Abstract: A method and apparatus for restraining pipe against both internal and external forces at a pipe or fitting connection and to join and seal at least two pipes to form a pipeline is shown featuring an improved restraining and sealing mechanism. The restraining and sealing mechanism includes a circumferential housing and a companion sealing ring which are received within a mating groove provided in the belled end of a female pipe. The circumferential housing has an interior region which contains a gripping ring insert. The sealing ring and housing are integrally located within a belled pipe end during belling operations.

Abstract: A connection system for conduits, fittings or assemblies which are intended for carrying a fluid acted upon by a pressure (p1), in particular for systems carrying carbon dioxide. The connection system comprises a first coupling part such as a housing part, a second coupling part such as a plug part, and is capable of being introduced into the first coupling part along an axis. At least one gas-permeable circumferential seal is arranged in a groove in one of the two coupling parts. One coupling part is capable of being plugged with a shank into a round receiving orifice of the other coupling part. After plugging-in, the circumferential seal seals off a gap between the outer radius of the shank and the inner radius of the receiving orifice.

Abstract: A novel design for the connection of polyvinyl chloride (PVC) casing. Each length of casing has a male end and a female end. The female end has a narrowing interior diameter with its wider interior diameter at its outermost end sufficient to receive the male end of similar length of casing for connection. The diameter of the female end narrows to a diameter which is less than the outer diameter of the male end. The male end has a lip at its leading edge and is slotted and compressible when forced through the narrowed diameter of the female end. A groove in the interior surface of the female end is sufficient to receive the lip at the leading edge of the male end. When the lip at the leading edge of the male end reaches the groove, it allows the compressed male end to expand with the groove receiving the lip therein. The connected lengths of casing are locked together in this manner.

Abstract: A positive fit feed adapter for use between a paintball loader and a paintball gun. The feed adapter includes a threaded connector formed on either the paintball gun or the paintball loader. The threaded connector includes a plurality of expansion slots that allow the outer diameter of the connector to expand or compress. The feed adapter further includes a collet having an internally threaded surface that is tapered from a first end to a second end. When the feed tube from the other of the paintball gun and the paintball loader is inserted into the threaded connector, the collet is tightened along the external threads to reduce the diameter of the connector to provide a positive fit between the paintball gun and the paintball loader.

Abstract: A twin-wall pipe comprises an internal pipe and an external pipe. The external pipe is corrugated, having elevations and troughs. The twin-wall pipe is further provided with a socket. In a transition portion towards the twin-wall pipe and the socket, provision is made for at least one overflow passage which interconnects the clearance between the external pipe and internal pipe in the vicinity of the transition portion and an adjacent elevation.

Abstract: The present disclosure relates to a sealing element for a pressed connection that includes an essentially ring-shaped body constructed of elastic material. Also included is at least one sealing edge formed on an interior side and an exterior side of the ring-shaped body. At least one cutting element is embedded in the ring-shaped body and has a cutting edge. The cutting edge is configured to be moved out of the ring-shaped body during a pressing-together of the pressed connection. The present disclosure further relates to a pressed connection for plumbing fixtures. The pressed connection includes a connection piece adapted to have a receiving device constructed therein and configured to receive a pipe end. The connection device is further configured to be pressed together into the pressed connection. Further included is a sealing element arranged in the receiving device, the sealing element comprised as described above.

Abstract: A connection device for fitting to a member, particularly to a corrugated flexible pipe (146, 246, 446) formed with a series of spaced annular grooves, the device comprising first and second tubular bodies (10, 11) coupled together, in use, with the pipe received in an open end of the first body (10). The first body has a plurality of resilient lugs (14) with respective inwardly directed projections (17) at the ends thereof to be received in one of the said grooves to grip the pipe. The two bodies can be relatively angularly moved between a neutral position of the device, where the pipe is retained by the resilience alone of the lugs, an unlocked position, where the lugs are released from the pipe, and a locked position, where the lugs are forced into locking engagement with the pipe, movement of the lugs being controlled by cam formations (29) extending from the end surface of the second body (11).

Abstract: An annular beveled insert for enhancing the insertion of a plain end of a pipe into a mating belled end of a pipe, the insert including an annular main body portion having a substantially flat surface and a beveled opposed surface. The annular main body portion has inner and outer diameters approximately equal to inner and outer diameters, respectively, of the plain end of the pipe. An outwardly directed flange extends from the annular main body portion around a periphery and has an outer diameter greater than the outer diameter of the plain end of the pipe. The flange is sufficiently flexible so that it bends into an angle of approximately ninety degrees with the flat surface of the annular main body portion and aids the main body portion in masking the plain end of the pipe as it passes through the annular gasket.

