Abstract: An inter stage seal housing for a turbine engine having upper and lower half inter stage seal housings in which a contact sealing surface of the seal housing is restored after an interval of engine operation. The contact sealing surface is restored by fitting a replaceable wear strip on the downstream sealing surface of the seal housing. In order to fit the replaceable wear strip, a circumferential groove is machined along an outer peripheral edge of the seal housing. The groove is machined to include axial location and radial retention such that the wear strips can be slid into the upper half and lower half inter stage seal housing circumferentially from the horizontal joint. The groove includes through holes and the wear strips include corresponding threaded holes such that the wear strips can be fastened in the groove by fasteners and fastener retention hardware.

Abstract: An intershaft seal for inner and outer coaxial shafts which rotate relative to each other. The seal is located in an annular space between the shafts and maintains an axial pressure differential between a fluid pressure on the first side of the seal and a fluid pressure on the other, second side of the seal. The seal comprises a sealing ring which is coaxial with the shafts and which forms a sealing contact with the outer shaft to maintain the pressure differential.

Abstract: A shoe device secured to a syphon is disclosed for removing condensate from an internal surface of a rotating cylinder. The shoe device includes a shoe portion which is disposed adjacent to the internal surface of the rotating cylinder. The shoe portion defines a passageway having an upstream and a downstream end. The passageway permits a flow there through of the condensate from the internal surface of the rotating cylinder, through the upstream end of the passageway to the downstream end of the passageway. The shoe portion has a first and a second side, a surface extending between the first and second sides of the shoe portion. The surface is disposed adjacent to the internal surface of the cylinder. The shoe portion also has a leading and a trailing end and a face extending between the leading and trailing ends of the shoe portion. A clamp is secured to a distal end of the syphon and is connected to the shoe portion for clamping the shoe portion to the syphon.

Abstract: A fluid seal assembly (the assembly) of the present invention is disposed between an outer surface, i.e. engine block or any other part that requires application of the assembly and a rotatable member, such as, for example a shaft, wherein the assembly circumscribes the shaft and lubricated the shaft and the same rotates around the axis. The assembly includes at least three members: a casing unit, a sealing ring unit, and a collar. The assembly eliminates problems associated with prior art designs such as static leakage of oil, clogging up the spirals with carbonized oil that negatively impact lifecycle of the fluid seals.

Abstract: A temperature responsive control system, the system including a first seal, a second seal abutting the first seal, and a thermally reactive element in contact with the first seal and/or the second seal wherein the thermally reactive element constricts to displace at least one of said first and second seals, for reducing a degree of contact pressure between the first and second seals from a first, higher level of contact pressure to a second, lower level of contact pressure, when a temperature of the first seal and/or the second seal increases to a level to activate the thermally reactive element to constrict. A water pump seal pressure system with abutting seals and a method for managing the contact between abutting seals in a system are also disclosed.

Abstract: A split mechanical end face seal assembly has a split gland plate assembly, a split mating seal ring assembly, a split primary seal ring assembly and a split biasing assembly. The segmented mating seal ring is axially and radially supported on the segmented mating ring adapter by resilient connector strips as pre-assembled sub-assemblies and the resilient connector strips axially non-rigidly support the mating seal ring within said mating ring adapter assembly. An axially movable primary sealing ring assembly includes a segmented primary seal ring. The biasing assembly is pre-assembled into the gland plate assembly and urges the primary seal ring into sealing relation with the mating seal ring. A method of installation includes resilient axial and radial support of the mating seal ring segments in mating ring adapter segments by the resilient connector strip for installation as a pre-assembled sub-assembly.

Abstract: The present invention relates to circumferential seal ring segments positioned around a rotating shaft so as to prevent fluids from leaking from a lubricant sump during both low and high pressure conditions. The circumferential seal is comprised of a plurality of adjoining annular ring segments facing the rotating shaft. Each sealing ring segment includes a dead end circumferential groove on a shaft-side face of each sealing ring such that, when the segments are joined, the circumferential dead end groove of each segment extends arcuately in the direction of shaft rotation. At least one additional groove is contained on the shaft-side face of each sealing ring segment. Each additional groove is an axial bore groove extending perpendicularly to a longitudinal axis of the seal ring segment in fluid communication with the dead end circumferential groove so as to direct fluid flow generated from a rotating shaft into the dead end circumferential groove.

