Abstract: An oil wiper packing for a piston rod of a crosshead piston compressor, and corresponding assembly method. The oil wiper packing has at least one chamber disc having a chamber disc cutout, wherein a wiper ring arranged in the chamber disc cutout. At least two chamber discs, each having a chamber disc cutout, are arranged in succession in a direction of extent (L), and a single wiper ring is in each chamber disc cutout. Each wiper ring has no play or only negligible play in the direction of extent (L) in the operating state but is movable in the radial direction. It is necessary to set the play in in the cold state during the assembly of the wiper rings. Such an arrangement allows advantageous wiping of oil, preventing oil from spreading in the direction of extent of the piston rod.

Abstract: A segment of a seal assembly for sealing against a rotating member can include a main body extending between first and second sides and defining a radial outer surface and a radial inner surface for sealing against the rotating member, a plateau surface defining a portion of the radial inner surface, and a first transverse groove defined in the main body, the first transverse groove defining a portion of the radial inner surface and being for maintaining a pressure around portions of the segment. The segment can further include a primary pad defining a portion of the main body radial inner surface and being located at or in proximity to the first transverse groove, and can further include a secondary pad defined within the main body and located between the plateau surface and the radial outer surface, the secondary pad being radially concealed behind the plateau surface.

Abstract: A seal arrangement for use in a reciprocating piston compressor includes first and second seal rings (44,46) engaged along respective side surfaces, and first and second cover rings (40,42) disposed around the first and second seal rings (44,46) such that the outside diameters (OD5,OD6) of the first and second seal rings (44,46) engage the inside diameters (ID3,ID4) of the first and second cover rings (40,42), respectively. A support ring (36) is engaged with the first seal ring (44) and the first cover ring (40). A backup ring (38) is engaged with the second seal ring (46) and the second cover ring (42). In some embodiments, the first seal ring (44) has a width (W5) that is smaller than a width (W6) of the second seal ring (46). In other embodiments the second seal ring (146) has a circumferential groove (149) formed on an inside surface thereof, the groove (149) disposed directly adjacent the first seal ring (144).

Abstract: A piston rod seal unit. The piston rod seal unit includes a housing, a cylinder gland, and at least one floating rod seal assembly mounted in the cylinder gland, the floating rod seal assembly comprising at least one rod seal mounted onto the floating rod seal assembly.

Abstract: An exemplary turbomachine secondary ring seal assembly includes a base portion that extends circumferentially about an axis and a protrusion extending from the base portion toward the axis. The protrusion has a sealing surface that contacts a support to limit movement of a fluid from a first axial side of the base portion to a second opposite axial side of the base portion. The sealing surface faces the axis. The sealing surface may also face in a radial direction.

Abstract: A seal arrangement for sealing around a rotating shaft that passes through a ship bulkhead includes an expandible and contractible seal ring made of several seal ring segments, and radial actuators that engage the seal ring segments and can be power-activated, e.g. with a pressure medium, to pull the seal ring segments radially outwardly, thereby expanding the seal ring to a larger diameter spaced away from the shaft. When the radial actuators are not activated, the biasing force of springs contracts the seal ring segments to a smaller diameter, to establish sealing contact of the seal ring on the shaft. In normal operation a control unit activates the actuators, but if sensors detect a power failure or water in the ship, or a manual switching is triggered, then the seal arrangement contracts under spring force into the sealing condition with the seal rings sealing against the shaft.

Abstract: A segment of a seal assembly for sealing against a rotating member is disclosed. The segment includes a radial external surface, a radial internal surface for sealing against said rotating member, a face groove, and a secondary sealing surface. In embodiments, the segment may include a radial feed groove, and the face groove has an axial depth from the surface of the secondary sealing surface that is greater than the axial depth of the radial feed groove. Additionally, in embodiments, the face groove may include a relief groove, the face groove has a radial length at the axial position of the secondary sealing surface, the relief groove is axially offset from the secondary sealing surface, and the relief groove includes a portion with a radial length greater than the radial length of the face groove at the axial position of the secondary sealing surface.

