A mechanical seal includes: a mating ring; a seal ring; a casing which includes a pop-out regulation portion supporting the seal ring not to be rotatable and to be axially movable and coming into contact with the seal ring to regulate the seal ring from popping out toward the mating ring; an urging member disposed between the seal ring and a back wall of the casing axially overlapping with the seal ring and axially urges the seal ring toward the mating ring; and an annular secondary seal sealing a gap between the casing and the seal ring. The casing includes a regulation wall which regulates the secondary seal from moving toward the side opposite to the mating ring and an axial dimension between the seal ring and the regulation wall is equal to or less than a half of an axial dimension of the secondary seal while the seal ring and the pop-out regulation portion are in contact with each other.

The invention relates to a mechanical seal assembly comprising a mechanical seal (2) with a rotating slide ring (3) and a stationary slide ring (4) defining a seal gap (5) therebetween, a pretensioning device (6) which biases the stationary slide ring (4) in the axial direction (X-X) of the slide ring seal arrangement, a support ring (7) which is arranged on the stationary slide ring (4), the support ring (7) being axially movable relative to the stationary slide ring (4) the pretensioning device (6) being arranged between the support ring (7) and the stationary slide ring, a fixing device (8) which is arranged for axially movable fixing the support ring (7) to a stationary component, a stop (9) which limits a distance (W1) by which the axially movable support ring (7) can be moved, and a secondary seal (10) which is arranged to seal between the support ring (7) and the stationary component.

The rotary face seal with magnet loading replaces known spring mechanisms with magnetic technology that provides a consistent load with minimal variation, which is not affected by natural frequency and material fatigue due to cyclic loading. This improves seal performance and service life. The tubular magnetic ring is advantageous because it replaces existing seals within stationary cartridge with a puller type magnetic assembly design that results with the stationary cartridges being an exact exchange. The use of magnetic technology attached to the outside diameter of the rotating mating ring, which is attached to the shaft, that does not produce eddy currents because it is of a single pole configuration. The single pole magnetic assembly design is achieved by either axial or radial magnet orientation, such as in the form of a tubular magnetic band locating in a circumferential notch in the rotating mating ring.

A seal assembly for sealing an annular space between a first cylindrical surface and a second cylindrical surface. The annular space has high pressure zones and low pressure zones. The seal assembly has an annular seal with an inner surface that faces the second cylindrical component, an outer surface that faces the first cylindrical component, a sealing end and an engagement end. A seal actuator assembly applies a force to the engagement end of the annular seal to urge the annular seal in a first direction towards an engaged position within the annular space. The force applied to the engagement end of the annular seal has a first component aligned with the first direction and a second component that is perpendicular to the first direction. The first component is at least 1.7 times greater than the second component.

A rotary tube kiln, with a rotatably mounted rotary tube, which has a motorized drive, a mounting, a material inlet and a material outlet, wherein the interior space of the rotary tube has a process space, the inside atmosphere of which is separate from the outside atmosphere. The process space is sealed off from a pressure space by means of a first seal and the pressure space is sealed off from the outside atmosphere by means of a second seal and, by means of a pressing device, a first pressing force can be applied to the first seal and a second pressing force can be applied to the second seal, the first pressing force can be set independently of the second pressing force and, during operation, the internal pressure of the pressure space is higher than the internal pressure of the process space.

A mechanical seal having a first seal ring, which is mounted in a receptacle of a fixed part, and a second seal ring, which is mounted in a sleeve of a rotary part having a fixing portion fixed to a rotary shaft. The second seal ring extends radially inwards relative to the fixing portion of the sleeve, above an upper ending surface of the rotary shaft. The first seal ring is disposed above the second seal ring in such a way that the sliding surfaces of the first seal ring and of the second seal ring are in mutual contact. The sliding surfaces of the first seal ring and of the second seal ring have a mean diameter that is lower than an external diameter of the rotary shaft.

The invention relates to a mechanical seal arrangement comprising a mechanical seal (2) having a rotating sliding ring (3) and a stationary sliding ring (4) defining a sealing gap (5) between the sealing surfaces (30, 40) thereof, a slide ring carrier (6) for holding the stationary sliding ring (4), an axially movable thrust ring (7) arranged on a rear side (43) of the stationary sliding ring (4) between the slide ring carrier (6) and the stationary sliding ring, a pretensioning device (8) arranged between the thrust ring (7) and the slide ring carrier (6) to pretension the stationary sliding ring (4) in the axial direction X-X of the mechanical seal arrangement, and an anti-rotation device (10) to keep the stationary sliding ring (4) rotationally fixed and axially movable, the anti-rotation device (10) having a first transmission device (11) for transmitting force between the sliding ring carrier (6) and the thrust ring (7) and a second transmission device (12) for transmitting force between the thrust ring (7) and the stationary sliding ring (4), and wherein a locking element (13) is arranged on the first transmission device (11) to secure the thrust ring (7) against axial disengagement.

A sealing system includes a housing defining a bore having an internal surface. A rotatable shaft is rotatably disposed in the bore and includes an annular groove disposed in an exterior surface of the rotatable shaft. The annular groove includes a groove bottom and a pair of lateral sidewalls. A seal is formed as a cylindrical annular thermoplastic body having an axial length greater than an axial length of the annular groove and which is bent into a V-shaped cross-section and received in the annular groove so that opposite ends of the seal are disposed in opposite bottom corners of the annular groove. A peak portion of the V-shaped cross section extends radially outward of the annular groove and is engaged with the internal surface of the bore.

The purpose of the present invention is to provide a mechanical seal whose axial dimension can be reduced without impairing sealing performance. In a mechanical seal including a rotating-side sealing ring 11; a stationary-side sealing ring 21 provided within a case 22 and sliding on the rotating-side sealing ring 11; a biasing member 24 for biasing the stationary-side sealing ring 21 to the rotating-side sealing ring 11; and an engagement means 25 for restricting the rotational relative movement between the case 22 and the stationary-side sealing ring 21, the biasing member 24 is arranged radially outside the stationary-side sealing ring 21.

A two-position handpiece coupling seal is provided. The two-position handpiece coupling seal includes a neck disposed at a first end that is configured to receive an implement. The two-position handpiece coupling seal has a first seal disposed about the neck of the two-position handpiece coupling seal. The first seal is configured to engage with a surface of a housing of a handpiece that uses the two-position coupling seal in a first position. The two-position handpiece coupling seal has a second seal disposed about a bore of the two-position handpiece coupling seal at a second end of the two-position handpiece coupling seal opposite the first end. The bore is configured to receive a driveshaft and the second seal is configured to sealingly engage with the driveshaft when the bore receives the driveshaft.