Abstract: A centrifugal compressor, including: a housing; a motor assembly disposed in the housing and a motor cavity and a motor shaft located in the motor cavity, the motor shaft having a first end and a second end extending from the motor cavity; a first impeller assembly located at the first end of the motor shaft and provided with a first labyrinth sealing mechanism; a second impeller assembly located at the second end of the motor shaft and provided with a second labyrinth sealing mechanism; a first gas bearing assembly provided between the motor cavity and the first impeller assembly; and a second gas bearing assembly provided between the motor cavity and the second impeller assembly; wherein the first labyrinth sealing mechanism is kept in gas communication with the first gas bearing assembly, and the second labyrinth sealing mechanism is kept in gas communication with the second gas bearing assembly.

Abstract: A gas turbine engine according to an exemplary aspect of the present disclosure includes, among other things, a bearing compartment, a seal runner, a seal configured to cooperate with the seal runner to seal the bearing compartment, and a catcher in contact with the seal runner to minimize deflection of the seal runner. A method is also disclosed.

Abstract: A valve packing having independently loaded packing rings is disclosed. A packing assembly for a fluid valve includes a first packing ring, a first follower to be disposed at least partially within a bore of a bonnet of the fluid valve to apply a first load to the first packing ring, a second packing ring sized to fit within a bore of the first follower, and a second follower to be disposed at least partially within the bore of the first follower to apply a second load to the second packing ring within the bore of the first follower.

Abstract: 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.

Abstract: Provided are a ball joint and a dust cover that make it possible to suppress contact of a body portion of the dust cover with the vicinity of a flange portion of a ball stud. A dust cover integrally includes: a deformable bellows-shaped body portion made of an elastic body; a fixed portion made of an elastic body and provided on one end side of the body portion; and a sealing portion made of an elastic body and provided on the other end side of the body portion. The sealing portion includes: an inner peripheral sealing portion configured to be slidable on a part of a shank portion on the opposite side of the shank portion from a spherical portion with respect to a flange portion; and a cover portion that continuously covers, in an outer wall surface of the flange portion, a radially outward tip end portion and a part of a portion that decreases in diameter from the tip end portion toward the spherical portion side.

Abstract: A Stirling cycle machine with a liquid fuel/gaseous fuel burner. The burner may include a preheater to capture the thermal energy of the exhaust. The burner directs the preheated air to each burner head, where it enters a prechamber. Each burner head includes a fuel nozzle that directs liquid or gaseous fuel into the prechamber. The prechamber is fluidically connected to a combustion chamber via a prechamber nozzle that has a smaller opening than the prechamber. The burner head ignites the fuel air mixture in the prechamber with an ignitor located above or within the prechamber. The flame is initially lit as a diffusion flame in the prechamber. The flame is pushed out of the prechamber into the combustion chamber by an increased air flow rate. The liquid fuel from the nozzle now evaporates in the prechamber and forms a prevaporized flame in the combustion chamber.

Abstract: A gas turbine engine according to an exemplary aspect of the present disclosure includes, among other things, a bearing compartment, a seal runner, a seal configured to cooperate with the seal runner to seal the bearing compartment, and a catcher in contact with the seal runner to minimize deflection of the seal runner. A method is also disclosed.

Abstract: Provided is a seal member or a ball joint capable of satisfactorily maintaining sealing performance between a ball portion of a ball shank and a ball receiving portion of a holder for a long time even when the ball shank is used under a condition that the ball shank is pivoted repeatedly with respect to the holder at a large pivot angle and at high speed. The seal member includes: a base portion having an annular ring shape and is to be fixed to the holder; a retaining portion formed on an inner peripheral side of the base portion integrally with the base portion and is recessed into a conical shape toward the holder; and a lip portion formed along an inner peripheral edge of the retaining portion so as to be held in sliding contact with a spherical surface of the ball portion of the ball shank.

Abstract: An axle seal is provided and includes a seal element having a seal element top, a seal element bottom, a seal element mounting lip which extends downwardly from the seal element bottom, and a seal element sleeve, wherein the seal element sleeve is securely and sealingly associated with the seal element mounting lip, and wherein the seal element includes, a first surface having a first edge, and a second surface having a second edge, wherein the first surface and second surface extend circumferentially away from the seal element, and wherein the first surface and second surface are separated from each other to form an edge channel which extends circumferentially around the seal element.

