Abstract: A gas turbine abradable seal is prepared by plasma spraying an oxidation resistant metallic material and boron nitride. The resultant structure comprises a metallic matrix encompassing a lubricating amount of boron nitride, with porosity of less than about 15 percent and a fabricated surface roughness of less than about 600 microinches. The reduced surface roughness and substantially reduced permeability of this seal provide substantially enhanced engine efficiency, and improved durability.

Abstract: A particle exclusion assembly designed to operate in an inclined position and to protect an associated sealing assembly. The assembly includes radially inner and outer relatively rotatable walls and axially inner and outer baffles and a rotary, controlled porosity, open-celled element which substantially fills the cavity between the two walls and the two baffles. The open-celled element controls the rate of movement of particulate material and restricted annular opening is provided to control ingress and egress of particulate material from the open-celled element.

Abstract: Non-contacting seal for shafts rotating at high speeds with improved centering means for low unbalance of seal rotating parts. Centering means comprise a shallow circumferential groove with slanted sides and an elastic centering strip of ladder-like form between two cylindrical surfaces to be held concentric. Since slanted sides of the groove overlap sides of the centering strip it cannot be displaced out of its groove during assembly, or during operation. Displaced centering strip could cause unbalance, vibrations, damage to the seal or to the surrounding equipment.

Abstract: An apparatus for sealing shut-off devices located in gas or liquid transporting pipelines having a sealing arrangement, which seals the shut-off device against a casing, the sealing arrangement having a gasket engageable against the circumferential surface of the shut-off device, a seating ring supporting the gasket, two chambers which can be supplied in a controlled manner with a pressure medium, and a method by which the gasket can be raised from the circumferential surface and pressed against the circumferential surface. The sealing arrangement has a driving member positively connected to the seating ring and a displaceable intermediate piston located on the driving member. The first chamber is located between the driving member and the intermediate piston and when subject to the action of the controlled pressure, brings about a movement of the driving member in the gasket raising direction.

Abstract: A wire harness grommet has a funnel-like shape having a wire-passing tubular portion of a small diameter, and a partition wall-mounting portion extending from the tubular portion. The bonding between a filler layer, which is provided in a hollow portion of the funnel-shaped portion, and an inner wall surface is enhanced to thereby prevent the separation of the filler layer. Removal of the grommet from a mold can be effected satisfactorily. The inner wall surface is in the form of tiling in which flat plateaus are densely arranged and spaced from one another by joint grooves, so that the inner wall surface serves as a separation prevention surface.

Abstract: A centrifugal pump includes a liquid-filled interior space that is sealed by a thrust cover. The thrust cover is provided with an opening for the introduction of a shaft on the side of the thrust cover remote from the pump's interior space. A first counter abutment is disposed in the thrust cover for a first slip ring shaft seal. The thrust cover is provided with a second counter abutment for a second slip ring seal. The first and second counter abutments are disposed at different diameters and are axially offset with respect to each other. The radial distance between the first and second counter abutments is of a predetermined magnitude so that the first slip ring seal and the second slip ring seal are disposed at two different diameters.

Abstract: A sealing device on a pipe includes an elastic sealing ring of generally U-shaped cross-section, which is clamped on the pipe by a clamping strap. The U-flanges of the sealing ring are so loaded by the pressure exerted by the clamping strap on the U-web of the sealing ring as to occupy a substantially radial position.

Abstract: An expansion joint sealing element, consisting of an arrow-shaped elastomer strip (1), defined by a triangular head (2) and a rear insertion section (3) with an angled end (4), while its lateral walls (5) are externally corrugated (6), an arrangement that is repeated on the external surface of the base (7) and on the lateral sections of the head (2), which, along with the insertion section (3), have various internal, longitudinal hollow sections defined by various interior walls (8), forming an insufflation chamber (9), so that one end of the strip (1) is closed off, while the other is fitted with a cover (10) and a valve (11), the latter being used to inject air so that the walls of the elastomer strip press against the adhesive applied to its lateral walls, where ridges considerably increase the area of adhesion and prevent the strip from moving while said adhesive cures.

Abstract: A circumferential seal for a disc filter valve to rotary collection pipe is formed by a radially compliant circumferentially restrained and tensioned seal disposed in a split "V" notch formed in a non-flooded zone between the stationary valve plate and the rotating collection pipe.

Abstract: A self aligning gasket having holes for passage of securing devices such as bolts, for joining parts together with the gasket positioned in between. A plurality of alignment pins are integrally attached to a fragile connective member to edges of a plurality of the holes formed through the gasket. The pins are installed through corresponding clearance holes in the parts to be joined. Once the parts are secured together, the pins are removed by breaking or cutting the fragile connective members, exposing the corresponding part clearance holes, making them available for their originally intended use.

Abstract: A spiral wound gasket having multiple windings of spirally wound strips of metal, fire resistant compressible filler material and oxidizer resistant compressible filler material is disclosed. The fire resistant filler material is arranged in a region toward the outside periphery of the gasket and the oxidizer resistant compressible material is arranged in a region radially closer to the inside periphery of the gasket. The gasket has excellent sealability characteristics from low to high gasket seating stresses, and is effective for use with corrosive chemicals while providing a measure of protection in fire situations.

