Abstract: An improved device and method for plumbing a recirculating water pump into a hot water heating system, the water pump having a pair of connecting flanges on the inflow and outflow sides of the pump. The present invention includes a section of copper tubing which has one end flared, the flare preferably being at approximately right angles to the longitudinal axis of the tubing. Further, an installation flange is provided having a central hole and an inside face to be positioned against a corresponding face of a connecting flange of the recirculating water pump, the copper tubing being inserted through the central hole of the installation flange with the flared end positioned against the inside face of the installation flange. A flexible gasket, having a central opening, being positioned between the installation flange and the connecting flange of the recirculating pump. The installation flange and flexible gasket being connected to the connecting flange of the recirculating pump with bolts.

Abstract: A three-piece combination spacer and shim assembly is provided for an air operated diaphragm pump. The spacer/shim assembly is disposed between adjacent parts of the manifold assemblies of the pumps to alleviate dimensional stack up and misalignment problems associated with the manifold assemblies of air operated diaphragm pumps. The assemblies provide a seal between the spacer component and the adjoining flanges of the manifold components.

Abstract: A single piece seal that functions both as a seal and a spring. The single piece seal includes a central bore for receiving a communication line such as a wire or a fiber optic cable. The single piece seal also includes a first and second radial sealing ring, and at least a first axial compression portion between the first and second rings. Preferably the seal includes a second and third compression portions each extending from an outer edge of the first and second rings respectively. Each of the rings may have and radial thickness which is 25% or more greater than the radial thickness of the first axial compression portion, and each of the rings may have an axial length which is 50% or more of the axial length of the first axial compression portion. Preferably the second and third compression portions have an axial length which is at least twice that of either of the rings. Each end of the seal have tapered counter bores communicating with the central bore.

Abstract: A creep resistant article is provided which is dimensioned from a stock material consisting essentially of a plurality of layers of expanded polytetrafluoroethylene which has been densified. The expanded polytetrafluoroethylene exhibits remnants of a fibril and node structure. The article is resistant to creep at high temperatures and under high loads.

Abstract: A coupling for sealing a leak location in a pipe or pipeline by compressing against the pipe or pipeline a pair of annular gasket members fitted about the pipe or pipeline on opposite sides of the leak location comprising a first axial sealing pad disposed in a recess in an annular coupling member and a second axial sealing pad attached to a sealing plate which extends across an axial split in the coupling. The first and second axial sealing pads form an axial seal when the coupling is closed about a pipe or pipeline for preventing passage of fluid from between the annular gasket members to the outer surface of the coupling member through the axial split. The annular coupling member of the coupling has an axial split defined by first and second axial edges and comprises a first portion extending from the first axial edge to an axial shoulder which extends outwardly to a second portion.

Abstract: A gasket assembly is provided for fluid couplings. The gasket assembly includes a gasket having an outer circumferential surface including arc segments defining a minor outside diameter and a plurality of ears projecting outwardly from the arc segments to define a major outside diameter for the gasket. The gasket assembly further includes a split cylindrical sleeve having a plurality of slots disposed and dimensioned for loosely receiving the ears of the gasket. The sleeve and the gasket are dimensioned such that the ears project outwardly beyond the tube to define gripping protrusions that facilitate mounting and removal of the gasket assembly onto the coupling component.

Abstract: A multi-ring gasket (24) and flanged pipe joint assembly employing such gasket. The gasket (24) for sealing the joint between two flanged pipes of polyvinylchloride, chlorinated polyvinylchloride or fiberglass-reinforced plastic pipe is provided. The gasket (24) has an inner ring (26), an outer ring (28) and a plurality of spokes (30) connecting the inner ring (26) to the outer ring (28). Voids (34), or reduced thickness areas, are formed between the inner ring, the outer ring and the spokes so as to leave substantial space between the flanges at the voids and thereby reduce the uneven distribution of stress on the flanges when the gasket (24) is installed. The joint assembly employing such gasket (24) has a groove (50) disposed in an inside surface of a flange (12 or 16) and has a channel (51) disposed through the flange. The channel (51) is in communication with the groove (50) and, by means of a port (56), an outside surface of the flange.