Abstract: A piping joint structure includes a first piping member, a second piping member having at least a window portion, and a joint member provided with a body unit and multiple engagement units, which protrude to the central axis side of the body unit and are capable of being diameter-enlarged and diameter-shortened. The body unit of the joint member has a semi-crack shape. The joint member hoops the second piping member from a periphery side of the second piping member, while the engagement units are inserted through the window portion. The first piping member is connected to the second piping member by a one-touch operation of diameter-enlarging and diameter-shortening of the engagement units.

Abstract: A sealing and restraining gasket for preventing separation of a pipe joint used to join a bell end of a female pipe to the male end of a mating pipe. The gasket is formed from a compressible body of elastomeric material and carries a rigid ring with gripping teeth for engaging an outer surface of the mating male pipe. The ring has a gap at one location. The gripping teeth of the rigid ring are oriented so as to be out of contact with and initially angled away from the outer surface of the male plastic pipe. The teeth are forced into engagement with the exterior surface of the male pipe as the pipe joint is assembled and the gap in the ring is partly closed. The teeth are oriented to allow movement of the male pipe in a first direction relative to the female bell end opening during assembly, but to resist movement in a opposite direction after the pipe joint has been assembled.

Abstract: A coupling for joining pipe segments together is disclosed. The coupling is derived from a standard fitting and has a housing with a socket and a first expanded region adjacent to the socket, a second expanded region adjacent to the first expanded region and a third expanded region adjacent to the second. A sealing member is positioned in the first expanded region, a retainer is positioned in the second expanded region and a support washer having transversely oriented radial and coaxial flanges is positioned adjacent to the retainer in the third expanded region. A lip turned inwardly on the second expanded region overlaps the radial flange and captures the support washer, retainer and sealing member within the coupling. The retainer has a plurality of radial teeth angularly oriented to engage a pipe and prevent its removal from the coupling.

Abstract: A fuel communicating assembly including a base having a wall disposed about a longitudinal axis. The wall having a surface exposed to the longitudinal axis. The surface defining a chamber. The wall having an end that defines an aperture to the chamber. The assembly further including a component having a housing. The housing having an exterior surface. A portion of the exterior surface disposed within the chamber. A metallic member having an inner surface and an outer surface contiguous with the exterior surface of the component. The outer surface is contiguous with the surface of the wall so that the portion of the exterior surface of the component is retained within the chamber and the aperture of the chamber is hermetically sealed. A method of retaining a component within a base is also described.

Abstract: A pipe joint includes at least a first and a second pipe. A section of the first pipe is opened out and a further section of the second pipe is inserted into the section, so that both pipes overlap in an overlap region. A gap is formed between the section and the further section, into which gap a free-flowing sealing medium can be introduced via an input passage. In the method, a first and a second pipe are fitted together, a sealing medium is introduced into the gap between the pipes via an input passage, air located in the gap escaping via at least one output passage, and the input passage and the output passage are closed. The sealing medium, preferably an epoxy-resin/glass-fiber mixture, ensures especially effective sealing of the pipe joint and also an especially stable frictional connection between the pipes.

Abstract: A connector for connection of a pipe end portion of coiled tubing adapted for connecting a piece of downhole equipment. The connector is formed by three separate parts that can be screwed together two and two, of which a radially inner shrinkable adapter sleeve compressively surrounded by an elongate outer adapter and connector sleeve ensures the securing of the end portion of the coiled tubing, whereas a freely projecting, internally threaded end portion of the outer sleeve ensures the connection to the remaining part of the connector in the screwing together. The connector, besides exhibiting improved tensile, flexural and compressive strength properties, is also well suited to absorb torques applied.

Abstract: A pipe joint between cylindrical male and female couplers having terminal end portions with cooperating cam surfaces that facilitate assembly of the couplers. Cooperating projections on the couplers cam past one another when the couplers are assembled and restrain the couplers against separation. A gasket is interposed between the couplers, and the couplers are articulatable at least several degrees to permit some curvature to a string of pipe. The couplers have splines received in annular sockets in the ends of pipes, and the sockets are filled with adhesive to retain the splines therein. The gasket is prelubricated and protected by a plastic wrap that also provides protection against ultraviolet rays. Cylindrical ring couplers are formed by extruding a strip having a coupler cross-sectional profile, cutting a length of the strip and fusing the ends at a joint.

