Abstract: A locking washer 54a formed in a conical shape and a seal retainer 56a are disposed between a coupling member 30 and the internally directed flange 50 of a fastening nut 36a. These locking washer 54a and seal retainer 56a are placed so that an outer periphery thereof is positioned on the side of said coupling member, while an internal periphery thereof positioned on the internal surface of said fastening nut, when no external force is applied on said locking washer. When the fastening nut 36a is screwed to be tightened on said coupling member, the internal periphery of the locking washer 54a having recesses is reduced with its diameter, and the locking washer 54a together with the locking washer 54a urge the tubular conduit 38a into the coupling member 30 and grippingly deformably retain the conduit as indicated by the locking washer 54b. The conduit coupling of the invention is effectively applicable for any conduit formed of rigid metal or flexible plastic material.

Abstract: A coupling assembly for a first tubular member, comprising: a receiving member defining an opening adapted to receive the first tubular member, and having an inner portion defining an inner bore dimensioned to receive an end portion of the first tubular member, and an outer portion defining a first internal annular cavity communicating with the inner bore and having a diameter greater than the diameter of the inner bore; an annular locking member having an outer rim portion fitted within the first internal annular cavity, and having an inner portion of generally frustoconical shape angled inboard from its outer rim portion such that its inner rim extends in its relaxed position into the inner bore so that the inner rim contacts and penetrates the outer surface of the first tubular member when the first tubular member is inserted into the inner bore, to inhibit separation of the first tubular member from the receiving member; a stop member abutting the outboard side of the outer rim portion of the locking memb

Abstract: A tubing joint having a long life span, in which stress concentration can be avoided even if external force from the tube repeatedly works on the ring claw. In the tubing joint of the present invention, the ring claw is formed into a zigzag shape with outer notch sections and inner notch sections. The ring claw has a plurality of outer ring sections, a plurality of inner ring sections, each of which is provided between adjacent outer ring sections, and a plurality of connecting sections, each of which connects an end of the inner ring section with an end of the outer ring section. The outer notch sections are substantially formed into a U-shape, and inner edges of adjacent connecting sections, which mutually face and form each U-shaped outer notch section, are arranged parallel and substantially perpendicular to the outer edge of the ring claw.

Abstract: A tubular joint including at least a pair of connection ports having an inner diameter substantially equivalent to an outer diameter of tubes to be connected, and a tubular connection part connecting the connection ports to each other. The connection ports each have a sealing member formed integrally thereon by extruding elastomer resin into a first recess formed around an axial line on an inner circumferential face of the connection ports, and the connection ports each have a fall-out preventing member coupled to an end part of the connection ports. The fall-out preventing member includes a ring-like member having an outer diameter sized for insertion into the connection ports, and a number of claws having leading edges located in a second recess formed around the axial line on the inner circumferential face of the connection ports and extending toward a center of the connection ports.

Abstract: The disclosure relates to a grab ring comprising an annular element having one set of teeth projecting outwardly at an inclined angle to the annular element to one side thereof and a second set of teeth projecting inwardly at an inclined angle to the annular element to the other side thereof to engage between a pair of inner and outer concentric cylindrical surfaces to permit relative movement between the surfaces in one direction whilst preventing relative movement in the opposite direction.

Abstract: The present invention relates to a fastening system for fastening a through pipe to a hearth wall, the pipe opening into a box. The fastening system comprises external pipe-securing means for securing the pipe to said screen, and an internal metal guide tube fitted over said pipe and having one of its ends interposed between said pipe and the orifice through which said pipe passes, its other end being externally threaded. The guide tube carries a rigid washer which is disposed so as to abut against the inside face of the inside layer, and against which a wall of the box is mounted, which wall is provided with an orifice that is larger than the cross-section of the guide tube, a sealing device being clamped against the wall of the box by a nut screwed onto the threaded end of the guide tube.