Abstract: A device for joining the end of a helically corrugated metal tube to a connector or a second helically corrugated metal tube includes a back-up ring, pressure ring and a sealing ring. The connector is provided with a conical transition and an expanded diameter. The second helically corrugated tube is provided with a second back-up ring and pressure ring.

Abstract: A coupling joint, arranged to join a first element having a substantially circular internal envelope surface with a second element, inserted into the first element and having a smaller external diameter than the internal diameter of the first element. The coupling joint includes a helically wound, and in longitudinal direction, corrugated or creased strip-shaped intermediate member, which is located in an intermediate position between the first and the second element. An expanding or clamping joint, applied against the first or second element causes same to be pressed against the intermediate member causing same to be compressed or pressed against adjacent envelope surfaces of the elements. The side edge portions of the intermediate member are preferably arranged extending towards one and same element, and engage with the element when the intermediate member is compressed or pressed.

Abstract: A pipe joint is disclosed, along with a pipe for use with such a joint. The pipe has a double wall construction with support ribs connecting the two walls of the pipe. The pipe also includes at least one end wall having a routed groove formed therein, wherein the groove is dimensioned to receive a coupling member. A locking entrance lip is formed within the groove. The pipe joint includes two pipe sections and a coupling member that is received into the respective grooves of each pipe section and is locked into place by the locking entrance lips. The joint is fluid tight, locks the pipe sections in place, and is smooth on both the interior and exterior surfaces of the two connected pipes. In addition, the disclosed pipe joint construction is very easy to assemble, and is particularly suited for use in sewer relining operations.

Abstract: A coupling member includes a ring is formed with a predetermined draft angle. A gasket is provided for creating a seal between the ring and the end grooves of the conduit. The gasket comprises first and second walls which define an interior cavity for receiving the ring. The first and second walls have differential thicknesses so as to accommodate the draft angle of the ring. A plurality of fins are formed integrally on the exterior of the gasket for creating an interference fit with the end grooves.In the preferred embodiment, the first wall is substantially thicker than the second wall and the fins exterior to the first wall are thicker than the fins on the second wall. Also, the thicknesses of the first and second walls are preferably tapered so as to define an interior cavity having a draft angle equal to that of the ring.

Abstract: A joint seal has a through bore and two spherical spaced convex surfaces which mate with respective concave spherical surfaces on a pair of adjacent flanges. The flanges are welded to and about the periphery of corresponding spaced pipes one of which is inserted in the bore of the seal. The flanges are joined by two bolts, one flange being fixedly secured to the bolts and the other resiliently movably secured to the bolts by a pair of springs to permit that other flange to rotate in response to rotation of the pipe affixed thereto. The one flange forms a static wedge-like seal joint with one of the pipes and the other flange a dynamic seal joint with the respective seal spherical surfaces, the spherical seal and flange surfaces being urged together in wedged relation by the springs.

Abstract: The invention relates to a device for butt joining of ducts for carrying gaseous medium, the ducts having a rectangular or square cross section, wherein a profile is fixed along the free end edges of a duct, which profile comprises: an end wall standing perpendicularly on the duct wall; a flange for fixing the duct wall, a hook-shaped member the legs of which extend along the rear side of the end wall of the profile, such that at least the mutually facing front sides of two mutually opposite hook-shaped members of ducts to be connected can be fixed to each other, and wherein a deformable sealing means is arranged on the rear side of the hook-shaped member facing toward the duct wall.