Abstract: A high temperature dynamic seal and methods of assembly and use. The dynamic seal is provided as a rotating seal, which includes a stationary ring and rotating ring assembly, with a seal ring that is positioned between the stationary ring member and the rotating ring assembly. One or more high temperature seals create a seal between the stationary ring member and a device in which the dynamic seal is used. Similarly one or more high temperature seals create a seal between the rotating ring assembly and a rotating shaft of the device. One or more of the high temperature seals are formed from a metallic material with various cross-sectional shapes.

Abstract: This method for securing a cartridge mechanical face seal to a sleeve in a rotating shaft sealing assembly uses one or more plunger locks to secure the rotary face of the seal assembly to the sleeve. Such seal assemblies have been previously secured with set screws. This plunger lock method for securing the rotary face of the cartridge seal avoids the use of set screws altogether. Instead, one or more spring activated plunger locks located in the rotary face seal assembly are mated into precisely located receptacle bores in the sleeve. The resulting attachment will not leak, require additional tightening, or distort the sleeve.

Abstract: An axial face seal assembly including a seal member which is seated in a carrier, the carrier being non-rotatably connected to a base member but movable axially thereto and biased from the base member by means of a compression spring interposed between the base member and the carrier, the base member being axially and non-rotatably securable to a drive shaft by means of an open ring clamp having first end second ends. The ring clamp is supported on the base member, at least one of said first and second ends being movable relative to the other end in a circumferential direction; and wherein tightening means is rotatably journalled on the base member for adjusting the relative distance between the first and second ends of the ring clamp. A mounting fixture is likewise disclosed and cooperating with the seal assembly in a mounting procedure.

Abstract: The present invention relates to circumferential seal ring segments positioned around a rotating shaft so as to prevent fluids from leaking from a lubricant sump during both low and high pressure conditions. The circumferential seal is comprised of a plurality of adjoining annular ring segments facing the rotating shaft. Each sealing ring segment includes a dead end circumferential groove on a shaft-side face of each sealing ring such that, when the segments are joined, the circumferential dead end groove of each segment extends arcuately in the direction of shaft rotation. At least one additional groove is contained on the shaft-side face of each sealing ring segment. The additional groove(s) directs and creates pressurized air within the dead end circumferential groove, either directly or indirectly maintaining a seal between the ring segments and the shaft. A bleed hole may also be provided to create a seal between each sealing segment.

Abstract: The present invention relates to the process for preparing hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art.

Abstract: A mechanical seal assembly for a rotatable shaft is disclosed. In one embodiment, the mechanical seal assembly comprises a first sealing element configured to surround a rotatable shaft, the first sealing element including an annular plate, and a plurality of annular rings that protrude from the annular plate in a direction substantially parallel to the rotatable shaft. The annular rings are concentric with the rotatable shaft. A second sealing element is configured to surround the rotatable shaft, with the second sealing element including one or more springs that provide a biasing force against the first sealing element such that substantially constant contact is maintained between the annular rings and a sealing surface. One or more lubricant cavities are defined between the annular rings and the sealing surface.

Abstract: A heat exchanger 500 for transferring heat between a first gas flow 28, such as flue gases, and a second gas flow 34, such as air or oxygen, includes a housing 514 having a first inlet plenum 520 for receiving the first gas flow 28, a first outlet plenum 522 for discharging the first gas flow 28, a second inlet plenum 526 for receiving the second gas flow 34, and a second outlet plenum 528 for discharging the second gas flow 34. The heat exchanger 500 further includes heat exchange elements 512 disposed within the housing 514. Radial seals 224, 226, 228, 230 are disposed between the housing 514 and the heating elements 512 that define a radial plenum 535, 536. Axial seals 220, 222 are further disposed between the housing 514 and the heating elements 512 to define an axial plenum 530. A third gas flow, such as recirculated flue gas, is provided in the radial plenum 535, 536 and the axial plenum 530 to reduce the leakage between the first gas flow 28 and the second gas flow 34.