Abstract: A device for gripping the external wall surface of a pipe or bar. The device includes a tubular body having at least one end open for insertion of a pipe or bar, and a cage with balls or rollers cooperating with a first tapered internal wall part of the body. A resilient mechanism pushes the cage in an axial direction to cause the balls or rollers to grip the external wall of an inserted pipe or bar. The device also has a compressible member located within the body and cooperating with a second tapered inner wall part of the body and movable relative thereto when increased fluid pressure is present within the body. Under increased pressure it also grips the external wall of the inserted pipe or bar.

Abstract: A pipe coupling is shown for coupling adjacent ends of a pair of pipe sections where one of the pipe sections is formed of a polyolefin and the other pipe section is formed of a different material. The coupling includes an adapter formed of a length of pipe having a polyolefin pipe wall, the adapter having a fusing end for fusing to a successive length of polyolefin pipe and a coupling end. The coupling end has an integral flange which defines a bell end opening for the adapter. The bell end opening has a first region of reduced internal diameter for receiving a sealing gasket. The bell end opening also has a second region of further reduced internal diameter which forms a circumferential shoulder region therein for receiving a male spigot end of a mating pipe which is formed of the different material.

Abstract: A toilet carrier for supporting a wall-hung toilet can include a smooth pipe nipple that attaches a toilet to a waste pipe. A seal can be formed with the pipe nipple at the waste pipe end using a gasket compression seal, where a gasket is compressed between two opposing flanges encircling the pipe nipple, forcing a seal to be formed with the pipe nipple.

Abstract: A restraining element for preventing separation of a pipe joint used to join a bell end of a female plastic pipe to the male end of a mating pipe. The restraining element is formed from a compressible body of elastomeric material, the compressible body having a segmented metal ring located therein with gripping teeth for engaging an outer surface of the mating male pipe. The ring segments making up the segmented metal ring are oriented such that the gripping teeth of the ring segments are out of contact with and initially angled away from the outer surface of the male plastic pipe. The teeth of the annular gasket are forced into engagement with the exterior surface of the male plastic pipe as the pipe joint is assembled. The teeth are oriented to allow movement of the male pipe in a first direction relative to the female bell end opening during assembly, but to resist movement in a opposite direction after the pipe joint has been assembled.

Abstract: A pipe fitting includes a body having sockets for receiving pipes therein and a composite gasket housed within a circumferential gasket retention housing integral with the socket. The composite gaskets include a V-shaped carrier of relatively stiff plastic having an elastomeric seal portion bonded thereto.

Abstract: A restraining element for preventing separation of a pipe joint used to join a bell end of a female plastic pipe to the male end of a mating pipe. The restraining element is formed from a compressible body of elastomeric material, the compressible body having a segmented metal ring located therein with gripping teeth for engaging an outer surface of the mating male pipe. The ring segments making up the segmented metal ring are oriented such that the gripping teeth of the ring segments are out of contact with and initially angled away from the outer surface of the male plastic pipe. The teeth of the annular gasket are forced into engagement with the exterior surface of the male plastic pipe as the pipe joint is assembled. The teeth are oriented to allow movement of the male pipe in a first direction relative to the female bell end opening during assembly, but to resist movement in a opposite direction after the pipe joint has been assembled.

Abstract: An improved joining assembly employs a retainer ring member to hold in place a gasket member in a pipe or fitting. A resilient annular gasket member is placed inside a first conduit member (pipe or fitting). An annular retainer member is provided to secure the annular gasket member inside the first conduit member against longitudinal movement towards the open end of the first conduit member. A second conduit member is received by the assembled components comprising the retainer member, gasket member and first conduit member. The retainer ring member is fixed in place by a suitable adhesive or a suitable welding technique.

Abstract: The snap connection for sealed and releasable connection of a first tube end with a second tube end, with spring arms, with a first outer stop projection on the first tube end, with a first elastically deformable ring connected with the spring arms, and with two first inner stop cams on the first ring cooperating with the first outer stop projection, is characterized by a second outer stop projection on the second tube end, a second elastically deformable ring connected with the spring arms with distance from the first ring, and by two, second inner stop cams on the second ring cooperating with the second outer stop projection. Both rings with their stop cams, connected to one another via the spring arms, form a double-connection element separable by and on both tube ends, which can be made from a plastic injection molding part.

