A seal system includes a face seal rotor ring including a wide sealing face preferably made of tungsten carbide. The stator ring includes a narrower sealing face confronting the rotor ring wide sealing face. The stator ring sealing face is preferably made of polyamide-imide and tapers to narrower widths rearwardly.

A propeller shaft of a marine vessel is supported by bearing means within a stern tube or frame. The stern tube or frame has an aft end provided with a sealing assembly for sealing the propeller shaft. The sealing assembly and the stern tube or frame have at least one leakage monitor line for monitoring the condition of the sealing assembly. The at least one leakage monitor line is provided with a circumferentially extending channel section.

A sealing device for a shaft passing through a partition wall includes a housing having an opening for a shaft to pass through, and an annular groove. The sealing device also has a rigid ring arranged with axial and radial play in the annular groove of the housing and having a through-opening for the shaft to pass through, and an annular groove on an inner circumferential surface of said through-opening. The sealing device also has an elastic ring arranged in the annular groove of the rigid ring, and a sliding band for bearing against the shaft, which is arranged circumferentially on the inner circumferential surface of the through opening of the rigid ring and covers the annular groove of the rigid ring and the elastic ring arranged therein, the elastic ring being urged against the sliding band.

A sealing assembly for a stem tube implemented in a retractable thruster system and the retractable thruster system therefor. The sealing assembly comprises an annular sealing housing. The annular sealing housing comprising a first sealing layer, arranged at an opening of the annular sealing housing, configured to prevent marine growth and fluid ingress, a second sealing layer, arranged after the first sealing layer, configured to form a water-tight seal against the stem tube, a third sealing layer, arranged after the second sealing layer, configured to accommodate relative movement of the stem tube, a fourth sealing layer, arranged between the first sealing layer and the second sealing layer, configured to be inflated for providing a temporary sealing barrier; and a drainage channel, arranged between the first sealing layer and the second sealing layer, configured to provide a dedicated path for removal of fluid ingress from the annular sealing housing.

A seal ring includes an outer ring body and an inner ring body. The inner ring body is located inside the outer ring body, and the inner ring body is connected to the outer ring body; and an annular cavity is provided between the inner ring body and the outer ring body, a threaded spiral rib is provided on an inner ring surface of the inner ring body, and the threaded spiral rib extends along a length direction of a central groove of the inner ring body and a circumferential direction of the central groove.

A shaft seal includes a shaft engaging portion configured to couple to a shaft extending through a wall. The shaft seal includes a flange configured to sealingly engage the wall. The shaft seal includes a body extending between the shaft engaging portion and the flange. The seal is configured to allow radial and axial movement of the shaft relative to the wall while maintaining a seal between the flange and the wall.

A shaft seal includes a shaft engaging portion configured to couple to a shaft extending through a wall. The shaft seal includes a flange configured to sealingly engage the wall. The shaft seal includes a body extending between the shaft engaging portion and the flange. The seal is configured to allow radial and axial movement of the shaft relative to the wall while maintaining a seal between the flange and the wall.