Abstract: The device for connecting a length of duct to a coupling endpiece of an apparatus or a member includes at least one tubular sleeve having two portions in axial succession, the first portion being internally fitted with components of an instant connection coupling for the end of a length of duct, the second portion including means for sealably and releasably covering the coupling endpiece, the end face of the endpiece forming an axial abutment at the end of the length engaged in the first portion of the sleeve.

Abstract: A coupling comprising a first member defining a socket, a second number such as a tube defining a spigot inserted into an open end of the socket, and a locking device received within an annular gap defined between an inner wall of the socket and an outer wall of the spigot. The locking device comprises circumferentially spaced load-bearing members, each load-bearing member extending within the annular gap from a first end which is relatively close to the open end of the socket and a second end which is relatively remote from the open end of the socket. Each load-bearing member is resiliently biased such that the first end engages the socket and the second end engages the spigot, and each load-bearing member is dimensioned such that it acts substantially as a beam in compression to resist withdrawal of the spigot from the socket.

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 coupling device for a tube, the device comprising a body provided with a bore for receiving the end of said tube, and means for retaining the tube in the bore, which means are constituted by an elastically deformable washer that is substantially frustoconical in shape whose inside circumference is of a diameter smaller than the outside diameter of the tube and which is subdivided into a plurality of teeth, the outside portion of the washer being disposed in a groove formed in the bore. Each tooth possesses a short root portion which, at rest, extends in a radial plane, and an active portion that is inclined relative to the radial plane of the root, and each tooth is connected to the teeth adjacent thereto via small section peripheral link portions of length not less than the length of each tooth.

Abstract: A tubular metal coupling body defines a chamber which receives an axially movable tubular actuating member defining a bore for receiving an end portion of a metal tube. A counter-bore within the actuating member receives a resilient sealing ring and a compression collar, and a tube gripping spring collet is supported by a retainer confined within a cap threaded onto one end portion of the coupling body. A tubular actuating sleeve surrounds the body and is retained for limited axial movement, and a fitting is threaded into the opposite end portion of the body. A set of circumferentially spaced levers are supported within corresponding slots in the body for pivotal movement in radial directions and move the actuating member axially between released and gripping positions in response to axial movement of a cam surface within the sleeve.

Abstract: An improved joint for coupling flexible hoses for forming an air or oil supply system for an automobile or outdoor machines and equipment. The joint is provided with hose clamp means such as a collet which bites the outer peripheral surface of the top end of the hose inserted into the joint and a cover member for controlling the movement of the hose and at the same time, it is provided with several means for sealing the hose with respect to the joint so that the entry of water into the joint can be completely prevented and the corrosion of the joint elements and the hose within the joint can be eliminated to thereby keeping the sealing property of the joint for a long time.

Abstract: A pipe connecting member which includes a cylindrical receiving member has a first end and a second end. The first end of the cylindrical receiving member has a fusion part into which an end portion of a resin pipe can be received, and also has a coil buried therein. The coil has two energization terminals to allow the coil to be heated by energization thereof. The second end has a connecting part. A conduit composing part having at least one opening is provided, and the connecting part of the second end of the receiving member is connected to one opening of the conduit composing part.

Abstract: A vent piping coupler for coupling vent piping to a threaded vent outlet of a pressure regulator or other venting device to vent the device vent outlet to a remote location. A coupler body with a first threaded section for threadably mounting into the vent outlet, a locking ring with projecting tabs to grip into the vent outlet, and a lock nut threadably mounts to a second threaded section on the coupler body which includes a slot. The lock ring has an anti-rotation tab engaged in the slot to lock the coupler body in position on the vent outlet when the lock nut is tightened. A grip ring with inwardly angled teeth is crimp mounted at the other coupler body end to insertably receive a vent piping which is locked in position by the angled teeth. Respective O-rings may be used to seal the coupler body to the vent outlet and to the vent piping.

