A wear ring for a piston of a die-casting apparatus comprises an annular body having a gap extending therethrough. The gap is configured to define at least two circumferentially offset pairs of circumferentially spaced apart facing surfaces. The facing surfaces of each pair are angled and configured to contact each other in a flush manner when the wear ring is circumferentially compressed.

A hydraulic actuator comprises a metal helical coiled multilayer seal (8, 12) for sealing between two relatively moving parts. The hydraulic actuator may include a hydraulic cylinder assembly in which the metal helical coiled multilayer seal is configured for piston sealing and piston rod sealing. The hydraulic actuator may also include a spool type hydraulic control valve in which the metal helical coiled multilayer seal is configured for spool sealing. The present invention overcomes the temperature limitation and pressure limitation and allows the removal of all of the rubber O-rings in hydraulic actuators in conventional art.

Die Erfindung betrifft eine Anordnung zum Abdichten einer sich bezüglich einer Durchtrittsöffnung im Wesentlichen geradlinig hin und her bewegenden Kolbenstange (105) einer Hubkolbenmaschine (100) aufweisend die Kolbenstange (105) umgebende Dichtmittel (8a, 8b, 8c, 8d) nach Art eines innenspannenden Dichtungsrings (8a, 8b, 8c, 8d), der im Bereich der Durchtrittsöffnung bezüglich eines Dichtungsgehäuses (4, 5) im Wesentlichen ortsfest angeordnet ist, wobei zumindest zwei Dichtungsringe (8a, 8b) vorgesehen sind, die in einer Radialrichtung (3b) beweglich, insbesondere schwimmend im Dichtungsgehäuse (4, 5) gelagert sind und sich zwischen zumindest zwei Dichtungsringen (8a, 8b, 8c, 8d) eine Abstandshaltereinrichtung (9a, 9b, 9c) angeordnet ist, die radial außenseitig im Dichtungsgehäuse (4, 5) spielfrei oder mit geringem Spiel geführt ist und radial innenseitig zur Kolbenstange (105) ein radial größeres Spiel aufweist und zusammen mit den Dichtungsringen (8a, 8b, 8c, 8d) und der Kolbenstange (105) eine Staukammer (10a, 10b, 10c) für abzudichtendes Medium, z. B. für Öl, bildend die Kolbenstange (105) nicht berührt, insbesondere beabstandet von der Kolbenstange (105) angeordnet ist und der Abstandshalterring (9a, 9b, 9c) zumindest einen Durchgang (14) zum Ableiten von Medium aus der Staukammer (10a, 10b, 10c) heraus aufweist.

Um einen Packungsring (14) anzugeben, der möglichst einfach und kompakt aufgebaut ist, eine höhere Lebensdauer ermöglicht und flexibel an unterschiedliche Einsatzbedingungen angepasst werden kann, ist erfindungsgemäß vorgesehen, dass an zumindest einem Ringsegment (14a) zumindest eine Verschleißöffnung (27) vorgesehen ist, die sich von einer radial außenliegenden Außenumfangsfläche (23) und/oder dem zweiten axialen Ringende (RE2) des Ringsegments (14a) in Richtung einer radial innenliegenden Innenumfangsfläche (18) des Ringsegments (14a) erstreckt, wobei das Verschleißöffnungsende (27a) der zumindest einen Verschleißöffnung (27) in einem Abstand in radialer Richtung des Ringsegments (14a) von der radial innenliegenden Innenumfangsfläche (18) des Ringsegments (14a) beabstandet ist, der höchstens 40% einer, sich zwischen der außenliegenden Außenumfangsfläche (23) und der radial innenliegenden Innenumfangsfläche (18) des Ringsegments (14a) erstreckenden radialen Ringhöhe (RH) beträgt, wobei das Verschleißöffnungsende (27a) zwischen dem ersten und dem zweiten axialen Ringende (RE1, RE2) liegt und vom ersten und zweiten axialen Ringende (RE1, RE2) beabstandet ist.

A seal including a first metal component; a second metal component couplable with the first metal component; and a shape memory alloy having a first state and a second state, the first state and the second state being different in at least one dimension, wherein in response to an external stimulus, the shape memory alloy transitions in one or more dimension from the first state to the second state thereby forming at least one metal-to-metal seal.