Abstract: A gasket assembly is provided for fluid couplings. The gasket assembly includes a gasket having an outer circumferential surface including arc segments defining a minor outside diameter and a plurality of ears projecting outwardly from the arc segments to define a major outside diameter for the gasket. The gasket assembly further includes a split cylindrical sleeve having a plurality of slots disposed and dimensioned for loosely receiving the ears of the gasket. The sleeve and the gasket are dimensioned such that the ears project outwardly beyond the tube to define gripping protrusions that facilitate mounting and removal of the gasket assembly onto the coupling component.

Abstract: The invention relates to a socket joint for plastic pipes, whereupon a spigot end (1a) of one (1) of the pipes to be connected is inserted in an expanded section (2a) of a socket (2), and an intermediate space (3) situated between the spigot end and the expanded section comprises a housing sealing unit (4) that extends along a considerable part of the length of said intermediate space and that comprises several circular flexible lip seals (6) on its outer and inner circumference. The outer and inner circumference of the sealing unit (4) also comprise several circular support seals (7) which have a substantially smaller compressibility especially in the radial direction than the lip seals (6).

Abstract: A gasket able to ensure static imperviousness between two parts one being fixed with respect to the other and possibly having surface irregularities and forming a joint housing which is not easily accessible.It generally has a flexible strip (2) formed by two elements (2I, 2E) each having one extremity (7I, 7E). The mechanical behavior of the gasket is ensured by a wire core (3), such a helical spring possibly surrounded by an internal casing (4). An external rigid casing formed of two portions (5E, 5I) advantageously completes this gasket while leaving the extremities (7E, 7I) free.

Abstract: A device for sealing a space between an annular wall defining an opening and a pipe end portion introduced into the opening consists of a sleeve (2) having at one end thereof a flange (4) for restricting the introduction of the sleeve into the opening and having at its other end a flange (6) for restricting the introduction of the pipe end portion into the sleeve.

Abstract: A corrugated spiral pipe with a joint is formed by the steps of winding a seal material on thread portions of a pipe end of a spiral pipe, fitting a part of a cylindrical joint body to the pipe end so as to cover a portion on which the seal material has been wound, injecting a liquid foamable resin material through an injection hole and letting it foam, and filling a trough portion of the spiral pipe with the foamed resin material so as to make the spiral pipe watertight for coupling purposes. When the spiral pipe with the joint is coupled to another spiral pipe, a waterstop is forced into a trough portion of a pipe end portion of the latter pipe, an elastic seal ring is fitted onto an outer peripheral face of the latter pipe, and the pipe end of the latter pipe is forced into an outward protruded portion of the joint body.

Abstract: A technique for joining a larger and a smaller pipe wherein the smaller pipe has an outside diameter smaller than the inside diameter of the larger pipe. An inner and an outer gasket are used to form the joint. The inner gasket has an inclined outer surface forming a wedge shaped profile and is stretch fitted over the smaller pipe. The outer gasket has a portion of its inner surface matched to the inner gasket outer surface and is compression fitted into the inner surface of the larger pipe whereby the portion of the smaller pipe having the inner gasket is encased by the larger pipe. The smaller pipe is then pulled away from the larger pipe until the inner gasket wedges against the outer gasket forming a locked sealed joint.

Abstract: An improved insertable member is provided suitable for use as a seal monitoring gasket. In one embodiment, the insertable member employs an embedded electrically conductive element responsive to stresses placed upon it. When fatigue or a break occurs along the member body, changes in the electrical transmission properties of the conductive element provides data warning of changes or risks to the seal between component parts. The insertable member can include different conductive elements providing changes in signal from a variety of stresses which may be placed upon it, including tension, pressure, and/or temperature. Additionally, by forming the insertable member and/or the conductive element from material which will undergo changes in electrical properties upon compression, the insertable member can also provide feedback of the amount of constriction between component parts for proper installation and maintenance.