Abstract: A quick connect fitting for connecting a plastic or metallic tube (42) in a fluid circuit includes a fitting body (20) having an interior cavity (22) opening to the exterior of the body (20) via a generally circular port (36). A peripheral step (48) is located in the port (36) and an O-ring (50) is abutted against the step (48). A washer (52) is located in the port (36) and has a central opening (54) slightly larger than the outer dimension of the plastic or metallic tube (42). A peripheral flange (56) is disposed on the washer is directed away from the O-ring (50). A retaining ring (62) is disposed in the port (36) and nominally abuts the flange (56). The retaining ring (62) has a central opening (64) substantially greater than the outer dimension with a plurality of resilient, radially inwardly directed, angularly spaced fingers (66).

Abstract: This fitting is of the type whose body has a cross bore and at one end, means to connection to one of two elements to be connected using said tubes while at its other end it has an annular chamber coaxial to the bore meant to receive one end of a tube by simple engagement, the chamber holding various annular mechanisms to retain the tube, coaxial to the chamber and arranged between its wall and the tube, that is, a retainer ring partially closing the chamber and able to slide in it, a waterproof seal and a part with radial prongs. According to the invention, the fitting is made up of, on one hand, a body 4 having said cross bore 10 and said connection means 11 and 12 and, on the other hand, of a bushing 5 which can be assembled in the body 4, limiting said chamber 20 and made up of means 30 to 33 for retaining the various aforementioned mechanisms 21, 22 and 23 which it holds.

Abstract: A method and apparatus for achieving a fluid tight seal of a fluid coupling having an axis, wherein a spring interposed between a coupling nut and an inner member of a first coupling element is compressed when the coupling nut is engaged with a second coupling element and rotated in a tightening direction such that complementary sealing surfaces between the first and second coupling elements are axially pre-loaded to achieve a fluid tight seal. A fluid tight seal is dependent on the axial compression of the spring, indicated by the axial location of the coupling nut with respect to the inner member and second coupling element, and is visually indicated by the rotational relationship of the coupling nut and the second coupling element.

Abstract: A detachable push-in connector for semirigid pipes, consisting of housing (1) having a through hole (2) and a plurality of cavities increasing step-wise in size to receive a pipe (3), and a sealing ring (7). Sealing ring (7) is preceded, in the push-in direction of pipe (3), by a retaining ring (14) having inwardly projecting spring tongues (16) capable of opening out elastically and that is held in place by a supporting ring (17). Tongues (16) form a flat truncated cone whose tip points in in the push-in direction. Between retaining ring (14) and sealing ring (7) is a stop ring (9) having a conically bevelled inner portion in the region of spring tongues (16) to permit them to open out. A disconnecting ring (22) axially slidable relative to supporting ring (17) is disposed upstream of retaining ring (14) in the push-in direction and has a conical forward edge (23) for spreading out spring tongues (16) of retaining ring (14 ) when disconnecting ring (22) is pressed into housing (1).

Abstract: This invention is regarding to a fast connection joint for pipe fitting, particularly for those applications where prevention of water spraying in large quantity is required. Its structural design allows connecting or disconnecting an external pipe or faucet, without the need to shut off the water automatically opens when a pipe or faucet is inserted into the connection joint and automatically closes when the pipe or faucet is withdrawn.

Abstract: A sealing ring for sealing off a joint between a fluid power line and a fluid power component to be connected therewith. At one axial side the sealing ring has two overpressure sealing lips arranged in a v configuration. At the opposite axial side a thrust portion is provided for cooperation with a gripping element. The thrust portion and an inner underpressure sealing portion provided thereon define a radially moving pivot ring. If the fluid power line is under vacuum, the pressure of the surroundings causes the pivot ring to be shifted inwards and the underpressure sealing portion is thrust sealingly against other surface of the fluid power line.

Abstract: A conduit assembly has a retainer with a pair of retaining elements. The first of the retainers maintains a seal in the housing assembly. The second retainer retains the conduit in the housing. One of the retainers has arms with an overall U-shape including at one end, one of the arms being coupled with its ring and at the other end, the arm includes a mechanism for abutting the annular bead to retain the conduit in the housing. The arms include an insert which may be of different material to retain the conduit within the housing.

