Abstract: An expansion joint spring clip can eliminate flutter, pulsations and reverse bending on non-metallic fabric flue duct expansion joints. The expansion joint spring clip can hold the expansion joint in a fixed arch such that it can still perform its function with regard to accommodating the ducting system movements. The expansion joint spring clip allows the entire width of the non-metallic expansion joint to retain its position during start-ups, downloading and during full or partial boiler, kiln, furnace loads and the like. The expansion joint spring clip can be installed in the existing geometry of an expansion joint by producing an arch while not damaging the expansion joint after being installed. The expansion joint can still accommodate axial and limited lateral movements, allowing the expansion joint to perform its function.

Abstract: A system includes a gas turbine engine, a nozzle structure located adjacent to the gas turbine engine, a flexible annular seal linking the gas turbine engine and the nozzle structure, the flexible annular seal having a plurality of corrugate sections arranged about a centerline, and a connection device secured to the gas turbine engine and to the nozzle structure. The connection device is adjustable to select a length of the flexible annular seal measured along the centerline.

Abstract: A vibration isolator is described for inhibiting transfer of vibration to an apparatus during evacuation thereof by a pump. The isolator comprising a bellows for isolating from the ambient atmosphere fluid drawn from the apparatus by the pump. A first flange is connected to one end of the bellows for mounting the isolators the apparatus, and a second flange is connected to the other end of the bellows for mounting the isolator to the pump. The bellows surrounds a resilient element, preferably a helical tension spring, which is substantially co-axial with the bellows. The resilient element has a first end located proximate to the first flange and connected to the second flange, and a second end located proximate to the second flange and connected to the first flange.

Abstract: A fluid system component is provided that includes first and second elements configured to be removably engaged with each other and defining a fluid passageway when engaged. The first element defines at least one groove. Correspondingly, the second element includes at least one engagement member configured and arranged to be received in, and travel along, a corresponding groove. The presence of a line pressure in the passageway substantially forecloses disengagement of the first and second elements until the fluid pressure in the fluid passageway has decreased to a predetermined magnitude. A handling and locking mechanism for selectively securing the second element relative to the first element is included. The locking mechanism includes a movable pin controlled by a pin handle adjacent a collar handle. The pin and collar handles can be gripped simultaneously by the same hand of a user to release the first element relative to the second element.

Abstract: A telescopic tube for an electric household appliance comprises a first outer tube and a second inner tube slidable inside the first outer tube. An eletricity conduction system comprises: a) an elongate guide body comprising non electrically conductive material; b) a locking member for connecting the first end of the elongated guide body to the second inner tube; c) an outer channel connected to an outer surface of the first outer tube, the outer channel being provided for slidingly receiving the elongated guide body; d) a pair of tubular-shaped electric conductors contained in the elongated guide body; and e) a corresponding pair of substantially rigid rod-shaped electric conductors which are able to slide, at least partially, within the tubular-shaped electric conductors so that each rod-shaped electric conductor is in contact with an inner surface of a corresponding tubular-shaped electric conductor.

Abstract: The invention relates to a connection piece (1) for the articulate connection of a first and a second tube (3, 5), in particular a first and a second tube (3,5) of a hot air supply system fed from the power unit of an aircraft, with the possibility of compensating for tolerances, wherein an interval (40) between a tube end (2) of the first tube (3) and a tube end (4) of the second tube (5) is enclosed by a sealing mechanism (6). According to the invention both tube ends (2, 4) each have a support ring (14, 15), wherein the support rings (14, 15) are connected to each other by at least two connection means arranged outside the sealing mechanism (6). At least two metal bellows (7, 8) are preferably used as the sealing mechanism (6), which enable almost maintenance-free operation. Steel ropes (22, 23) are preferably used as connection means.

Abstract: An exhaust pipe decoupler for vehicles including a bellows (10), an outer braid member (20) spaced from the bellows and braided with a predetermined angle, a retainer (30) having a support (31) inwardly curved at both ends thereof for engaging to a ring damper (40), the retainer being affixed to the ends of the bellows (10) and installed between the outer surface of the bellows (10) and the outer braid member (20) to prevent direct contact thereof, the ring damper (40) located outward the support (31) formed in the retainer (30), a fixing cap (50) coupled to the outer diameter of the outer braid member (20) in order that the outer braid member (20) and the retainer (30) are located outward the bellows (10), wherein the outer braid member (20) absorbs tension in excessive outer forces, i.e., displacement of tension and compression, and the ring damper (40) controls the displacement of compression and shear displacement by the ring damper (40), thereby controlling the bellows within the elastic range.

Abstract: This pipe joint comprises a hollow cylindrical joint body made of elastic material such as heat-resistant rubber with a prescribed length, and a circular flange for connecting piping attached to the both sides of the joint body, on the side of the inner circumference of the joint body is provided a bellows metal pipe closely contacted with the joint body, and the thickness of the joint body is at least larger than the size of the summit or the trough of bellows of the metal pipe.