Abstract: The present invention relates to hydrogenated nitrite rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art. The present invention is also related to shaped articles containing hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art.

Abstract: An improved cartridge-type bearing seal includes removably connected stator and rotor sections. The stator section supports a distribution ring that divides an internal annular volume into radially outside and inside portions. The ring has a sufficient number of tangentially oriented ducts to permit fluid communication between the outside and inside portions. With this structure, when pressurized purge fluid is supplied to the outside portion, the fluid flows through the ducts, to induce a desired tangential fluid flow within the inside portion. This in turn causes circumferentially uniform fluid pressure in the annular volume that resides between the rotating shaft and the bearing housing, and the pressurized fluid traverses a flow path out of the bearing. This circumferentially uniform fluid pressure, by itself or in combination with a flexible lip, prevents contaminant ingress between the rotating shaft and the bearing housing.

Abstract: A seal assembly (100) for sealing a rotatable shaft entering a workspace is provided, the seal 5 assembly (100) comprising first and second sets of seal rings (110?, 110?; 170, 170?) separated by a space defined by the seal ring sets (110?, 110?; 170, 170?), an outer surface of a shaft sleeve (120) or the shaft and an inner surface of a body (140, 150) circumventing 10 the outer surface of the shaft sleeve (120) or the shaft and filled with a lubricating and/or cooling fluid, wherein the outer surface of the shaft sleeve (120) or the shaft is provided with grooves (120?), or any other irregular surface, wherein the space is 15 provided with at least one fluid directing member (160, 160?) that is configured to provide homogenous distribution of lubrication and/or homogenous distribution of cooling over a substantial part of the seal assembly (100) in interaction with the shaft 20 sleeve or the shaft. A method and a system are also provided.

Abstract: A seal is used between a housing and a shaft having an axis. The seal includes a first portion and a second portion engageable with each other and movable relative to each other. The first portion and the second portion are configured to be received in a cavity between the shaft and the housing. The first portion is engageable with the shaft such that the first portion is substantially stationary relative to the shaft and to inhibit passage of contaminants from the exterior of the cavity through the cavity toward the axis. The second portion is engageable with the housing such that the second portion is substantially stationary relative to the housing and to inhibit passage of the contaminants from the exterior through the cavity toward the axis.

Abstract: The invention provides an improved rotating seal apparatus including a plurality of concentrically spaced annular rotating seals. The invention also provides a rotating seal apparatus including a pressurized annular chamber surrounding an annular rotating seal.

Abstract: A high temperature dynamic seal and methods of assembly and use are presented. In one embodiment, the dynamic seal is provided as a rotating seal, which includes a stationary ring and rotating ring assembly, with a seal ring that is positioned between the stationary ring member and the rotating ring assembly. In some embodiments, one or more high temperature seals create a seal between the stationary ring member and a device in which the dynamic seal is used. Similarly one or more high temperature seals create a seal between the rotating ring assembly and a rotating shaft of the device. In one aspect, one or more of the high temperature seals are formed from a metallic material with various cross-sectional shapes.

Abstract: A hermetic seal includes a face seal ring having a first end sealing face and a second end sealing face, a first sealing profile in contact with the first end sealing face, and a second sealing profile in contact with the second end sealing face. The face seal ring comprises a shape memory material. A hermetically-sealed, threaded joint includes a pin sub defining a first sealing profile, a box sub defining a second sealing profile, and a face seal ring comprising a shape memory material. The pin sub is threadedly engaged with the box sub. The face seal ring has a first end sealing face in contact with the first sealing profile and a second end sealing face in contact with the second sealing profile. The face seal ring is disposed about the pin sub.