Abstract: A seal arrangement for a gas turbine engine comprises a seal support having a hub portion and a peripheral rim portion. A seal member is mounted to a radially inner surface of the hub portion. A first set of circumferentially spaced-apart channel segments project from the peripheral rim portion of the seal support. A second set of circumferentially spaced-apart channel segments projects from a mating stationary structure of the gas turbine engine. The first and second sets of circumferentially spaced-apart channel segments circumferentially may be aligned to complementary form a circumferentially extending channel. A retaining ring may be mounted in the circumferentially extending channel for retaining the seal support on the mating stationary structure of the engine. The seal support may be provided with a diaphragm to provide flexibly between the seal member and the point of attachment of the seal support to the mating structure of the engine.

Abstract: A sealing structure capable of reducing oil leakage while preventing the oil from being deteriorated by a temperature rise of the oil. The sealing structure is configured to seal a clearance between two members tightly by a seal ring interposed therebetween. The seal ring is provided with a slidable structure, which is configured to seal the clearance between the two members by a hydraulic pressure applied thereto, and to unseal the clearance between the two members by a relative movement thereof resulting from a thermal expansion thereof.

Abstract: A segment of a seal assembly for sealing a higher pressure area against a rotating member is disclosed. The segment may include a radial external surface, a radial internal surface for sealing against a rotating member, a feed cavity, a ramp portion in communication with the feed cavity, a segment trough in communication with the ramp portion, one or more hydrodynamically-configured pads including an entrance; and a sealing dam disposed between the lift pad and the radial internal surface. The ramp portion may be configured to pick up air flow with an increase in velocity from the rotating member, and the trough or a flow-control portion may be configured to prevent fluid from flowing around or circumventing the pad entrance to, at least in part, provide a dynamic feed.

Abstract: A segment of a seal assembly for sealing a higher pressure area against a rotating member is disclosed. In an embodiment the segment comprises a radial external surface, a radial internal surface for sealing against a rotating member, a feed cavity, a ramp portion in communication with the feed cavity, a segment trough in communication with the ramp portion, one or more hydrodynamically-configured pads including an entrance; and a sealing dam disposed between the lift pad and the radial internal surface. In an embodiment of the segment, the ramp portion is configured to pick up air flow with an increase in velocity from said rotating member, and the trough or a flow-control portion is configured to prevent fluid from flowing around or circumventing the pad entrance to, at least in part, provide a dynamic feed.

Abstract: Aspects of the invention are directed to a sealing system for the interface between a combustor liner and transition duct. The system includes a spring clip seal. A first end of the spring clip seal operatively engages the inner peripheral surface of the transition duct. A second end of the spring clip seal is indirectly attached to the liner by an insert disposed therebetween. The spring clip seal can be attached to the insert by any kind of welding process that does not involve melting of the spring clip seal and the insert, such as fillet welding. The insert and the liner can be attached in a similar manner. Because fillet welds are relatively easy to cut, the spring clip, insert and liner can be separated without the need for cutting any of these individual components. Thus, the system can facilitate the repair, disassembly and reassembly of the interface.

Abstract: A seal for a hydraulic cylinder rod is provided. The seal includes a main body that defines an opening therein. The seal includes an inner surface and an outer surface. A first radial face having a generally planar surface extends from the inner surface to the outer surface. A second radial face having a groove disposed therein also extends from the inner surface to the outer surface. The groove defines an inner lip adjacent the inner surface and an outer lip adjacent the outer surface. The seal also includes a relief feature in the outer surface of the main body. The relief feature extends from the first radial face towards the second radial face.

Abstract: A seal assembly for co-operation with a shaft comprising a seal member which, in use, in a first position, forms a seal against the shaft, a seal housing for retaining the seal member, means for applying a radially inward force to the seal member and means for applying a radially outward force to the seal member so that, when the means for applying a radially outwards force is operated, the seal member is dilated to a second position thereby enabling the seal assembly and the shaft to be fitted and disassembled in conventional manner, when the means for applying a radially outward force is removed the means for applying a radially inward force to the seal member returns the seal member to the first position.

