A seal assembly for sealing a grease lubricated large rolling-element bearing includes a radial shaft seal having at least one seal lip configured to sealingly abut against a shaft to seal a bearing interior and substantially prevent a grease discharge from the bearing and a grease flow regulation device, such as an annular pumping ring, for regulating a grease pressure at the at least one seal lip, the grease flow regulation device being mounted adjacent to the radial shaft seal at a side of the radial shaft seal that is intended to face the bearing interior in an installed state.

A seal assembly for sealing a grease lubricated large rolling-element bearing includes a radial shaft seal having at least one seal lip configured to sealingly abut against a shaft to seal a bearing interior and substantially prevent a grease discharge from the bearing and a grease flow regulation device, such as an annular pumping ring, for regulating a grease pressure at the at least one seal lip, the grease flow regulation device being mounted adjacent to the radial shaft seal at a side of the radial shaft seal that is intended to face the bearing interior in an installed state.

A mechanical seal device for a centrifugal separator includes a first seal ring including a first seal surface and a second seal ring including a second seal surface. The first and second seal surfaces are configured to face each other to form a seal, and at least one channel for a cooling fluid is arranged in the first seal ring. The at least one channel includes an inlet and an outlet. The outlet of the at least one channel is arranged at the first seal surface of the first seal ring. A centrifugal separator includes the mechanical seal device.

A mechanical seal device for a centrifugal separator includes a first seal ring including a first seal surface and a second seal ring including a second seal surface. The first and second seal surfaces are configured to face each other to form a seal, and at least one channel for a cooling fluid is arranged in the first seal ring. The at least one channel includes an inlet and an outlet. The outlet of the at least one channel is arranged at the first seal surface of the first seal ring. A centrifugal separator includes the mechanical seal device.

Provided is a seal ring configured so that stable lubrication performance can be provided across a wide range of rotation speed. A seal ring for sealing a clearance between a rotary shaft and a housing includes inclined grooves formed at a sliding surface so as to be arranged in a circumferential direction, the inclined grooves being open on an outer diameter side of the seal ring to generate a drawing pressure. The seal ring further includes supply grooves being open on a sealed fluid side of the seal ring and extending in a radially outward direction toward inner diameter sides of the inclined grooves.

Provided is a seal ring configured so that stable lubrication performance can be provided across a wide range of rotation speed. A seal ring for sealing a clearance between a rotary shaft and a housing includes inclined grooves formed at a sliding surface so as to be arranged in a circumferential direction, the inclined grooves being open on an outer diameter side of the seal ring to generate a drawing pressure. The seal ring further includes supply grooves being open on a sealed fluid side of the seal ring and extending in a radially outward direction toward inner diameter sides of the inclined grooves.

A dry running mechanical seal is able to form a direct contact seal for extended periods at both low and high rotational speeds without undue heating or wear of the seal faces. A rear surface of the stator face and corresponding surface of a mounting plate are both lapped for maximum direct contact transfer of heat. Air from a region surrounding the shaft is circulated through a cooling annulus directly behind the stator face and out through exit ports. In embodiments, enlarged scallops or other features on the rotor seal face enhance air turbulence near the seal faces. In various embodiments a surface supporting a dynamic gasket is polished smooth, thereby reducing gasket drag, minimizing the required pressing force between the seal faces, and reducing frictional heating. In embodiments, the rotor seal face shape is optimized to minimize pressure distortions at high pressure.

A dry running mechanical seal is able to form a direct contact seal for extended periods at both low and high rotational speeds without undue heating or wear of the seal faces. A rear surface of the stator face and corresponding surface of a mounting plate are both lapped for maximum direct contact transfer of heat. Air from a region surrounding the shaft is circulated through a cooling annulus directly behind the stator face and out through exit ports. In embodiments, enlarged scallops or other features on the rotor seal face enhance air turbulence near the seal faces. In various embodiments a surface supporting a dynamic gasket is polished smooth, thereby reducing gasket drag, minimizing the required pressing force between the seal faces, and reducing frictional heating. In embodiments, the rotor seal face shape is optimized to minimize pressure distortions at high pressure.

A rod guide includes a housing portion and a depressed portion formed toward an outer periphery from a starting point located apart from a piston rod by ½ or more of a distance in an axial direction between a bottom surface of the housing portion and a flat portion of an oil seal in a radial direction closest to the piston rod, and a bush is disposed to be flush with the bottom surface or disposed to project.

A noncontacting intershaft seal system includes force generating mechanisms to reduce contact related effects. A sealing system includes an outer shaft that has a hollow interior. An inner shaft extends through the hollow interior of the outer shaft. Spaced apart end plates encircle and rotate with the inner shaft. A gland opening is defined between the inner and outer shafts and between the end plates. A ring is disposed in the gland opening. The end plates and/or the ring include force generating elements that generate force to separate the ring from the end plates, reducing contact related heat generation and wear.