Abstract: The present invention relates to a union device for pipe joints, where the joint is within the wall thickness of the pipes being joined, and includes a female part (1) and a male part (2), which in substantially complemental implementation permits the male part (2) to be inserted into the female part (1). In the outer and inner peripheral surfaces of the male and female parts there are grooves (5,11) extending around the periphery such as to form a cavity for a locking ring when the joint has been assembled. In this cavity there is a locking ring having a rhomboid form in cross section with cut away portions at the long sides of the two diametrically opposite acute corners and being of a material which retains its shape with a given resiliency. This locking ring is provided with a through slit or with one or more shorter slits from its large end towards its small end.

Abstract: A fluid coupling includes first and second connectable fittings. Each of the fittings include a body, an annular seat, and a fluid channel extending through the body and seat thereof. The first fitting includes a pair of latch bosses, and the second fitting includes a pair of latch arms, with the second fitting being rotatable relative to the first fitting to a latched position wherein the latch arms engage the latch bosses for maintaining the first seat adjacent to the second seat for allowing fluid to flow between the first and second channels. The fittings are also rotatable to a disengaged position wherein the latch arms and pins are disengaged to allow the first and second seats to be separated.

Abstract: A separable device for connecting tubular elements, hoses, rods or the like, comprising a tubular housing and a clamping member. In such a connecting device, a passage is formed in the tubular housing and comprises at least near one end a portion which is enlarged in diameter and which conically tapers toward the exit cross-section of the passage. The clamping member consists of a tubular member, which has an inside diameter that corresponds to the outside diameter of the tubular member, hose, rod or the like, and an outside diameter that corresponds to the diameter of the exit cross-section of the tubular housing. The tubular clamping member is adapted to be inserted into the tubular housing and into the enlarged portion to be retained therein by an enlarged end rim consisting of an annular bead, the outside diameter of which is smaller than the inside diameter of the enlarged portion but larger than the exit cross-section of the passage.

Abstract: A pipe coupler is designed such that a sealing ring (5), an annular chuck (6) and a release ring (4) are inserted into a mounting recess (2) of a coupler main body (1). Annular reaction surfaces (601, 602) are provided at the tip side of the annular chuck (6), and an action surface (301) for contrating the diameter is provided at the internal periphery of the mounting recess (2). Claws (603) are formed at the tip of the annular chuck (6), and a slit (604) is provided in the annular chuck (6) for permitting enlargement and contraction of the chuck's diameter. When a flexible tube (7) is inserted into the mounting recess (2), the diameter of the annular chuck (6) is enlarged. In this condition, when a compressed fluid is supplied, the claws (603) bite the flexible tube (7). As the release ring (4) is pressed into the mounting recess (2), the engagement of the claws (603 ) with the flexible tube (7) is released.

Abstract: In accordance with this invention, an adjustable coupling device for releasably interconnecting confronting ends of first and second fluid carrying conduits is provided. A bell flange is attached to the confronting end of one of the conduits. This bell flange has an arcuate internal sealing surface adjacent the lip thereof and a recess extending inwardly longitudinally from the arcuate sealing surface. A sealing flange is attached to the confronting end of the other of the conduits and is sized to be received within the bell flange. It also includes a peripheral abutment spaced from the outer end thereof. A sleeve is mounted on the end of the sealing flange and has a curved outer surface and an inner surface engageable with the abutment to limit the inward movement thereof. A sealing ring is mounted on the sealing flange adjacent the sleeve and is engageable with the arcuate sealing surface of the bell flange when the flanges are drawn together.

Abstract: A rapid coupling arrangement, especially for engine blocks of internal combustion engines in which all bores in the engine block are non-threaded bores which can be made in a single operation. The coupling arrangement further includes a bushing member which assists in retaining a spring member that can lock a tubular connecting member in place after its insertion into the bushing and engine block.