Abstract: A quick connect coupling for tubing. The coupling includes a tubular male connector member adapted to be telescopically received within a tubular female connector member assembly. The female assembly includes a first member defining a seal bore and a cylindrical socket portion forwardly of the seal bore. A second female member includes a cylindrical portion which plugs into the socket of the first member and is held in position relative to the first member by sonic welding. A plurality of circumferentially spaced feet on the inner end of the second member are positioned proximate the seal to hold the seal in the seal bore and further engage the outer periphery of the pilot portion of the male member to minimize cocking of the male member relative to the female assembly.

Abstract: A duct coupling pad for joining flexible ducts includes an outer section surrounding a central opening. An adhesive coating is applied to one surface of the coupling pad for adhering the pad to a first one of the ducts to be joined. An opening is formed in the first duct within the area of the central opening of the coupling pad. Securing tabs integrally formed with the outer section of the coupling pad are folded inwardly into the opening in the first duct and adhered to the inner surface thereof. The coupling pad binds the edge of the opening in the first duct to prevent splitting and tearing of the linings. A collar is inserted into the central opening of the coupling pad and the second duct is connected to the collar.

Abstract: A joint for mating exhaust pipes includes an exhaust pipe flange gasket with a metallic body having a planar portion extending laterally inwardly from an outer edge of the body, the planar portion having at least one bolt hole, and a shielding grommet integrally connected to an inner edge of the planar portion. The shielding grommet defines an outer periphery of an aperture, and a sealing element is retained within the grommet. The gasket is disposed between two mating exhaust pipes each pipe having a flange with an aperture and a planar clamping face, at least one of the flanges including a recess adjacent the clamping face. The planar portion of the gasket is disposed between the faces such that when the apertures of the members are aligned with the bolt hole, the shielding grommet is received in the recess.

Abstract: A quick connect coupling including a tubular male connector member and a female connector assembly. The male connector member is tubular and defines a front pilot portion and an external bead positioned rearwardly of the pilot portion. The female assembly comprises a tubular housing, a cap which is snap fit over the front end of the housing, a seal which seats in a seal bore defined by the housing, and a seal retainer which is positioned against the front end of the housing and acts to maintain the seal in position within the seal bore.

Abstract: A joint which comprises a first joint component having an axial aperture and a second joint component having an axial aperture arranged coaxially with the aperture in the first joint component. The joint components have a gasket ring interposed therebetween to act as a fluid seal. The components are joined by bolts and within the gasket ring are a number of stress or strain responsive elements equispaced around the entire periphery of the gasket ring, each comprising a pair of electrodes sandwiching a stress or strain responsive material. The responsive elements have opposed faces which are spaced from the opposed faces of the gasket ring and the electrodes and are connected to an output via leads to give an indication of the stress or strain within each individual element corresponding to the torque force applied to a proximate bolt.

Abstract: A gasket for use with exhaust systems having at least one header flange and an exhaust pipe flange joined thereto. The gasket includes an inner annular sealing ring like member deformable under pressure mounted on an outer annular metal retainer ring sized to be mounted at a flange junction between said header flange and said exhaust pipe flange. The inner ring has an outside diameter slightly greater than the inside diameter of the inner ring to deformably support the inner ring on the outer ring. The outer ring inside diameter is greater than the inner diameter of the flange junction to permit the inner ring to be compressed upon forming the junction. The inner ring is formed from a non-asbestos fiber fused with spiral wound metal wire. It is preferred that the non-asbestos fiber is an aramid fiber and the spiral wound metal wire is stainless steel. The thickness of the inner ring is at least twice as thick as the thickness of the outer ring.

Abstract: A water pipe connecting structure composed of a hexagonal locking nut, a coupling pipe, a connecting pipe, a metal fastening sleeve and a conic watertight washer. The locking nut has an inner flange at one end. The coupling pipe is divided by an expansion neck portion into an upper head portion and a lower binding portion formed with several slideproof check rings. The coupling pipe is fitted into the locking nut with the expansion neck abutting against the inner flange of the locking nut and with the binding portion extending through the inner flange to insert into the fastening sleeve fitted with one end of the connecting pipe. The fastening sleeve receiving the binding portion is rolled and pressed so as to bind therewith. An outer flange is formed at a top end of the head portion of the coupling pipe. The outer flange has an inclined outer periphery for engaging with the washer and preventing the same from dropping out.