Abstract: A method of manufacturing a threaded joint for oil well pipe having a pin part with a male thread, a box part with a female thread, metal seal parts provided on the pin part and the box part, respectively, and torque shoulder parts provided at the tip of the pin part and at the portion of the box part coming in contact with the tip of the pin part, respectively, comprising the step of providing a design procedure for determining the dimensions of each part, whereby an highly strong threaded joint showing an excellent leak resistance to internal and external pressures can be designed and manufactured.

Abstract: A recessed portion is formed on an outer periphery of a cylindrical joint body to be inserted into a joint mounting hole of a fluid pressure apparatus. A pull-out preventing ring which is formed separately from the joint body can be deformed elastically in a radial direction, and has one or more annular edge(s) on an outer peripheral face which is fitted in the recessed portion and over the outer periphery of the joint body. The annular edge(s) of the pull-out preventing ring is(are) locked to a hole wall of the joint mounting hole when a force in such a direction as to pull out the pipe joint acts on the pipe joint.

Abstract: A system for sealing one end of a first air duct with an adjacent overlapping end of a second air duct incorporates multiple sealing components. One of the sealing components interacts and activates another of the sealing components. One of the sealing components mechanically compressively elastically deforms another of the sealing components.

Abstract: A pipe assembly comprises a first pipe section and a second pipe section of which at least one pipe section is provided with a spigot which is provided with outwardly annularly extending projections with flanks. A seal is arranged between two adjacent projections against their flanks. At least those projections between which the seal is arranged are formed as projections of increased wall thickness forming a portion of increased wall thickness and comprising a higher filling ratio than more distantly arranged projections.

Abstract: A line fitting employs blocks secured together with a stud and a nut and having gaskets or seals which militate against permeation of CO2 when subjected to high pressures and high temperatures, the seals are also resistant to decompression damage.

Abstract: An improved joining assembly employs a retainer ring member to hold in place a gasket member in a pipe or fitting. A resilient annular gasket member is placed inside a first conduit member (pipe or fitting). An annular retainer member is provided to secure the annular gasket member inside the first conduit member against longitudinal movement towards the open end of the first conduit member. A second conduit member is received by the assembled components comprising the retainer member, gasket member and first conduit member. The retainer ring member is fixed in place by a suitable adhesive or a suitable welding technique.

Abstract: The present invention provides for a flexible connection for connecting train cabins in a train. The connection comprises a first tubular train cabin having an end portion having a first diameter and a second tubular train cabin having a front portion having a second diameter. The second diameter is greater than the first diameter such that the end portion of the first train cabin fits within the front portion of the second train cabin.

Abstract: A tube coupling for the detachable coupling of tube line sections of a high-pressure tubing system. The tube coupling includes two coupling blocks held together by a damping screw, whereby one of the coupling blocks has a coupling plug that engages a plug socket provided on the other coupling block. A sealing ring is formed of a plastically deformable material and is enclosed between a front face of the coupling plug and a bottom-side sealing surface of the plug socket. In order to protect the sealing ring from being lost, damages and/or contaminated during assembly or opening and dosing the coupling, in a preassembled condition it is enclosed within a protective socket. To homogeneously load the sealing ring, the sealing ring is located at one point of a supporting triangle, the two other supporting points of being formed by a pair of supporting surfaces arranged side by side at an outer end of side flanges of the coupling blocks.

Abstract: A novel concentric pipe joint restraint is disclosed. The restraint is specifically designed to resist axial movement of an inner spigot pipe relative to an outer socket pipe with which it has been joined. The restraint, which operates within the annulus, generally comprises a spigot wedge ring, a socket wedge ring, and one or more specially designed wedge housings. The spigot wedge ring features one or more spigot gripping protrusions which, upon contact, frictionally engage the spigot pipe. The socket wedge ring similarly features one or more socket gripping protrusions which, upon contact, frictionally engage the socket pipe. The wedge housings position the spigot wedge ring and/or the socket wedge ring so that the gripping protrusions grip the pipes, preventing axial movement (whether separation or compression).

Abstract: A locking segment for use in connecting two lengths of pipe has a radically extending heel that serves as a rotational brake. By mating the brake into an annular trough, that is, by placing it between two walls, the rotation of the segment can continue only until points on the brake mure between the two walls. Rotation of the segment in response to increasing thrust pressures can thereby be arrested before the rotation causes the segment to bear on the spigot with a radially inward force great enough to penetrate the spigot.