Abstract: A connector for smooth pipes characterized by having one of the ends of the sleeve (3) equipped with a peripheral housing (4) receiving locking rings for fixing the connector securely on one end (1) only of one of the pipes to be connected, the end of the other pipe (2) being able to slide freely in the sleeve (3) while being in contact only with the corresponding lip (15) of the joint (13).

Abstract: This catch, which may be used either with rapid connections which can be uncoupled, and those which can not, is of the type which consists of an annular part (2), of spring steel, having teeth (4), directed radially inward, and of which the free edges (4a) are inscribed in a circle (5) of diameter (D.sub.1), greater than the outer diameter (D.sub.2) of the tube (6) for which the rapid connection equipped with this catch is intended. Each tooth (4) has a free edge (4a) in a circle arc of radius (R) less than that of the circle (5) in which this free edge (4a) is inscribed.

Abstract: An instant connection device for fluid conduits is provided having a general cylindrical configuration, with a base portion in the form of a ring and flexible jaws whose ends define an annular bearing surface and have on the inside a circular engagement edge. The clip is obtained from a metal sheet blank having a circular central portion extended by first and second evenly spaced lugs with radial axes, the blank being subjected to stamping operations. The clip is cheap and simple to manufacture. Furthermore, it is possible to associate therewith an elastomer block by moulding thereover forming a push ring and a seal.

Abstract: A quick connect fitting in which tubing can be inserted into a pre-assembled fitting where it will become sealed and locked against pull-out. A main fitting body has an open-ended recess in which is located a movable piston to seal against the body and an inserted tube. The piston wedges over a conical extension on a sealing gland retained by a screw-on cap. The sealing gland has rearward, circumferentially spaced fingers radially movable. An axially shiftable ring, in one position, allows the fingers to expand to receive the tube, and, when shifted to a second position, moves the finger to engage the extension surface of the tube to lock against withdrawal.

Abstract: An inlet water line connector for connecting an inlet water line to the end of a water faucet shank having external threads on the outer cylindrical surface thereof. The body has an opening therethrough into which first end and inlet water tube of a predetermined outer diameter may be inserted. The body has an outer tapered surface for fitting within and engaging a tapered internal inlet region of the faucet shank. The outer tapered surface of the body has a forced fit with the tapered internal inlet region of the faucet shank. A retention member is disposed within the body and has a relaxed state and a holding state. The retention element remains in its relaxed state as the water line is inserted through the body whereby it is in spaced relation to the water line. The retention element is moved into its holding state after the water line has been inserted through the body to place the retention element into intimate contact with the water line.

Abstract: A connector structure includes a body having a cylindrical recess dimensioned to receive the end of a piece of conduit and a retaining clip to hold the conduit in the recess. The cylindrical recess is provided with an annular recess. The clip comprises a ring with inwardly extending fingers bent out of the plane of the ring, one or more of the fingers having ends thereof bent to form latch tabs. When the conduit is inserted through the clip into the cylindrical recess, the rings are bent against the inner walls of the cylindrical recess so that the tabs enter the annular recess, the intermediate tabe engaging the outer surface of the conduit to hold the assembly together.

Abstract: A releasable plug connection for semi-rigid pipes in which the elastic retaining ring for holding a pipe in the connection is seated in a flanged ring portion of the stop ring that limits opening movement of the spring taps of the retaining ring and a supporting ring is located between an end face of the flanged ring portion and a plurality of shoulders spaced around the periphery of the entrance to the connection to hold the retaining ring in place.

