Abstract: A seal device for sealing between a wall (3) and a shaft (5), especially in a pump, comprising a stationary, preferably ceramic, seal element (13), which is connected to the wall, and a movably, preferably ceramic, seal element (14) which is connected to the shaft and which seals against the stationary seal element. At least one of the seal elements is attached directly to a holding member (12), which is connected to the wall alternatively to the shaft. The seal element (13) of the holding member is provided with a circumferential surface (18), which, in the alternative in which the holding member is connected to the wall, extends in the hole (7) of the wall (3) in such a manner that an annular gap is formed between the wall and said circumferential surface. An elastic sealing ring (20) is provided in said gap for sealing between the wall and the seal element of the holding member.

Abstract: A slide ring seal, including a slide ring and a counter-ring. The slide ring and the counter-ring sealingly contact each other at sealing surfaces so as to be relatively twistable and acted upon by spring tension under axial prestressing. The slide ring, via a first sealing ring, is sealingly connected to a first drive ring in a rotatably fixed manner and/or the counter-ring, via a second sealing ring is sealingly connected to a second drive ring in a rotatably fixed manner. The first sealing ring and/or the second sealing ring, on the side of a flange of the respective drive ring facing the medium to be sealed off, is essentially completely overlapped.

Abstract: A dry gas seal has a housing with an annularly-shaped channel disposed concentric with the drive shaft, and an inlet to introduce pressurized buffer gas into the housing interior. An annularly-shaped shutdown piston is slidably received in the housing channel for axial shifting, and includes a circumferential seal between its inside and outside surfaces, and an end seal. A biasing member resiliently urges the shutdown piston toward an open position, such that during compressor operation, the forces generated by the biasing member combined with the pressure of the buffer gas acting on the piston's interior face retain the shutdown piston in the open position. During compressor shutdown, when the pressure of the buffer gas drops, the pressure of the process gas acting on the piston's exterior face overcomes the combined forces of the biasing member and the buffer gas to shift the shutdown piston to a closed position against an adjacent sealing surface to prevent contaminates from entering the housing interior.

Abstract: The invention is based on a device for sealing off a chamber (10) with lubricant (12) on a rotationally drivable component (14) from a second chamber (16), in particular at a peg of a power tool, having at least one seal (20) sliding at a contact face (18).

Abstract: An improved modular, radially-compliant, redundantly-sealing journal-type bearing assembly comprising two bearing elements retained in a housing and positively loaded in opposing directions by a compression spring disposed therebetween. A shaft to be supported and sealed against leakage by the bearing, such as a valve pintle shaft, is disposed in an axial bore in each of the bearing elements, which bores are fitted as closely to the diameter of the shaft as is possible without causing the shaft to bind in the bores. Each of the radial bearing faces opposite the spring forms a seal with a corresponding internal surface of the housing, defining thereby a redundant sealing system. The bearings are radially compliant within the housing by a predetermined small distance to allow the shaft to be operatively self-centered, such as by an attached valve head mating into a valve seat.

Abstract: An axial face seal, in particular a running gear seal, consists of an angular sliding ring and/or counter-ring with a circumferential surface for accommodating a ring-shaped sealing member with approximately plate-shaped cross section. The sealing member contains a secondary seal guided in the area of the sealing leg, wherein the sealing leg of the sliding ring and/or counter-ring is provided on the ring backside with an axial projection extending in the direction of the sealing member. The secondary seal in the non-assembled state is positioned at a radial distance to the sealing leg or the projection and has at least in part a larger diameter than the sealing member. At least the free end of the secondary seal can be positioned with radial compression on the sealing leg or the projection with the aid of a component that accommodates the sealing member.

Abstract: A split mechanical face seal assembly wherein stator and rotor face rings and their respective surrounding collar and gland are all split substantially diametrically and are partially factory preassembled to facilitate shipping, handling and subsequent assembly onto a machine at the job site. The split rotor face ring and the split supportive collar have the cooperating parts thereof subassembled into two subassemblies which define opposed halves for permitting them to be assembled on diametrically opposite sides of a shaft, with each subassembly having the rotor face ring segment carried on the support collar segment, and an elastomeric seal ring which cooperates between the segments being preassembled therebetween. The stator face ring and its supporting gland ring also have the respective split segments thereof, and the other cooperating components such as seal rings and the like, preassembled at the factory to define a pair of subassemblies.

Abstract: The compression ring 21 is mounted on the seal ring 20 at the end thereof. The compression ring 21 has the outer circumference projections 30 that are fixed in the groove 40 extending in the axial direction at the inner surface of the flange 22 . With this construction, the compression ring 21 can move in the axial direction and is stopped in the rotational direction. The compression ring 21 is pressed by the springs 23. Thus the compression ring 21 works as a stopper to stop the rotation of the seal ring 20 and as a spring receiver.