Abstract: A pipe joint including a first pipe segment having a belled end and an annular gasket carried within the belled end, a second pipe segment having an end inserted into the belled end, passing through the annular gasket, and a beveled attachment carried by the end of the second pipe segment for facilitating the insertion of the end of the second pipe segment into the belled end of the first pipe segment passing through the annular gasket.

Abstract: Apparatus for manufacturing a socket end (12) which is provided with a sealing ring (9). The apparatus comprises an outer mould (1) for forming the outer contour of the sealing ring (9) and for forming the outer side of the socket end (12), and a core for forming the inner side of the socket end (12) and t he sealing ring (9). The core comprises a first core part (7a), a sleeve-like core part (7) which can be displaced on the first core part (7a), for forming a front for the sealing ring (9), a core part (8) which adjoins the first core part (7a) and can be contracted in the radial direction, for forming the inner contour of the sealing ring (9), and a second core part (6), which adjoins the contractable core part (8), for forming the inner side of the pipe part. The contractable core part (8) has a radially innermost position with an external diameter which is smaller than the internal diameter of the sleeve -like core part (7).

Abstract: A gas transfer fitting of an outdoor gas appliance is provided for allowing an outdoor gas appliance to connected to various disposable propane cans, and gas transfer fittings of various sizes; the gas transfer fitting includes threads on an outer side of a first end, and an inner side of a second end thereof, which are respectively provided for a connector of one end of a pipe of a gas appliance, and a neck of a disposable propane can to be connected to. The gas transfer fitting has a first through hole, a screw hole in communication with the first through hole, and a central conduit, which is screwed into the screw hole at one end thereof, and the other end of which is fitted into the neck of the disposable propane can.

Abstract: A pipe fitting includes a body having sockets for receiving pipes therein and a composite gasket housed within a circumferential gasket retention housing integral with the socket. The composite gaskets include a V-shaped carrier of relatively stiff plastic having an elastomeric seal portion bonded thereto.

Abstract: A straight opposing member insertion section located at the end of a hose tube and has a ring-shaped groove for inserting a sealing ring. The opposing member insertion section has a ring-shaped tongue piece and/or a ring-shaped ring supporting section. Tongue-piece has a sloped surface and an overhang positioned over the ring-shaped groove. Ring supporting section is an indentation on the ring-shaped groove that protrudes away from the end of the hose tube. A sealing ring is tightly inserted into the ring-shaped groove. A ring-shaped engagement projection on the end of the tube-shaped opposing member is pushed into the opposing member insertion section until the engagement projection abuts the sealing ring. Sealing ring and the section of the tube wall with the ring-shaped groove can be constructed to handle seal deterioration. The resulting fuel hose connection structure has superior fuel sealing properties, fuel impermeability and can be contructed simplely and inexpensively.

Abstract: A mechanical joint including a circular seal (4), a gland ring (5), an elastic ring (6) and a back-up ring (7), as well as a body (1), with closure and backing part (2), while the joint can further contain a counterseal as an option, the body can further contain the closure and backing part as an option, and the elastic ring (6) is optionally equipped with two symmetrical pitch union nuts (9, 10) and two gaskets (11, 12), as well as with a symmetrical pitch screw (13). The joint has application to all pipe couplings, with alignment stress or with misalignment tolerance.

Abstract: A short cylindrical connection cup is fitted and brazed to a pipe fitting port of a metallic tank. Afterward, the extremity of a resin pipe is inserted via an O-ring into the connection cup, and a caulking claw of the connection cup is caulked to press a flanged portion of the resin pipe.

Abstract: In the flow path to atmosphere venting hot exhaust gases of a clothes dryer, a fluid-tight seal between a flow-diverting elbow telescoped about a clothes dryer exiting conduit consisting of a rubber sleeve in increasing thicknesses in width in the direction of flow effective in providing an establish sealing contact into the sleeve at a location of its thickness which obviates leakage of gas through the telescoping connection.

Abstract: A compression fitting or joiner for joining pipe ends having a plurality of tiltable annuli (17, 18) removably receivable over the pipe ends (6,8) and a fluid sealing housing (11). The fluid sealing housing (11) encloses the annuli (17,18). The annuli (17,18) are restrained from longitudinal movement on one side by means of a tab (5) inserted in an aperture (7) located in the housing (11). When a pull-out force is applied to the pipe end (6 or 8), the housing (11) retrains each annulus (17,18) on one side, causing each annulus to tilt from a position substantially perpendicular to the housing. This tilt reduces the effective lateral cross-sectional area inside each annulus (17,18) resulting in the application of a compressive force to the associated pipe end (6) thereby holding the pipe end (6) within the housing. To subsequently remove the pipe end (6) from the housing (11) a force is applied to remove the tilt from the annuli (17, 18).