Abstract: A bushing includes an interior surface, an exterior surface, a first end, and a second end. An end face forms at least part of each of the first end and the second end. At least one of the exterior surface and the end face includes a sealing surface formed at least in part of a coating including a material having a hardness level greater than about 1200 Knoop. The sealing surface has a thickness greater than about 35 microns and an average roughness (Ra) less than about 0.25 micron. In one embodiment, the bushing may be used on an endless track for a track-type work machine.

Abstract: A shaft sealing assembly for static and dynamic axial sealing of a centrally located rotating and movable shaft is provided. The assembly includes at least one first sealing member for sealing said shaft, at least one rotor member-attached to said shaft, and a stator member attached to a housing. A first sealing member is arranged in a recess in said rotor member effectively sealing one side of the assembly from its other side when a pressure difference exists between the media on the two sides of the assembly. Upon rotation of the shaft, the static sealing member is centrifugally moved axially and radially away from its static sealing position and friction between the sealing member and the stator is eliminated. Dynamic sealing is affected by a pressure difference caused by a turbine effect of the rotor member.

Abstract: The present invention relates to circumferential seal ring segments positioned around a rotating shaft so as to prevent fluids from leaking from a lubricant sump during both low and high pressure conditions. The circumferential seal is comprised of a plurality of adjoining annular ring segments facing the rotating shaft. Each sealing ring segment includes a dead end circumferential groove on a shaft-side face of each sealing ring such that, when the segments are joined, the circumferential dead end groove of each segment extends arcuately in the direction of shaft rotation. At least one additional groove is contained on the shaft-side face of each sealing ring segment. The additional groove(s) directs and creates pressurized air within the dead end circumferential groove, either directly or indirectly maintaining a seal between the ring segments and the shaft. A bleed hole may also be provided to create a seal between each sealing segment.

Abstract: Compressor comprising a housing (1a, 1b) and with at least one partly electric-motor-driven impeller (3) arranged on a central shaft (5). The invention is characterized in that the impeller (3) is provided with a tubular part (6) surrounding the central shaft (5), and also in that a tubular carrier (2) extending in between the central shaft (5) and the tubular part (6) is arranged firmly on the housing, in which carrier (2) the central shaft (5) is rotatably mounted.

Abstract: A rotor shaft sealing method for an oil-free rotary compressor is provided, with which occurrence of lubrication oil intrusion into the compression chamber of the compressor which is liable to occur when negative pressure is produced in the compression chamber, is prevented.

Abstract: This method for securing a cartridge mechanical face seal to a sleeve in a rotating shaft sealing assembly uses one or more plunger locks to secure the rotary face of the seal assembly to the sleeve. Such seal assemblies have been previously secured with set screws. This plunger lock method for securing the rotary face of the cartridge seal avoids the use of set screws altogether. Instead, one or more spring activated plunger locks located in the rotary face seal assembly are mated into precisely located receptacle bores in the sleeve. The resulting attachment will not leak, require additional tightening, or distort the sleeve.

Abstract: A hydrostatic mechanical seal assembly includes a locally deployed pump for pressurizing a lubricant fluid between the opposing faces of a mating ring and a sealing ring. In one exemplary embodiment, such pressurization may be achieved via a device that converts the rotational motion of a drive shaft into fluid pressure. The locally deployed pump is intended to advantageously provide a stable positive pressure on the sealing interface between the mating and sealing rings, which may provide improved sealing characteristics, especially in demanding downhole environments.

Abstract: A top drive system including, in certain aspects, a motor, a gear system below, and driven by the motor, a space between the top drive motor and the gear system, a seal assembly for inhibiting oil for lubricating parts of the gear system from flowing into the space, the seal assembly having a movable rod piston, a sealing arm projecting from the rod piston, at least one removable seal secured to the sealing arm, a seal member releasably secured to the gear system, and the movable rod piston movable to move the sealing arm to bring the at least one removable seal into sealingly contact with the seal member to inhibit oil from flowing into the space.