Abstract: A seal for a hydraulic cylinder rod is provided. The seal includes a main body that defines an opening therein. The seal includes an inner surface and an outer surface. A first radial face having a generally planar surface extends from the inner surface to the outer surface. A second radial face having a groove disposed therein also extends from the inner surface to the outer surface. The groove defines an inner lip adjacent the inner surface and an outer lip adjacent the outer surface. The seal also includes a relief feature in the outer surface of the main body. The relief feature extends from the first radial face towards the second radial face.

Abstract: A seal assembly is provided for a rotary machine wherein the rotary machine comprises a rotor and a casing. The rotor comprises a generally longitudinally-extending axis wherein the casing is generally coaxially aligned with the axis. The casing circumferentially surrounds and is radially spaced apart from the rotor wherein the casing comprises an inner circumferential channel generally coaxially aligned with the rotor. The seal assembly comprises a plurality of seal segments disposable in a circumferential array in the channel so as to be movable between radially inward and radially outward positions. In addition, the seal assembly comprises a plurality of displacement apparatuses comprising at least one fluid inlet and configured for urging apart the seal segments upon introduction of a fluid medium in the fluid inlet. Each of the seal segments comprises an end having at least one of the displacement apparatuses circumferentially disposed thereon.

Abstract: Two axially abutting individual rings (4, 5) arranged in a shared casing recess (3) at the passage (6) of a component (2) to be sealed, which each is formed of several ring segments (4′, 5′) pressed against the component (2) to be sealed by a common peripheral spring (8). The cover ring (4) facing the side (6) to be sealed is radially divided and relieved from pressure by inlet-side radial grooves (7). The actual sealing ring (5) is divided by essentially tangential sections. To reduce wear and heat transfer, the cover ring (4) exhibits a circumferential carrying shoulder (9) on the side facing the sealing ring (5), on which sits the sealing ring (5) with the circumferential peripheral surface (10) of a twist-out section (11). In addition, the pressure on the cover ring (4) is largely relieved by an inner peripheral groove (12) that is provided on the side of the carrying shoulder (9) and in contact with the delivery side (6).

Abstract: The seal is composed of butt-jointed segments (1) in which the bearing surface (18) on a rotating part (2) subject to wear, includes a hollow chamber (20) communicating through calibrated orifices (22) with a high pressure containment (8). Therefore, it fills up with gas which tends to force it away from the surface, thus reducing the contact pressure without introducing excessive leaks.

Abstract: This invention discloses a completely different hydrodynamic gas seal configuration from both the Rayleigh bearing and other prior art. Instead of the shallow, wide, and short single pocket geometry for the Rayleigh bearing, and instead of the multiple depth grooves of the other prior art teachings, the hydrodynamic seal in this invention has a sealing face with lift pockets therein that are deep (normally in the range of about 0.010 inches to about 0.025 inches deep), narrow, long, multiple, coextensive, parallel, and single-depth. This invention incorporates the same basic hydraulic principle of generating pressure rise by the shearing gradient between the rotating shaft and stationary carbon elements, and therefore produces a force which is opposite in direction to the rubbing force generated by the ambient pressure drop across the seal. In this invention the forces are more evenly balanced across the axial face of the seal ring segments, thereby accommodating any conicity of the shaft race.

Abstract: A hydrodynamically lubricated interference type rotary shaft seal suitable for environmental exclusion and high pressure lubricant retention which incorporates composite multiple modulus construction and a non-planar flexible environmental edge heel geometry which cooperate to resist high pressure extrusion damage while minimizing interfacial contact pressure and accommodating radial shaft motion.

Abstract: A hydrodynamically lubricated interference type rotary shaft seal suitable for environmental exclusion and high pressure lubricant retention which incorporates composite multiple modulus construction and a non-planar flexible environmental edge heel geometry which cooperate to resist high pressure extrusion damage while minimizing interfacial contact pressure and accommodating radial shaft motion.