an interface provided with a sealing element. The sealing element is positioned in a housing connected to the internal volume of the casing, and also to the surrounding medium. The connection between the housing and the surrounding medium is made via a duct. The first casing segment or the second casing segment has a planer positioned at an outer end of the duct.

A device for adjusting and compensating working wear gaps of a floating seal ring, which is provided on a movable seat chamber, a floating seal ring and a rubber ring are provided in the movable seat chamber, the movable seat chamber and the shaft are sealed by a shaft sealing rubber ring, wherein: adjusting screw holes are provided on a center of the shaft along an axial direction, a bayonet slot for penetrating the shaft is provided on an outer side of the shaft along a radial direction, a bayonet is provided in the bayonet slot, and a locking groove is provided on an end portion of the movable seat chamber, an adjusting screw inserted into the adjusting screw hole is provided on an end portion of the shaft. The bayonet is locked into the locking groove of the movable seat chamber, so as to form an integral linkage of the bayonet, the shaft and the movable seat chamber, which are capable of rotating along the shaft. A first end of the adjusting screw is located outside the end portion of the shaft, a second end of the adjusting screw passes through the adjusting screw hole and contacts a first end of the bayonet, and a second end of the bayonet is located in the locking groove of the movable seat chamber for pushing the moving seat chamber. The working wear gaps of the floating seal ring are variable and adjustable, and random wear compensation can be performed, so the service life of the floating seal ring can be doubled.