Abstract: A waterproof coupling between at least one tube and at least one endpiece by means of a molded portion secured to the tube and providing means that provide sealing between the tube and the endpieces, wherein said portion which is made of a material of the elastomer type or of a material having analogous properties, and that has been vulcanized or cross-linked after molding, is also secured, after vulcanization or cross-linking, to a ring or sleeve by means of which the tube is suitable for being assembled to the endpiece.

Abstract: A fast tube connector structure including a tube connector, a rubber fastening washer, a guiding sleeve, a conic spring washer and a sleeve-like nut, wherein a tube is inserted through the nut into a space defined by the spring washer, guiding sleeve and fastening washer and located on a tube seat of the tube connector. The nut is then secured onto the tube connector, forcing the spring washer to move downward and causing a narrow end thereof to move downward along an inclined guiding flange. The claw portion is thus compresses by the guiding flange to tightly clamp and fasten the tube and firmly fictionally associate the tube with the tube connector.

Abstract: A safety shield for capturing corrosive fluids escaping from joints or valves in piping systems consists of first and second shroud members releasably joined together to form an enclosed chamber in assembled position about the joint or valve. The chamber includes at least one aperture which is sized and shaped for mating engagement around the pipe. Corrosion resistant gasket members interposed between the first and second shroud members and between the pipe and the at least one aperture render the enclosed chamber vapor tight in the assembled position. The chamber may further include at least one other aperture sized and shaped to receive the operating stem of the valve therethrough, and a corrosion resistant gasket interposed between the valve stem and the at least one other aperture for forming a vapor tight seal without interfering with the operation of the valve.

Abstract: A pipe coupling comprises an annular sleeve member arranged in use at a free end thereof to overly an end of a plain ended pipe to be connected by the coupling, the free end of the sleeve member being inclined radially outwardly towards its end; an elastomeric annular sealing gasket disposed at least partly within the inclined free end of the sleeve member and held in place by an annular compression flange member; the compression flange having a skirt portion, axially outwardly, and an axially inwardly extending collar portion radially outwardly overlying the free end of the sleeve member; the gasket including, when in a relaxed condition, an axially outwardly directed rear surface arranged in use to engage an axially inwardly directed face of the annular radially inwardly extending portion of the flange member, a radially inner surface extending generally axially inwardly of the coupling from a gasket heel to a gasket toe, and an inclined surface extending generally between the two above mentioned surfaces o

Abstract: Assembly is described for providing a radial seal between two air conduit members. The assembly generally comprises a first conduit member having seal retainer thereon and, second conduit member having a tubular section which is inserted into the seal retainer, during formation of the radial seal. The seal retainer comprises a retainer trough having a removable and replaceable seal ring positioned therein.

Abstract: A coupling assembly for fluid carrying tubes in a gas turbine engine include first and second fittings fixedly joined to respective ones of the tubes. The first and second fittings include respective first and second mating flanges which are joined together by a clamping band which is adjustable therearound. The first and second flanges include oppositely facing first and second flat faces, with the first flange having a counterbore extending inwardly from the first face, and the second flange having a pilot tube extending outwardly therefrom for being inserted into the counterbore. An annular seal is disposed between the first and second fittings for providing a leak-proof coupling upon clamping together of the two fittings by the clamping band.

Abstract: A quick connect coupling for tubing. The coupling includes a tubular male connector member adapted to be telescopically received within a tubular female connector member. The female connector member includes a tubular housing and a tubular retainer cap which is permanently bonded to the housing utilizing a sonic welding technique and which defines prong portions for latching coaction with an annular bead on the male member. The coupling further includes a unitary elastomeric seal positioned in a bore of the female member housing and defining a series of axially spaced, radially inwardly extending seal ribs slidably and sealingly engaging the outer circumferential surface of the male connector member.