軸封装置の組み付け性が良好であり、軸封装置から圧縮ガスの漏洩を低減することができる、オイルフリースクリュ圧縮機を提供する。互いに噛み合う雄雌一対のスクリュロータ（１６）を圧縮機のケーシング（１２）のロータ室（１５）内に収容し、ロータ軸（２１）を介してスクリュロータを軸受（２２）で支持し、ロータ室と軸受との間に形成されるケーシングの軸封空間（１０）に配設され、ロータ軸をシールする軸封装置（３０，４０）を有するオイルフリースクリュ圧縮機（１）において、軸封装置は、軸受側に配置されるオイルシール（３１）と、ロータ室側に配置されるパッキンケース（４１）と、ガスをシールするためのガスシール（４２）と、を備え、パッキンケースの軸受側の端部（４４）とオイルシールのロータ室側の端部（３３）とが締まりばめによって嵌合固定されることによって形成されたガスシール収容空間（４８）に、シールリングが収容される。

Sealing assemblies to provide sealing between a shaft and a housing comprising a sealing component comprising a body section as well as an outer flange and an inner flange both extending from said body section; a supporting component receiving said sealing component and comprising a relatively thick inner arm projecting into said sealing component and providing a supporting area spanning an inner portion of said body section and a portion of said inner flange; an anti-extrusion component engaged with said relatively thick inner arm; the minimum clearance between said anti-extrusion component and said shaft being less than the minimum clearance between said relatively thick inner arm and said shaft; said inner flange comprising a sealing area; wherein said sealing assembly is to be received in a cavity in said housing or on said shaft.

A method of manufacturing a packing cup for a hyper-compressor is described. The method comprises the following steps: providing an inner disc (25), having opposed first front face (25X) and second front face (25Y), a central axial hole (18) and at least one lubrication-oil duct (23); autofrettaging the lubrication-oil duct (23); after autofrettaging, removing a thickness (D) of the inner disc on both faces thereof.

This invention pertains to the field of hydraulic tensioners. A hydraulic tensioner of this invention includes a tensioner body having a bore in fluid communication with a source of pressurized fluid through an inlet, a hollow piston slidably received within the bore and having an outer diameter, a hydraulic pressure chamber defined by the hollow piston and the bore of the tensioner body, a piston spring received within the hydraulic pressure chamber for biasing the piston away from the inlet, and a metallic band surrounding the outer diameter of the piston. The metallic band forms a seal between an outer surface of the piston and the tensioner body when pressure builds in the hydraulic pressure chamber, wherein metallic bands or seals are placed over a hydraulic tensioner piston in order to seal the high pressure chamber and prevent or reduce leakage through the clearance between the piston and the tensioner body.

一种十字头二冲程柴油机填料函装置，包括活塞杆（1）和填料函，该填料函包括壳体，该壳体由相连接的上半部分、下半部分及法兰（6）组成，上半部分内表面从上到下，沿轴线方向依次开设有两层环型空腔，第一层环型空腔内顺次放置刮油环（12）和第一气环密封组合，空腔腔壁上开有卸油孔Ⅰ（101），第二层环型空腔内放置有第二气环密封组合，每个气环密封组合均由分成多段环弧的密封内环和分成多段环弧的密封外环错位嵌套组合而成，下半部分内部顺次布置四层刮油环（12），上述密封外环和刮油环的圆周面上均设有至少一条环形的弹簧弧槽（108），通过安装在弹簧弧槽中的弹簧（9）将其绑缚在活塞杆外圆上，并嵌入式安装在环型空腔内。该填料函装置密封性能好，各环工作性能检测方便，拆装简单，维修成本低。

A sealing system features a primary and secondary bullet seals where the secondary seal is preferably bidirectional and is activated to spread fins with a t-shaped ring that is driven with differential pressure to advance after temperature exposure softens a stop material on the extending portion of the t-shaped ring. Opposed t-shaped rings are disposed at ends of the backup ring that have fins at both ends. Advancement of the t-shaped ring spreads the fins and retains them in the spread condition for enhanced sealing. Optionally the primary seal can also be actuated with a similar t-shaped ring with a temperature sensitive delay feature.

Seal assembly comprising a seal ring (3) sealing between an inner and outer tubular element. Inner or outer surface (7, 5) has an inclined element surface (9) against which the seal ring (3) moves, thereby altering its circumference (C). An activation arrangement (2) exerts actuation force onto the seal ring, forcing an inclined seal ring surface (11) of the seal ring (3) against the inclined element surface. The activation arrangement maintains said actuation force along a function path of the seal ring, as a result of radial expansion or reduction of the inner or outer surface. When radial distance between inner and outer surface increases, the activation arrangement moves the seal ring along the inclined element surface in one direction. When radial distance decreases, the activation arrangement is compressed, and the seal ring moves along the inclined element surface in a second opposite direction.

A seal assembly for use in a turbomachine is provided. The seal assembly has an annular division wall with outside and inside surfaces, a carrier ring disposed adjacent the inside surface of the annular division wall, and a sealing substrate metallurgically-bonded to an inner-most surface of the carrier ring. The sealing substrate is machined to form a seal surface that can be disposed proximate a rotor and maintained substantially parallel thereto during operation of the turbomachine.