Abstract: A non-contact-type mechanical seal that keeps a rotary seal ring 6 from vibrating in what is called a pneumatic hammer fashion. For this purpose, an annular space 23 is formed between an outer circumferential surface 21a of the rotary seal ring 6 and an inner circumferential surface 13a of a holder portion 13 of a spring retainer 5. The annular space 23 is sealed by a pair of O rings 22, 22. In addition, seal gas leading passages 24 are provided in the rotary seal ring 6 through which spaces between seal end faces 3a, 6a communicate with the annular space 23. Seal gas 8 is supplied to static pressure generating grooves 15, and led into the annular space 23 through seal gas leading passages 24. The seal gas presses O rings 22, 22 against the outer circumferential surfaces of the rotary seal ring 6 and the inner circumferential surface of the holder portion 13 of the spring retainer 5, thereby firmly holding the rotary seal ring 6.

Abstract: An improved mechanical seal assembly is provided for sealing rotating shafts with respect to their shaft housings, wherein the rotating shafts are subject to substantial axial vibrations. The mechanical seal assembly generally includes a rotating sealing ring fixed to the shaft, a non-rotating sealing ring adjacent to and in close contact with the rotating sealing ring for forming an annular seal about the shaft, and a mechanical diode element that applies a biasing force to the non-rotating sealing ring by means of hemispherical joint. The alignment of the mechanical diode with respect to the sealing rings is maintained by a series of linear bearings positioned axially along a desired length of the mechanical diode. Alternative embodiments include mechanical or hydraulic amplification components for amplifying axial displacement of the non-rotating sealing ring and transfering it to the mechanical diode.

Abstract: A mechanical seal of the invention includes relatively rotatable seal rings and a secondary seal therefore. The secondary seal is a C-shaped spring loaded gasket having upper and lower gasket legs. The gasket is provided between two of the seal components, for example, between an axially movable seal ring and a bellows flange. The gasket has one leg thereof confined axially to transmit axial loads between the seal ring and the bellows flange. Also, the upper and lower gasket legs are biased axially apart by a spring to permit radial movement between the seal ring and the bellows flange and also accommodate different rates of thermal expansion between the seal ring and bellows flange.

Abstract: A system is provided for sealingly coupling a gear reducer to a driven machine, such as a screw conveyor. The gear reducer includes a sealing assembly disposed in a bore of the gear reducer housing about an output member, such as an output hub. An adapter element couples the gear reducer to the load, such as directly to a screw conveyor trough. A first seal assembly is disposed in the adapter about an output shaft received in the output hub of the gear reducer. For a screw conveyor application, the first seal assembly may be adjacent to the screw conveyor trough plate. The adapter includes a second seal assembly within an interface flange which is secured to the gear reducer housing. The first and second seal assemblies are spaced from one another by a dropout area defined by integral standoffs of the adapter.

Abstract: A water pump with a plurality of elastomeric blades on a rigid impeller is disclosed. The impeller has a tubular extension with a pair of flats on the outer diameter of the extension. The seal seat has a corresponding pair of flats on its inner diameter to engage the flats on the tubular extension for positive rotation. The impeller also has a retaining lip formed on its inner diameter and a sealing shoulder to form a retaining cavity along the tubular extension. The retaining lip receives the seal seat in the cavity by stretching the lip radially into a gap to accommodate the outer diameter of the seal seat. This stretch to fit feature eliminates the need to control the outer diameter of the seal ring to precise dimensions. The lip forms a static seal with the outer diameter of the seal seat. The elastomeric shoulder provides a static seal against the seal seat.

Abstract: An improved modular, radially-compliant, redundantly-sealing journal-type bearing assembly comprising two bearing elements retained in a housing and positively loaded in opposing directions by a compression spring disposed therebetween. A shaft to be supported and sealed against leakage by the bearing, such as a valve pintle shaft, is disposed in an axial bore in each of the bearing elements, which bores are fitted as closely to the diameter of the shaft as is possible without causing the shaft to bind in the bores. Each of the radial bearing faces opposite the spring forms a seal with a corresponding internal surface of the housing, defining thereby a redundant sealing system. The bearings are radially compliant within the housing by a predetermined small distance to allow the shaft to be operatively self-centered, such as by an attached valve head mating into a valve seat.

Abstract: The present invention relates to a shaft seal (1) comprising a sealing element (14) mounted co-axially to a rotary sealing ring (10) to form a primary seal between opposed faces thereof to substantially prevent fluid flow across the primary seal. The sealing element (14) is urged axially towards the rotary ring (10) by a springs (15) acting between a pusher sleeve (17) connected to the sealing element 14 and a seal housing (19). A secondary seal formed between the pusher sleeve (17) and the housing (19) by a sealing member (20) located in a channel (21) in the pusher sleeve (17).

