The invention relates to a marine meachanical seal arrangement comprising a first mechanical seal (2) comprising a first rotating slide ring (21) and a second stationary slide ring (22) defining a first sealing gap (23) between their two sliding surfaces (21a, 22a), a second meachanical seal (3) comprising a second rotating slide ring (31) and a second stationary slide ring (32), which define a second sealing gap (33) between their sliding surfaces (31a, 32a), a barrier circuit (10) comprising a barrier fluid cavity (8) which is arranged between the first mechanical seal (2) and the second mechanical seal (3) and is filled with a barrier fluid, the barrier fluid cavity (8) being divided into a first sub-cavity (81) and a second sub-cavity (82), the first subcavity (81) and the second subcavity (82) being separated by a flexible lip seal (7) wherein the second sub-cavity (82) is arranged at the second mechanical seal (3), and wherein the lip seal (7) is arranged such that a flow of barrier fluid from the first subcavity (81) into the second subcavity (82) is allowed and a flow of barrier fluid from the second subcavity to the first subcavity is prevented. (FIG. 2)

An open cooling space or spiral cooling channel is formed between channel walls of a spool and an outer housing of a rotating shaft seal. The spool is sealed to the housing at the two ends thereof, does not intrude into the cooling inlet or outlet, and is axially removable and exchangeable without being distorted, thereby avoiding damage to the spool and/or contact between the spool and rotating seal elements. Due to the easy installation and removal of the spool, it can be installed as an upgrade after seal installation, and is easily cleaned and replaced. The cooling channel can be terminated by inlet and outlet rings, such that the spool does not require any rotational alignment within the seal assembly. The cooling channel can have a square or rectangular cross-section, thereby increasing thermal exchange between the cooling channel and the cooling channel spool rendering the cooling more efficient.

A dry gas mechanical seal system configured to inhibit the emission of process gas. The mechanical seal system having tandem first and second stage seals, and a single separation gas supply subsystem configured to direct a supply of separation gas from an inlet through interfacing portions of the first stage seal into a process cavity and from the inlet through the interfacing portions of the second stage seal and out through an outlet to the atmosphere, thereby inhibiting the emission of process gas between a compressor housing and a rotating compressor shaft.

A mechanical seal includes rotating seal ring which rotate with a rotary shaft, stationary seal rings, and an adaptor which holds the stationary seal rings, the adaptor being fixed to a seal cover by bolts. The mechanical seal further includes a plurality of holders brought into contact with the adapter and provided with through holes. A body part of each of the bolts passes through each of the through holes and is screwed into each of threaded holes formed in the seal cover. The plurality of holders being arranged so as to surround the rotary shaft.

A mechanical seal assembly adapted for arrangement around a rotating shaft of a pump has first and second seals. Both include primary and mating rings, biasing mechanisms and annular flexible sealing membranes. The two seals can have different seal balances or different biasing forces (or both) to allow the second seal to run dry for extended periods.

A mechanical seal includes rotating seal ring which rotate with a rotary shaft, stationary seal rings, and an adaptor which holds the stationary seal rings 30, the adaptor 5 being fixed to a seal cover by bolts. The mechanical seal further includes a plurality of holders brought into contact with the adapter and provided with through holes. A body part of each of the bolts passes through each of the through holes and is screwed into each of threaded holes formed in the seal cover. The plurality of holders 9 being arranged so as to surround the rotary shaft.

A seal that can be used alone or as a containment seal for another seal includes a primary ring (36) and a mating ring (30), the primary ring being axially shiftable relative to a rotating shaft (12) and the mating ring being axially fixable relative to the rotating shaft, a biasing mechanism (500) that urges the primary ring toward the mating ring, and an annular flexible sealing membrane (100). The membrane includes a flange portion (102) disposed at least partially between the biasing mechanism and the primary ring, a coaxial portion (104) that is axially fixable relative to the shaft, and a flexible connection portion (106) positioned within a radially inward extent of the flange portion and connecting the flange portion to the coaxial portion. At least one of the mating ring and the primary ring includes grooves formed on a face thereof that cause the formation of a gas film to develop between the primary ring and the mating ring that keeps the primary ring and the mating ring from contacting each other in operation.

The invention relates to a mechanical seal arrangement comprising a first mechanical seal (2) having a first rotating sliding ring (22) and a first stationary sliding ring (21) defining a first sealing gap (20) therebetween, a second mechanical seal (3) having a second rotating sliding ring (22) and a second stationary sliding ring (32) defining a second sealing gap (30) therebetween, a housing (4) having an inlet (40) and an outlet (41) for a cooling liquid, a rotating conveying sleeve (5) joined to the first rotating sliding ring (22) and the second rotating sliding ring (32), the conveying sleeve (5) having a plurality of conveying grooves (50) on its outer circumference wherein the first stationary sliding ring (21) is arranged radially outside the conveying sleeve (5) and has an inner circumference (21a) which is arranged eccentrically with respect to an outer circumference (50a) of the conveying sleeve (5) so that a circumferential eccentric gap (6) is formed between the outer circumference (50a) of the conveying sleeve (5) and the inner circumference (21a) of the first stationary sliding ring (21) and wherein the first stationary sliding ring (21), on a rear side (21b) facing away from the first sealing gap (20), has a first slot (9) directed towards the outlet (41) and a first widening recess (11) on the inner circumference (21a), which recess opens into the first slot (9).

A rotary machine includes a plurality of shafts that extend in an axial direction, in which an axis extends, around the axis, are disposed such that at least parts of positions in the axial direction of the plurality of shafts overlap each other, and are rotatable relative to each other around the axis; a plurality of seal members that are disposed at intervals in the axial direction to seal gaps between the plurality of shafts in a radial direction with respect to the axis; and a seal gas supply unit configured to supply a seal gas from outside to a space surrounded by the plurality of shafts and the plurality of seal members.

Provided is a cartridge axial double-end-face split type mechanical seal, including: a shaft sleeve, a gland, a medium rotary ring, a medium stationary ring, an atmospheric rotary ring, and an atmospheric stationary ring which are all center-split, wherein the shaft sleeve is sleeved on a main shaft, a medium rotary ring groove is disposed at the bottom of the shaft sleeve, the medium rotary ring is fixed in the medium rotary ring groove, the medium stationary ring is sealingly connected with the medium rotary ring, and a first push ring is disposed at the top of the medium stationary ring; an atmospheric rotary ring groove is disposed at the top of the shaft sleeve, the atmospheric rotary ring is fixed in the atmospheric rotary ring groove, the atmospheric stationary ring is sealingly connected with the atmospheric rotary ring.