Abstract: A master cylinder of a brake for a vehicle may include: a housing having a port through which oil is transferred; a motor connected to the housing so as to supply rotary power; a screw rotatably installed in the motor, and rotated by the rotary power received from the motor; a moving piston engaged with the outside of the screw, and moved in the longitudinal direction of the housing by the rotation of the screw; and a fixed piston fixed to the inside of the housing, and having the moving piston positioned on the outside thereof.

Abstract: A self-aligning stuffing box is provided for mounting to a wellhead and aligning with a polished rod extending therethrough. The stuffing box has an upper sealing section housing stuffing box seals and an annular retaining plate for clamping a flange portion of the sealing section to the wellhead. The flanged portion of the sealing section has oversized bolt apertures, allowing it to be laterally displaced relative to the wellhead before being secured to the wellhead. The retaining plate and the wellhead have bolt apertures corresponding to the oversized apertures. The stuffing box can be mounted on a wellhead using a plurality of fasteners. The stuffing box can be aligned with a polished rod by loosening the fasteners and stroking the polished rod to allow the sealing section to be laterally displaced. The fasteners can then be tightened or re-tightened to secure the sealing section to the wellhead.

Abstract: A low drag fluid seal. The fluid seal includes a rigid lip separated from the rotor shaft by a gap, the gap being sufficient narrow, radially, to prevent liquid from seeping through the gap at an unacceptable rate, but sufficiently wide, radially, to avoid unacceptably high viscous drag. Fluid that seeps through the gap accumulates in a recovery cavity and is recovered by a scavenge pump.

Abstract: A gaiter (4) for a lubricated joint (1) comprises a sidewall structure (9) defining an enclosure (5) for receiving a lubricant and a passageway (24) for conveying a gas. In use, the passageway (12) conveys gas in isolation from said enclosure (5). Gaiters (4) in accordance with the invention find application in vehicle central tire inflation systems (CTIS).

Abstract: An aerodynamic seal assembly for a rotary machine includes multiple sealing segments disposed circumferentially intermediate to a stationary housing and a rotor. Each of the segments includes a shoe plate with a forward load-bearing section and an aft load-bearing section configured to generate an aerodynamic force between the shoe plate and the rotor. The shoe plate includes at least one labyrinth teeth facing the rotor and positioned between the forward load-bearing section and the aft load-bearing section. The sealing segment also includes at least one spring connected to a pedestal located about midway of an axial length of the shoe plate and to a stator interface element. Further, the sealing segment includes a rigid segmented secondary seal attached to the stator interface element at one first end and in contact with the pedestal of the shoe plate at one second end.

Abstract: A seal assembly for a rotary machine is provided. The seal assembly includes multiple sealing device segments disposed circumferentially intermediate to a stationary housing and a rotor. Each of the sealing device segments includes a stator interface element, a shoe plate having an extended portion having one or more labyrinth teeth facing the rotor and a load bearing portion, wherein the shoe plate is configured to generate an aerodynamic force between the shoe plate and the rotor. The sealing device segment further includes a secondary seal configured to be in contact with the stator interface element at a radially outer end and configured to be in contact with an elevated nose section of the extended portion of the shoe plate on a radially inner end; and multiple flexible elements attached to the shoe plate and to the stator interface element.

Abstract: A seal assembly for a rotary machine is provided. The seal assembly includes multiple sealing device segments disposed circumferentially intermediate to a stationary housing and a rotor. Each of the sealing device segments includes a stator interface element. The sealing device segment also includes a shoe plate having one or more labyrinth teeth facing the rotor and a load-bearing surface region, wherein the shoe plate allows a high pressure fluid to an upstream portion of the forwardmost labyrinth tooth and a low pressure fluid to a downstream portion of the aftmost labyrinth tooth. The sealing device segment further includes a secondary seal in contact with the stator interface element at a radially outer end and in contact with an elevated nose of the shoe plate on a radially inner end; and multiple bellow springs or flexures attached to the shoe plate and to the stator interface element.

Abstract: A composition for a gasket, including about 100 parts by weight of a hydrogenated styrene-based block copolymer, about 70 to 99 parts by weight of a petroleum-based softener, about 10 to 25 parts by weight of a polyolefin-based resin; about 10 to 25 parts by weight of an inorganic filler, and about 10 to 25 parts by weight of a heat-resistant polymer, based on 100 parts by weight of the hydrogenated styrene-based block copolymer. The thermoplastic elastomer composition has superior physical properties, such as tensile strength, heat resistance, high-temperature restoring force and chemical resistance, while being applicable to injection-molding and recyclable, like general thermoplastic resins.