Abstract: A reinforcing arrangement for a pipe penetration in an element such as a wall or a loadbearing element, particularly in an environment subject to vibration, the wall having a penetration aperture therethrough. The pipe penetration includes a tubular device which extends at least partly through the penetration aperture and is provided with an external circular bead received in the penetration aperture and by which the tubular device is axially affixable in the penetration aperture. A retaining device fixes the bead in the penetration aperture and fixes the tubular device. A reinforcing sleeve or pipe installed in the tubular device in the region of the circular bead to provide internal reinforcement and stiffening of the tubular device. The reinforcing sleeve prevents vibration generated fatigue fracture of the tubular device in the region of the circular bead.

Abstract: A pipe structure includes an annular corrugation centered on an axis. The corrugation has a cylindrical liner centered on the axis, two annular sidewalls extending radially outward from axially opposite ends of the liner, and an annular crown extending axially between radially outer ends of the sidewalls. An annular cavity is centered on the axis and is bounded by the liner, the sidewalls and the crown. A structural filler is contained within the cavity.

Abstract: A pipe joint includes at least a first and a second pipe. A section of the first pipe is opened out and a further section of the second pipe is inserted into the section, so that both pipes overlap in an overlap region. A gap is formed between the section and the further section, into which gap a free-flowing sealing medium can be introduced via an input passage. In the method, a first and a second pipe are fitted together, a sealing medium is introduced into the gap between the pipes via an input passage, air located in the gap escaping via at least one output passage, and the input passage and the output passage are closed. The sealing medium, preferably an epoxy-resin/glass-fiber mixture, ensures especially effective sealing of the pipe joint and also an especially stable frictional connection between the pipes.

Abstract: A fitting or a mounting part including an end section extending in a longitudinal direction, which end section can be pressed together with a tube for establishing a connection. The fitting or mounting part has a ring-shaped elevation on the end section forming a space, a sealing ring in the elevation and at least one flow channel in the elevation. The flow channel extends diagonally to a plane in a longitudinal direction of the end section and changes a depth of the space.

Abstract: A locking segment for use in connecting two lengths of pipe has a radically extending heel that serves as a rotational brake. By mating the brake into an annular trough, that is, by placing it between two walls, the rotation of the segment can continue only until points on the brake mure between the two walls. Rotation of the segment in response to increasing thrust pressures can thereby be arrested before the rotation causes the segment to bear on the spigot with a radically inward force great enough to penetrate the spigot.

Abstract: A pipe joint assembly joins two double wall pipe sections together. The pipe joint assembly includes a first pipe section having at least one double wall corrugation on an end portion, a second pipe section having at least one double wall corrugation on an end portion and a joint formed by locating the first pipe section end portion and the second pipe section end portion in an overlapping relationship. The pipe joint assembly substantially increases the strength of the joint relative to conventional pipe assemblies.

Abstract: An in-line bell pipe is provided, formed by joining at least two corrugated sections of pipe having male and female portions to connect the corrugated sections. Each corrugated section has a plurality of first corrugations, each having a crest and a valley with the distance between the crest and valley of the first corrugations being a first distance. The male portion of each corrugated section has at least one second and one third corrugation, each second and third corrugation respectively having a distance between the crest and valley of each being a second and third distance respectively. At least one third corrugation crest has a recessed area which accomodates a sealing element retained between the recessed area and the female portion. The second and third distances each are less than the first distance. The female portion telescopically receives at least one third corrugation and at least a portion of a second corrugation.

Abstract: A novel concentric pipe joint restraint is disclosed. The restraint is specifically designed to resist axial movement of an inner spigot pipe relative to an outer socket pipe with which it has been joined. The restraint, which operates within the annulus, generally comprises a spigot wedge ring, a socket wedge ring, and one or more specially designed wedge housings. The spigot wedge ring features one or more spigot gripping protrusions which, upon contact, frictionally engage the spigot pipe. The socket wedge ring similarly features one or more socket gripping protrusions which, upon contact, frictionally engage the socket pipe. The wedge housings position the spigot wedge ring and/or the socket wedge ring so that the gripping protrusions grip the pipes, preventing axial movement (whether separation or compression).