Abstract: A seal device for creating a seal between a rotatable shaft and a stationary member. The seal device includes a seal member having a generally annular body including a generally cylindrical inner wall forming a bore that extends through the body and a sealing surface adapted to rotatably and sealingly engage the stationary member. The body includes a generally annular flexible finger seal member having a base attached to the body and a generally circular peripheral tip that defines an aperture. The bore of the seal member and the aperture of the finger seal member are adapted to receive the shaft such that the tip of the finger seal member is in static sealing engagement with the shaft. A coupling member is adapted to attach the seal member to the shaft for conjoint rotation therewith and to resiliently bias the sealing surface of the seal member into rotating sealing engagement with the stationary member.

Abstract: An improved seal for defining a back pressure chamber in a scroll compressor includes a tab extending toward the rear face of the orbiting scroll. The tab reduces the contact force created against the rear face of the orbiting scroll by the gas pressure in the back pressure chamber. Thus, the inventive seal increases seal life.

Abstract: This invention relates to a seal apparatus for providing sealing engagement between a vessel and a rotatable shaft extending through a wall of the vessel. An insert retainer is connected with respect to the vessel and around and apart from the rotatable shaft. A shaft ring is connected to the rotatable shaft and rotatably positioned within the insert retainer. An insert is biased against the shaft ring and seated at least partially within the insert retainer. A retainer assembly is connected to the insert retainer and preferably biases the insert against the shaft ring. Seals, such as O-rings, may be placed around the circumference of the insert and/or around the interior of the shaft ring to further effectuate a seal between the vessel and the rotatable shaft.

Abstract: A mechanical seal assembly is adapted for use with a shaft supported by a bearing, the mechanical seal assembly being located near the bearing. The mechanical seal assembly includes a rotating member attached to the shaft and stationary member engaging the rotating member so that, when the shaft rotates, frictional heat is generated. The mechanical seal assembly includes a thermal barrier for reducing the amount of frictional heat reaching the bearing, thereby reducing the effect of the frictional heat on the lubrication of the bearing.

Abstract: In order to ensure that the working life of the sealing device is at least comparable to that of the remaining parts of the crawler track, the resilient annular element comprises a first annular portion and a second annular portion. The first annular portion has a cross-section in the form of a bulge, while the second annular portion has a cross-section in the form of a boss. The first annular portion is delimited by an annular contact surface which, when the annular seal is assembled, but not mounted in its seat, forms together with the incident joining plane of the rigid annular sealing element, an angle “&agr;” of between 0° and 30°.

Abstract: A face seal is provided for a rotating shaft for sealing between a normally high pressure region and a normally lower pressure region, having a seal ring shaped to form a gap between the ring and a runner surface on the shaft, which gap converges in the direction of fluid flow and deliberately creates turbulent flow along the seal gap and sufficient clearance between the rotating runner and the seal ring to accommodate distortions in the seal ring which may occur over its lifetime. A servo system is coupled to the seal ring which moves the seal ring away from the runner during low pressure differences between the regions and which restores the sealing function along the seal gap when the pressure difference between the regions increases sufficiently.

Abstract: A mechanical seal having two balance diameters and balance factors established separately and freely for two fluids which are opposed at a sealing face by providing two seal packings with a seal ring. A sidewall of a packing groove is removed on the sealed fluid side when the sealed fluid contains crystal deposits or solid substances, and a vacuum path is connected between the two seal packings. Also, a seal ring can be divided between the two seal packings into two parts so as to provide flexibility against deflection in a radial direction.

Abstract: The present invention relates to a non-contact shaft seal (1) comprising a sealing element (14) mounted co-axially to a rotary sealing ring (10) to form a primary seal between opposed faces thereof to substantially prevent fluid flow across the primary seal. The sealing ring (10) is mounted about the shaft (2) on an inner sleeve (11). The inner sleeve is fixed to the shaft to be axially and rotationally fast. The sealing ring (10) is connected to the inner sleeve (11) by half-moon shaped locking members (12) extending through the inner sleeve (11) outwardly into the sealing ring (10). The locking members (12) lock the sealing (10) rotationally and axially fast on the inner sleeve (11).

Abstract: A sealing arrangement for sealing lubricating oil in and debris out of a final drive of an earth moving machine is disclosed. The sealing arrangement includes a secondary seal for use in severe environments to protect a primary oil seal. The secondary seal is disposed radially outboard of the primary seal and includes a continuous annular ring having a wear resistant reinforced composite sealing portion. The sealing portion is constructed of a cured mix of an elastomer and reinforcing fibers, having an axial sealing face positionable in dynamic sealing contact with a radial surface of a first member of the final drive.