Abstract: A packing system, for providing a seal around a valve stem, including a packing cartridge and a bushing. The packing cartridge includes a sleeve which has a tapered central passage. The sleeve also has external male threads and a hex head. Packing material is attached to the tapered central passage of the sleeve using an adhesive. The sleeve together with the packing material form the packing cartridge. The bushing also has a tapered central passage. The packing of the present invention is applied by sliding the bushing around the valve stem, and then sliding the packing cartridge around the valve stem. Once the bushing is seated in the stuffing-box of the valve, the sleeve is tightened down into the stuffing-box, thus squeezing the packing material and creating a seal around the valve stem.

Abstract: An multi-layered EMI gasket has a first layer constructed of an electrically conductive resilient material and a second, support layer of an electrically conductive material secured in facing engagement with the first layer. The material of the second layer is more rigid than the material of the first layer, so that the second layer imparts rigidity to the gasket. Preferably, the resilient material is carbon particle filled EPTFE and the support layer is a metal foil. The combination of these elements is very effective at conducting electrical signals, thereby providing exceptional EMI/RFI shielding of electronic components, while being far easier to handle and install than prior art gaskets. Further, the resilient material of the first layer permits the gasket to conform to irregular surfaces, thus providing an excellent environmental seal.

Abstract: The present invention relates to a sealing device, on tubular and/or circular tanks, for firing membrane valves, for cleaning sleeve filters, which comprises, inside a tubular and/or circular tank, a firing pipe, one end of which is connected to a membrane solenoid valve and the other end of which tightly projects from the tank. The device is characterized in that it comprises a fitting, connected to the firing pipe and including a recess for housing therein a sealing ring for providing a sealed coupling with the outer surface of the tank, as well as a sealing coupling surface for the solenoid valve. Moreover, a washer element is provided, which can be coupled to the other end of the firing pipe, and supports the sealing ring for providing a sealed connection between the firing pipe and the tank.

Abstract: A sealing assembly for sealing a clearance space between first and second members wherein the first member has a groove therein and the second member has a surface overlying the groove. The groove is defined by a base surface and two side surfaces. The first and second members are displaceable with respect to each other. The seal assembly includes a flexible generally annular sealing ring, generally T-shaped in cross section for being positioned within the groove. The ring has an axially extending leg intersecting a radially extending leg. The axially extending leg is for being positioned in engagement with the base surface of the groove. The radially extending leg includes converging side surfaces merging into converging end surfaces. The end surfaces are generally linear in cross section and merge into a generally arcuate transition surface when the ring is in an uncompressed state.

Abstract: An annular lubricant seal assembly for providing a seal between a shaft extending through a bore formed in a housing and the housing, wherein the shaft and the housing are rotatable relative to one another. The seal assembly includes an annular outer case, which is press fit into the bore, an annular inner case, and a spring member, the inner case being mounted on the shaft. Portions of the outer case extend adjacent to, but are spaced apart from portions of the inner case. An elastomeric seal member is secured to the outer case. Flexible lips formed on the seal member engage both axially and radially extending portions of the inner case disposed adjacent to the outer case. As a result, the seal member is capable of providing a secure seal against the shaft, even when the shaft moves axially or radially relative to the housing during use.

Abstract: In a turbine inclusive of:a turbine shaft having a longitudinal axis, a steam pipe, a shell circumadjacent the pipe, the pipe and shell being shiftable in vertical and transverse and axial directions relative to the longitudinal axis of the shaft, and a seal assembly disposed between the pipe and shell and comprising a stack of interdigitated relatively large and small piston rings, the improvement comprising: placement of the stack of large and small rings into a circular container which is inserted into the shell with adequate clearance to permit thermal expansion, the container being provided with a flexible seal to the shell and having thermal inertia similar to that of the rings and the pipe.

Abstract: The invention concerns a floating-ring seal in which the ring is disposed so that it can move freely inside an annular chamber. Of the four walls of the chamber enclosing the ring, two walls disposed at an angle to each other are stationary while the walls opposite them rotate at the speed of the drive. As a result of the freedom of motion of the floating ring and the drive and braking torques acting on it through the walls, the ring rotates at a speed which is lower than the speed of the rotating components.

Abstract: A seal for sealing between a bidirectionally rotating shaft rotatable in the forward and reverse directions and having a sealing surface thereon located in a pressurized housing containing the shaft. A seal ring mounted in the housing for movement toward and away from the shaft sealing surface and having a high pressure side, a low pressure side, a seal face opposed to the shaft seal surface and an outer face remote from the seal face and exposed to the pressure in the housing. Resilient elements urge the seal ring toward the sealing surface of the shaft. Hydrodynamic elements in the form of a plurality of spaced recesses in the seal face of the seal ring and formed so as to produce negative hydrodynamic lift in the recess and urge the seal ring toward the sealing surface of the rotating shaft during forward rotation thereof.

Abstract: An ultra high vacuum (UHV) joint is scaled by an elastomer O-ring (7) between adjacent flanges (3,4), fitting in a seal cavity formed by grooves (41,42) in the flange (3,4) surfaces. The groove surfaces (41,42) are highly polished and shaped such that the O-ring (7) conforms to the groove surfaces (41,42) and contacts them substantially entirely when the flanges (3,4) are clamped together. This improved structure significantly reduces the permeation through and the gas leakage around the seal (7). The resulting seal (7) can support a vacuum of 10.sup.-11 torr or better. The conformal-groove geometry of the present invention can be used with seals other than elastomer seals, such as soft metal seals (55,65).