Abstract: A joint mechanism for connecting easily and tightly thin-wall stainless steel pipes (1) with an annular bead (6) at an end, which includes a joint sleeve (2) having a pair of annular recesses (7) at opposite ends and a central enlarged collar portion (9); a pair of coupling nuts (3) with an inclined shoulder (13) on the inside; and a pair of conical disc springs (5) with a distinctly colored outside (5a) mounted between the central enlarged collar portion and the coupling nuts. When the coupling nuts are threaded over the joint sleeve completely, the conical disc springs are compressed between the central enlarged collar portion and the coupling nuts making the distinct color of the conical springs invisible, thus indicating that the coupling nuts are fully tightened.

Abstract: A quick connect coupling for fluid conduits having an outer cylindrical member and an inner conduit fitted within the outer cylindrical member including a continuous circular gripper ring seated in the outer cylindrical member and having radially inward gripper teeth bent axially forward toward the outer cylindrical member in a generally conical plane, each tooth has a twist in a common direction whereby the inner conduit can be slid into the gripper ring but removed from the gripper ring only by unscrewing from the gripper ring.

Abstract: A labyrinth seal for sealing the gap between the rotating impeller assembly and the stationary housing of turbomachinery comprising a seal holder which serves simultaneously to comprise the stationary part of the seal and to contact process gas so as to maintain the stationary seal part temperature at about the temperature of the rotating part, thus reducing differential thermal change between the stationary and rotating members of the labyrinth seal.

Abstract: Quick connector for flexible tubes or pipes, which comprises a hollow body, equipped on the inside with a seating for an annular seal, to which body is secured a collar carrying a conical elastic ring having radial slits open towards the inner edge, the ring diverging towards the free end of the body, into which conical ring there may be inserted a flexible tube in sealing contact with the annular seal, which tube can be advanced towards the interior of the hollow body with limited elastic deformation of the conical ring and in conditions of jamming of said conical ring when the tube moves outwards, there being also present a shell projecting outwards from the body and surrounding the flexible tube and having a tapered end towards the inside, the shell being in contact with the internal edge of the slit conical ring and being adapted for preventing, when pushed inwards into the hollow body, the jamming of the conical ring on the surface of the flexible tube, thus making its withdrawal possible.

Abstract: A metal gasket for a face-seal fitting has an outer section in the form of a circular annulus, an inner section in the form of a circular annulus and having a shorter axial dimension than the outer section. The inner section and outer sections are joined by a tapered section having conical faces on opposite sides thereof facing toward the axis of the gasket. A method of prolonging the useful life of a tubular element in a face seal fitting involves repeatedly engaging an end of the tubular element with the conical face and, when the end of the tubular element wears, engaging the end with a radial face adjacent to the conical face.

Abstract: A quick-connect fitting assembly is disclosed for releasably connecting a pair of fluid conduits in fluid communication with one another. A socket portion on one of the fluid conduits is adapted for receiving the other fluid conduit inserted longitudinally into the socket portion. A laterally-extending protuberance on the inserted fluid conduit is longitudinally restrained by a retaining assembly generally adjacent the fluid socket, with the retaining assembly including one or more resilient spring of barb members longitudinally interlocked with the inserted fluid conduit. A pair of collar members are longitudinally interconnectable with one another, either by a threaded engagement or by a "bayonet-type" engagement, to releasably restrain the assembly in a connected condition.

Abstract: The non-profiled end portions of two pipes can be coupled to each other by a ring-shaped band which has at least one axially parallel gap and circumferentially extending corrugations defining two outer chambers and at least one median chamber. Each chamber is open toward the peripheries of the pipes and each outer chamber surrounds a different pipe. Such outer chambers contain arcuate safety devices with radially innermost portions in the form of claws serving to penetrate into the material of the respective pipes when the band is tightened around the end portions of the pipes by a clamping unit which is designed to reduce the width of the gap. The median chamber of the band confines a deformable annular insert which has marginal sealing lips and serves to establish a seal between the internal surface of the band and the peripheral surfaces of end portions of the pipes when the clamping unit is actuated to reduce the diameter of the band.

Abstract: A pipe connection for instruments or machines, with a flange on the machine side, which has a means of attachment for connecting a flange on the pipe side.