Abstract: A metal-to-metal face seal assembly comprises a static seal ring secured to a rotating element, such as a track roller of a tracked machine. The static seal ring has a seal face, and a dynamic seal ring has a seal face in sealing engagement with the seal face of the static ring. The dynamic seal ring has a ramp thereon extending at 8 degrees relative to horizontal in a direction away from the seal face thereof. The seal assembly further includes a seal housing, which may be the end collar of the track roller, having an annular ramp formed thereon confronting the ramp of the dynamic seal ring, which seal housing ramp extends at 10 degrees relative to horizontal. The ramps converge in a direction away from a seal plane defined by the mutually-engaging faces of the seal rings. A load ring disposed between the ramps is pre-compressed to its maximum strain level to provide the desired face loads on the seal faces.

Abstract: An earth-boring bit has a bit body and at least one bearing shaft depending inwardly and downwardly from the bit body. The bearing shaft has a base where it joins the bit body. At least one cutter is mounted for rotation on the bearing shaft and has radial and axial surfaces that cooperate with the base of the bearing shaft to define a bearing seal gland. A bearing is defined between the cutter and bearing shaft. A seal element is disposed in the seal gland. A secondary seal is disposed in the seal gland opposite the cutter axial surface and cooperates with the seal element to at least partially seal the gland against entry of debris from the exterior of the bit.

Abstract: A sealing device comprises a slide ring and a counterring having sealing surfaces, the slide ring and counterring contacting one another under axial prestressing in a sealing manner and capable of rotating relative to one another, the counterring and a substantially L-shaped engaging ring being interconnected, the engaging ring being affixed to a shaft to be sealed, and the counterring and the engaging ring being sealed relatively to each other by a sealing ring. The counterring contacts a radial segment of the engaging ring and surrounds an axial segment with radial clearance, and the sealing ring is sealingly arranged, under elastic prestressing, in the gap formed by the clearance. The counterring has an inner peripheral surface which forms an angle .alpha. of about 0.5.degree. to about 60.degree. with an axis of rotation, and the radial clearance in which the sealing ring is arranged is greater on the side facing the radial segment of the engaging ring than on the side facing the slide ring.

Abstract: A sliding ring seal includes a counter ring and an adjusting ring configured as a buttress. The counter ring and the adjusting ring are interconnected in a manner that does not allow for relative rotation, and they enclose a shaft to be sealed, also in a manner that does not allow for relative rotation. At least one sealing ring made of an elastomeric material seals the counter ring and the adjusting ring with respect to each other and with respect to the shaft. A sliding ring is joined to a housing and is sealed with respect thereto by means of at least one further sealing ring. The sliding ring is joined to the housing in an axially resilient manner that also does not allow for relative rotation. The counter ring and the sealing ring respectively include sealing surfaces that contact one another sealingly under an elastic preload. The sealing rings are arranged, sealingly and under the elastic preload, in a corresponding installation space.

Abstract: A sealing device comprises a slide ring having a sliding surface and a counterring affixed to a shaft, the sliding surface of the slide ring sealingly contacting the counterring and capable of rotating relative to the counterring, the slide ring, on a side facing away from the sliding surface, being sealed relative to a retaining ring by a sealing element of elastomeric material, the retaining ring being biased by a compression spring away from a housing which has an essentially C-shaped cross-section open in the direction of the slide ring. The sealing element is constructed as a ring-shaped bellows and has an essentially N-shaped cross-section with a first radial segment and a second radial segment which are connected by an axial segment. The first radial segment sealingly contacts an end face of the slide ring facing away from the sliding surface, and the second radial segment sealingly contacts an inner segment of the housing.

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 seal assembly 18 for blocking the leakage of fluid between a first region 26 and a second region 28 is disclosed. Various construction details are developed for improving the sealing capability under operative conditions which cause a severe reverse pressure gradient across the seal assembly. In one particular embodiment, the seal assembly includes a seal 36 having a front 88 which faces the first region and a pair of sidewalls 92, 94 which extend from the front and are urged apart by a spring means 96.

Abstract: A magnetic rotary seal is provided for sealing a shaft to a housing, comprising a rotary seal head having a first annular surface; a first O-ring disposed between the rotary seal head and the shaft for sealably coupling the rotary seal head to the shaft; a housing adaptor disposed within the housing; a magnetic stationary ring disposed within the housing adaptor, wherein the stationary ring includes a second annular surface; a second O-ring disposed between the housing adaptor and the stationary ring for sealably coupling the stationary ring to the housing adaptor; and a plurality of magnets disposed within the rotary seal head for urging the first annular surface against the second annular surface. The second O-ring is held within opposing circumferential grooves formed in the housing adaptor and the stationary ring, which prevents the stationary ring from leaving the housing adaptor.