Abstract: A vortex gasket for automotive exhaust system, preferably used with a special flange having a conical seal surface, is formed by spirally overlaying a metal hoop (2) of flat strip, and an inorganic filler (3) of tape form, and annularly spot welding a winding start portion (2a) and a winding end portion (2b) of the hoop (2) to itself. The tape form of the inorganic filler is wider than the flat strip of the metal hoop so that edges of the inorganic filler form seal contact surfaces spaced beyond edges of the metal hoop. When an external force is applied in the axial direction, slipping occurs between the hoop (2) and the filler (3), and the gasket is telescopically deformed in the axial direction, so that the seal contact surfaces 1a, 1b, at sides of the gasket, are formed in a conical shape.

Abstract: A gasket for a claw or clamp quick-connection coupling, the gasket being constituted by a circularly symmetrical annular body defined by two parallel radial faces, an outer cylindrical surface surmounted by a partially toroidal bulge centered on the midplane of the gasket parallel to the radial faces, a partially toroidal inner surface also centered on the midplane, and connected to each of the radial faces via a respective chamfer-forming conical surface.

Abstract: An inventive tubing connector includes a tube (22) having an upset portion (24) receiving within a housing (26). a retainer (30) is positioned between an outer end of the housing and the upset portion to prevent tube removal. A seal (48) within the housing provides a fluid tight seal between the housing and the tube. The seal is preferably formed of toughened fluorosilicone, such that it provides a secure fluid tight seal over a temperature range down to about -50.degree. below zero.

Abstract: A rapid-action coupling device for making a sealed connection between two rigid or semi-rigid tubes or pipes includes a gasket constituted by a sleeve having latching means at one of its ends for co-operating with spring blades fixed on a tube or pipe, the spring blades including latching means suitable for co-operating with the outside surface or with a collar on the other tube or pipe.

Abstract: A length of corrugated tubing is (B) inserted into a bell (C) having an open end 42. The corrugated tubing is defined by alternating annular portions peak (22) and valley portions (24) and a cylindrical inner wall (26) connected with an inner surface of the valley portions. Annular chambers (28) are defined between the cylindrical inner liner and each peak portion. The bell has a stop (10) and a cylindrical side wall (40) with a groove (44) for receiving a gasket (30) that is disposed in one of the tubing valleys. The groove is constructed an integer number of peak and valley portions from the stop such that the gasket aligns with the groove when an end of the tubing length abuts the stop. A plurality of latch elements (60) are disposed an integer number of peak and valley portions from the gasket receiving groove toward the bell open end. The latch elements extend into another of the valley portions and engage a corrugation side wall to transfer axial uncoupling forced from the tubing to the bell side wall.

Abstract: A multi-piece, pipe joint seal has a slidable interface between seal pieces. The slidable interface allows for slippage between pieces during pipe joint assembly and disassembly, minimizing rotational and other stresses on the seal pieces and pipe sealing surfaces which may damage or endanger the deformable seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids.

Abstract: A suction pipe coupling mechanism for vacuum cleaners in which the coupling mechanism is provided with a joint pipe on one of two suction pipes to be coupled with each other. The joint pipe is formed in a size suitable for insertion into the opening at the connecting end of the other or second suction pipe and has an elastic sealing member to be expanded radially outward against the inner periphery of the connecting end of the second suction pipe.

Abstract: The sections of concrete tubes or rings are connected end to end by means of a joint, and, in order to prevent aggregates and other undesirable materials to penetrate into the joint when a space is formed in the latter following climate modifications or other disturbances, there is disposed at the level of the joint, a ring of flexible material, which includes a flange made to remain pressed against the joint and to cover the latter permanently even if a space is produced in the joint. This ring is preferably fixed at one of the sections of tube and this ring may even be made of two interconnecting members.