Abstract: A sealing method and apparatus is provided for sealing between a rotating shaft and a fixed housing such as found in scraped surface heat exchangers. The sealing apparatus and method includes a sealed cartridge where a gland and a trapped seal ring can be releaseably assembled so that in a fully assembled configuration the gland and the trapped seal ring rotate together and are rotationally connected by a ball trapped between an indentation in the gland and an indentation in the trapped seal ring.

Abstract: A split seal component includes two seal face segments in two holder halves and a method of assembly and installation. Each seal face segment has a primary sealing surface and a section extending axially from each primary sealing surface The holder halves are adapted to be joined together to rigidly hold the circular seal face. The holder being constructed and arranged to mount to a shaft.

Abstract: The present invention relates to hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art. The present invention is also related to shaped articles containing hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art.

Abstract: The present invention relates generally to a technical domain of a sliding element engaging a relative rotational motion. A primary objective of a sliding element of the present invention is to decrease a friction coefficient of the sliding face and to improve the seal performance. The element disposes dimples on at least one sliding face of a pair of relatively rotating sliding faces wherein the dimples are inclined towards a rotary direction when viewed along a radial direction. The sliding face of the sliding element also disposes a plurality of ring-formed dimple sections which form annuli of distinct diameters wherein the dimples are arranged along the individual annuli. The sliding face also disposes annular dam sections which are located between the individual dimple sections.

Abstract: Advantageous seal systems (1500) are provided that include a barrier member movable relative (1504) to a shaft (1550) to allow sequential engagement of resilent seal members (1506), e.g., lip seals, with the shaft. Movement of the barrier member (1504) may be effected manually or through introduction of pressurized fluid to effect piston-like movement. The disclosed seal assemblies may include an automatic leak detector and may utilize such leak detection to effectuate automatic movement of the barrier member. The barrier member may be moved relative to the shaft while the shalt is in movement, e.g., rotating or reciprocating, thereby permitting seal maintenance without interruption in operation. As seal members are sequentially brought into sealing engagement with the shaft, the previously engaged seal members contribute to the sealing performance of the seal assembly, although no longer effective to establish a stand-alone seal with the shaft.

Abstract: A top separator assembly for a digester is disclosed comprising: a rotatable shaft for the top separator; a packing for the shaft; and a sealing ring operatively mounted to the shaft and having a nominal clearance with the pack box, said sealing ring mounted so that up lifting of said shaft provides a substantially fluid tight seal between said pack box and a side of said ring (in the digester) opposite the pack box.

Abstract: A mechanical seal comprises a drive end, a seal face holder with a seal face inserted into the seal face holder. A metal bellows stack is located between the drive end and the seal face holder, and a drive sleeve is secured to the drive end. The drive sleeve is a separate component to the drive end and the drive sleeve is located radially inwardly of the metal bellows stack.

Abstract: A top separator assembly for a digester is disclosed comprising: a rotatable shaft for the top separator; a packing for the shaft; and a sealing ring operatively mounted to the shaft and having a nominal clearance with the pack box, said sealing ring mounted so that up lifting of said shaft provides a substantially fluid tight seal between said pack box and a side of said ring (in the digester) opposite the pack box.

Abstract: In a gas turbine, a supplemental seal is provided between an annular axially facing sealing surface of a nozzle support ring and an annular axially opposed sealing surface formed by circumferentially adjacent nozzle segments. Each segment carries an inner rail mounting a chordal hinge seal which engages the sealing surface of the nozzle support ring. That seal is supplemented by a generally arcuate V-shaped seal between the sealing surfaces which opens radially inwardly toward a high pressure leakage path past the chordal hinge seal. The supplemental seal is initially compressed and maintained in a compressed condition during installation by application of a solder. At operating temperature, the solder melts away, releasing the supplemental seal to seal between the nozzle support ring and nozzle segments.

Abstract: A method of forming a seal assembly around a shaft is disclosed. The method includes (a) urging a first seal member against a second seal member so as to produce a load between a first seal face and a second seal face, (b) measuring the load produced between the first seal face and the second seal face during the urging step, and (c) securing a first support member to the shaft when a predetermined load value between the first seal face and the second seal face is attained so as to fix the relative position between the first seal member and the second seal member such that the predetermined load is substantially maintained between the first seal face and the second seal face. An associated seal assembly geometry is also disclosed.