Abstract: Disclosed herein is a composition for a gasket, including about 100 parts by weight of a hydrogenated styrene-based block copolymer, about 70 to 99 parts by weight of a petroleum-based softener, about 10 to 25 parts by weight of a polyolefin-based resin; about 10 to 25 parts by weight of an inorganic filler, and about 10 to 25 parts by weight of a heat-resistant polymer, based on 100 parts by weight of the hydrogenated styrene-based block copolymer. The thermoplastic elastomer composition has superior physical properties, such as tensile strength, heat resistance, high-temperature restoring force and chemical resistance, while being applicable to injection-molding and recyclable, like general thermoplastic resins. Disclosed herein is further a gasket produced from the composition.

Abstract: A gyratory crusher including a crusher head on which a first crushing shell is mounted, a frame on which a second crushing shell is mounted, the first and second crushing shells forming a crushing aperture. A drive device is adapted to rotate an eccentric to which the crusher head is so connected as to be caused, during rotation of the eccentric, to perform a gyratory movement for crushing of material which is introduced into the crushing aperture. A dust seal is adapted to seal a gap between the frame and a fastening portion situated close to the crusher head. The dust seal includes a seal bellows and a seal slide ring. The seal slide ring is connected sealingly to a lower portion of the seal bellows and has a lower slide surface adapted to slide along, and to sealingly abut, with a substantially vertical abutment pressure determined by the inherent weight of the seal slide ring and by the influence of the seal bellows, against an upper slide surface provided on the frame.

Abstract: A front cover of a manual rotary pump includes a disk having a cavity eccentrically defined therein for airtightly receiving an oil seal. A through hole is defined in a bottom of the cavity to allow an input shaft of a rotor extending through the disk. The oil seal is airtightly sleeved on the input shaft for forming an airtight condition between the input shaft and the disk. The disk has at least two bores defined therein and longitudinally communicating with the cavity for operator to easily detach and replace the oil seal by using a tool extending through the at least two bores. A diameter of the through hole in the disk is slightly greater than that of the input shaft and the diameter difference between the through hole and the input shaft is ranged from 0.05 mm to 0.2 mm.

Abstract: A progressing cavity pump or a motor includes, in one embodiment, an outer tube 12, an inner tube 14, and a plurality of apertures 16. A pair of annular seal glands 18 seal the stator material to the outer tube. The stator material is injection molded into the inner tube and passes through the plurality of apertures and into an annular gap between the inner tube and the outer tube. In other embodiments, the outer housing for a progressing cavity pump or motor is provided with one or more grooves, with each groove having an outer surface radius less than the outer housing surface radius. A plurality of apertures are provided in fluid communication with the grooves. According to the method of the invention, the stator material is injected into the apertures and fills a space radially outward of the apertures to bond the stator materiaal to the outer housing.

Abstract: A diffuser saddle connection is used for the attachment of diffusers on submerged air laterals in systems that treat municipal and industrial waste water. A top saddle surface and a bottom saddle surface enclose a portion of a feed pipe. A spout attached to the bottom saddle surface is solvent-welded to a tee, which is threadedly engaged to a diffuser. Flexible bushings on a nipple attached to the tee relieve stress on the connection between the diffuser and the diffuser saddle connection. An open end allows water to flow into the diffuser pipe to provide hydrostatic equilibrium and to reduce buoyancy.

Abstract: A sealing arrangement for closing off an end of a chamber formed between a plurality of rollers of a pressing apparatus, comprises a seal member made of a hard seal material such as carbon fiber material. The sealing arrangement is preferably a self-loaded sealing arrangement.

Abstract: A circumferential seal for sealing between a rotating shaft and a stationary housing circumscribing the shaft. The seal comprises a stator mounted to said housing and having a radially inward facing carbon portion and a rotor with a ceramic sealing member having a radially outward facing surface in rubbing contact with said carbon portion. The rotor also includes a metal clamping means for mounting the ceramic sealing member to the shaft. The clamping means includes an axial flexible clamping member, and a radial flexible clamping member that together clamp onto a mounting flange of the ceramic sealing member when exposed to the compressive force of a lockup assembly.

Abstract: A sealing device for explosion-proof motors, the particularity of which is the fact that it comprises a first element which is coupled to the motor casing and a second element which is coupled to the driving shaft through rolling means; the first and second elements are mutually coupled through elastic elements to allow their relative movement.