Abstract: A gasket for use on a exhaust connection between an exhaust manifold and an exhaust pipe includes a spherical sealing portion which mates with sealing portions on both the exhaust manifold and the exhaust pipe. The spherical-to-spherical-to-spherical contact allows adjustment between the various sealing surfaces, while maintaining an adequate seal. Interference fits are utilized to secure the gasket to one of the exhaust manifold and exhaust pipe. Further, a method of forming the gasket involves first drawing a sheet into the general shape, and then punching all required openings in the gasket shape.

Abstract: A profile gasket adapted for forming a seal in a joint between an annular band and annularly grooved ends of two pipes positioned end-to-end. The profile gasket comprises a sheet of elastomeric material having a bottom surface with at least two integrally molded and laterally spaced ridges running along its length.

Abstract: A pipe coupling wherein the axial split is offset from the location wherein the coupling is closed. The offset increases the resistance of the pipe coupling to lifting forces exerted by pressurized fluid in pipes or pipelines. In addition, an extension member and a reinforcing member on the opposite sides of the closure device increase the section modulus of the pipe coupling and further increase the resistance of the pipe coupling to lifting forces.

Abstract: The disclosure relates to a threaded member having an annular groove which is of greater depth than the base of the adjacent thread. A resilient ring is mounted in the groove having an outer periphery extending above the base of the thread and a plurality of projections are formed at spaced locations around the ring to be deformed by the engagement of the threaded member with a corresponding threaded member to form a seal between the respective threads of the engaging members.

Abstract: A split fitting for coupling two tubes, one having a large diameter, one having a small diameter, the fitting having mating first and second halves for surrounding the connection point between the larger and smaller tubes and forming a threaded neck portion for threading engagement with a nut slipped over an end of the larger tube for actuating a compression fitting to seal between the fitting and the larger tube. An O-ring seal is provided within the split fitting for sealing the fitting to the smaller diameter tube when assembled. The fitting halves are coupled together using captive screws and alignment pins.

Abstract: A one-piece pipe coupling includes a cylinder with an axial joint and a sealing plate attached in spaced apart relation to the inner surface of the cylinder with a portion of the sealing plate extending beyond the axial joint for sealing the fluid pathways between a leak location and the outer surface of the coupling. A pair of arcuate gaskets extend around and are attached to the inner surface of the cylinder. The sealing plate carries a first sealing pad on the extending portion of its outer surface, which sealing pad includes circumferential guide channels for engaging the arcuate gaskets of the cylinder. The sealing plate also carries a second sealing pad on the other end of its outer surface, which sealing pad attaches the sealing plate in spaced apart relation to the inner surface of the cylinder.

Abstract: A multi-ring gasket and flanged pipe joint assembly. A gasket for sealing the joint between two flanged pipes of polyvinylchloride, chlorinated polyvinylchloride or fiberglass-reinforced plastic pipe is provided. The gasket has an inner ring, an outer ring and a plurality of spokes connecting the inner ring to the outer ring. Voids, or reduced thickness areas, are formed between the inner ring, the outer ring and the spokes so as to leave substantial space between the flanges at the voids and thereby reduce the uneven distribution of stress on the flanges when the gasket is installed.

Abstract: A pipe joint and coupling construction particularly suited for joining large diameter plastic pipe as used in sewer relining. The construction comprises first and second sections of cylindrical pipe having axially aligned opposed end walls with a continuous groove formed in each end wall. The groove in each end wall is axially aligned with the groove in the opposed end wall and cooperates therewith to form a gasket receiving chamber. The coupling member is adapted to be mounted in the gasket receiving chamber for sealingly joining the pipe sections. It comprises a rigid annular core ring for mounting in the chamber to extend axially into each of the axially aligned grooves. A resilient compressible elastomeric covering is positioned over the core ring and carried circumferentially continuous radially extending protrusions which are sized to be sealingly compressed between the core ring and the side walls of the grooves.