Abstract: A hose coupling which has an integrally moulded lip which has an innermost surface defining a frusto-conical shape and a portion of reduced thickness to provide for pivoting freedom of the lip to effect both a grip and seal of a hose that can be inserted therethrough. The lip has axially extending tails which are segmented allowing for expansion or contraction as necessary of the lip but providing a limit to the pivotal freedom of such lip.

Abstract: Hermetic connection device comprising a double curve ductile joint (3) and two supports (1,2), the joint (3) being connected between the two supports (1,2) stressed towards each other along axis (8) and defining on one section of their thickness only two parallel surfaces (4,5) at an angle to axis (8), characterized in that in the normally clamped state the geometric characteristics of the supports (1,2) and of the joint (3) are such that contact between the joint (3) and the two supports (1,2) is made on the one hand through each inclined surface (4,5) respectively along a line of contact (9,10) and on the other hand by each extreme end of joint (3) supported against another surface (6,7) of the male support (1) or female support (2) respectively.

Abstract: A connection device is provided for plastic material or metal tubes conveying a compressed fluid in which the tube 3 is fitted instantaneously by a simple thrust in means providing molding for said tube by a member 1 and sealing thereof by a member 5, the means 2d formed on the outer casing 2 receiving an independent disassembly element for instantaneous disassembly of tube 3.

Abstract: A quick connect female coupling with a brasing means in a bore of the coupling that bias an O-ring type packing in sealing engagement against part of the coupling and a pipe end portion when the coupling is in use. A retaining ring in the coupling snap fits against an external collar of a pipe end portion as a retaining means when the coupling is in use.

Abstract: Disclosed is a sealing ring comprising a molded elastomer ring having an inner ring contained therein which forms a pipe joint between two abutted pipe ends. Each of the pipe ends includes a recessed part, a flange or the like, which can be clamped together, for example, by means of a screw, and each of which has a sealing cavity into which the two axial ends of the sealing ring sealing the joint project. The axial ends of the sealing ring are deformed by the clamping together of the two recessed parts or the like and conform to the contour of the interior of the corresponding sealing cavity. To facilitate assembly and improve sealing properties, the two outer annular edges of the molded elastomer ring which rest against the surface of the two pipe ends are rounded and thus provided with a radius (R1).

Abstract: A connection between the outlet of a flush valve and a flush tube includes an outlet fitting for the flush valve having an exterior thread thereon and a flush tube which extends within the outlet fitting. A coupling nut having an interior threaded area for attachment to the fitting also has an inwardly-directed annular shoulder which extends closely adjacent the flush tube and with the end of the fitting, defines an annular chamber. Positioned within the annular chamber is an annular elastomeric gasket in contact with an end of the fitting and in peripheral contact with the flush tube. A back-up ring is positioned within the chamber for circumferential contact with the gasket and a clip ring is positioned within the chamber between the back-up ring and the coupling nut shoulder and is adapted for surface penetration engagement with the exterior of the flush tube.

Abstract: Rings of shape memory metal are deformed to be insertable between coaxial and overlapping surfaces of a conduit and a coupler so that upon heating above their transition temperature, the rings attempt to return to their undeformed shape and seal the opening between the two surfaces; the sealing rings being concave-convex with the convex surface directed toward the adjacent end of the conduit whereby interval pressure in the conduit tends to further expand the metal and increase the seal. Retainer rings in the general form of the section of a conic may be employed to provide additional strength against separation.

Abstract: A metal gasket for a face-seal fitting has an outer section in the form of a circular annulus, an inner section in the form of a circular annulus and having a shorter axial dimension than the outer section. The inner section and outer sections are joined by a tapered section having conical faces on opposite sides thereof facing toward the axis of the gasket. A method of prolonging the useful life of a tubular element in a face seal fitting involves repeatedly engaging an end of the tubular element with the conical face and, when the end of the tubular element wears, engaging the end with a radial face adjacent to the conical face. .Iadd.