Abstract: A split seal component includes two seal face segments in two holder halves and a method of assembly and installation. Each seal face segment has a primary sealing surface and a section extending axially from each primary sealing surface. The holder halves are adapted to be joined together to rigidly hold the circular seal face. The holder being constructed and arranged to mount to a shaft.

Abstract: Cylinder that includes at least one stationary portion and at least one rotatable portion and a support and a method for sealing the same. The at least one rotatable portion includes a bearing axle rotatably coupled to the support, and the at least one stationary portion includes at least one stationary connection that is rotatably coupled to the bearing axle and that is adapted for at least one of inserting and removing at least one of a heating and cooling medium through the bearing axle. The cylinder also includes a sealing device that is composed of at least one brush seal and that is positioned between the at least one stationary portion and the at least one rotatable portion. The method includes rotatably coupling a bearing axle of a rotatable cylinder to a support. The bearing axle is fixedly coupled to a rotatable member and includes a channel adapted for at least one of insertion and removal of at least one of a heating and a cooling medium through the bearing axle.

Abstract: A mechanical seal for providing fluid sealing between a housing and a rotatable shaft includes a first seal ring having a first seal face and a second seal ring having a second seal face. The first seal face further has a first portion and a second portion and the seal faces of the first and second seal rings are opposed to each other when assembled. The first seal ring or the second seal ring is adapted to rotate with the rotatable shaft, and the other seal ring is restrained from rotating. The seal is a non-contacting seal that provides for the introduction of a barrier fluid between the seal faces. A first surface of the first seal ring and a first surface of the second seal ring are exposed to the process fluid. An opening force is developed between the first and second seal faces that inhibits contact between the seal faces.

Abstract: A contact surface of a seal having textured features is described. The contact surface seals properly and is resistant to wear. The contact surface is able to perform in very severe environments, such as those found in earthmoving applications.

Abstract: A split mechanical face seal assembly for mounting around a shaft, and having two holder halves, each of the two holder halves having first and second axial ends, each first end defining a counterbore formed therein, a seal face half received in the counterbore of each of the two holder halves, a resilient mounting in the counterbore of each of the two holder halves to seal the respective seal face half relative to its holder half, a resilient member in the counterbore of each of the two holder halves biasing the seal face half outwardly of its counterbore, a separate split retainer ring half located between and engaging each biasing means and its respective seal face half and an annular member for securing the two holder halves to each other around the shaft. A method of assembling and installing a split mechanical face seal around a shaft that extends from a housing.

Abstract: A mechanical end face seal for sealing between a housing and a relatively rotating shaft which includes a pair of relatively rotating annular rings having seal faces in sealing contact with each other to define a seal interface. A generally annular flexible metal diaphragm is secured between an axially movable ring and either the housing or shaft in a configuration such that it is placed in tension to achieve a preload or initial closing force upon the seal faces. In one form the seal components are unitized into a single assembly. A retainer is adapted to be disposed in a bore of the housing in surrounding relation to the shaft. The seal rings are disposed intermediate the axial ends of the retainer with the generally annular flexible metal diaphragm secured to one end of the retainer to define one closure wall of the assembly and to capture the ring components within the retainer.

Abstract: A mechanical seal assembly for creating a sealing relationship between a housing and a shaft which is rotatable relative thereto. The seal assembly includes first and second coaxially aligned and axially adjacent seal rings disposed in an encircling relationship to the shaft and having axially adjacent and opposed flat seal faces for creating an annular sealing region therebetween. The first and second seal rings are respectively nonrotatably coupled to the housing and the shaft. A chamber is defined adjacent one seal ring and is in communication with a controlled pressurized fluid source which supplies a fluid to the chamber. The chamber opens toward a rear surface of the seal ring to apply a closing force to the seal ring to axially move the seal ring toward the opposing seal ring.