Abstract: An exhaust-vibration decoupling connector has an inlet tube (1) extended downstream from a decoupler inlet (2) to an inlet-tube step (22). The inlet-tube step includes a radially inward extension of the inlet tube to a damper seat (23) that includes further downstream extension of the inlet tube having a bend (36,37) which interlocks with a radially inward extension (24) of an outlet tube to prevent the connector from extension movement. An outlet tube (4) is extended upstream from a decoupler outlet (5) to an outlet-tube step (24) that includes a radially inward extension of the outlet tube to proximate an outside surface of the damper seat. A vibration damper is positioned removably in a damper fixture (3) that includes the damper seat intermediate the inlet-tube step and the outlet-tube step proximate midway between the decoupler inlet and the decoupler outlet.

Abstract: An exhaust-vibration decoupling connector has an inlet tube (1) extended downstream from a decoupler inlet (2) to an inlet-tube step (22). The inlet-tube step includes a radially inward extension of the inlet tube to a damper seat (23) that includes further downstream extension of the inlet tube. An outlet tube (4) is extended upstream from a decoupler outlet (5) to an outlet-tube step (24) that includes a radially inward extension of the outlet tube to proximate an outside surface of the damper seat. A vibration damper is positioned removably in a damper fixture (3) that includes the damper seat intermediate the inlet-tube step and the outlet-tube step proximate midway between the decoupler inlet and the decoupler outlet. Surrounding the vibration damper, a decoupler bellows (7) has an upstream bellows attachment (9) proximate an outside periphery of the inlet tube and a downstream bellows attachment (10) proximate an outside periphery of the outlet tube.

Abstract: A flexible slide joint is provided for accommodating axial, rotational and angular misalignments between two fluid conveying members. The flexible slide joint basically has first and second tube members with a sliding sealing member and a axially compressible element coupled therebetween. The sliding sealing member is configured and arranged to accommodate axial movement upon a first predetermined axial force occurring between the first and second tube members. The axially compressible element is configured and arranged to accommodate axial movement upon a second predetermined axial force occurring between the first and second tube members. The axially compressible element is force balanced relative to the sliding sealing member such that the second predetermined axial force is smaller than the first predetermined axial force.

Abstract: Both ends of a bellows-type outer cylinder [31] capable of axial expansion and contraction are connected in a leakproof manner to a pair of connection passage ends [20], thereby constituting an expansion passage [30]. A cylindrical resin film [33] having no permeability to fluid is arranged in an interior of the bellows-type outer cylinder [31], and the axial ends thereof are connected in a leakproof manner to said connecting passage end regions. The cylindrical region [34] positioned in the intermediate region of the cylindrical resin film [33] covers the inner surface of said bellows-type outer cylinder [31] in a leakproof manner.

Abstract: A decoupling hose for mounting in an exhaust pipe of a motor vehicle engine, the hose comprising in particular an inner mechanical portion for guiding the flow of exhaust gas through the hose, a sealing portion forming an outer casing that is leakproof relative to exhaust gas, an intermediate portion providing thermal insulation, and means for connecting the ends of the inner and outer portions of the hose to the exhaust pipe, wherein the inner mechanical portion of the hose is constituted by a metal tubular part in the form of sheet metal joined by dual folded seam connections that are very loose.

Abstract: A method and apparatus for monitoring a pipeline expansion joint, in particular the conditions of a pressure-balanced expansion joint. A sensor is positioned so as to sense one or more physical characteristics of a pipeline fluid flow. A signal generated by the sensor(s) is received by a suitably configured electronic controller. The controller, in turn, is connected to a flow control valve, that is movable between at least an “off” or “no-flow” position, and a flow permitting position, connecting a source of compressible medium and the volume confined between the two (or more) balancing bellows of a pressure-balanced expansion joint. An accumulator may also be provided, that may be connectable via the flow control valve, to the confined volume. The controller will be operably configured to cause the valve to be moved, in response to signals received from the sensor(s) that correspond to stored numerical data in the controller that represent different potential operating conditions.

Abstract: A flexible connector apparatus for decoupling vibrations, for example, along the components of an internal combustion engine exhaust system. The flexible connector apparatus is provided for connecting first and second components in the exhaust system, and includes a bellows for accommodating relative movement between the first and second components. The flexible connector apparatus includes an attachment construction which enables weldless, gasketless connection of the bellows to at least one of the first and second components. The flexible connector apparatus may include a liner tube structure having inlet and outlet liner tubes.

Abstract: A flexible connector apparatus for decoupling vibrations, for example, along the components of an internal combustion engine exhaust system. The flexible connector apparatus is provided for connecting first and second components in the exhaust system, and includes a bellows for accommodating relative movement between the first and second components. The flexible connector apparatus includes an attachment construction which enables weldless, gasketless connection of the bellows to at least one of the first and second components. The flexible connector apparatus may include a liner tube structure having inlet and outlet liner tubes.

Abstract: An expansion joint for high temperature air or other gaseous flows, of the type in which two duct ends are separated by a gap, that is bridged by overlapping inner and outer liner ducts. The inner and outer liner ducts are surrounded by at least one insulating pillow. The periphery of the expansion joint is surrounded by a flexible cover. A bellows liner structure is disposed between the inner and outer liner ducts and the at least one insulation pillow.

Abstract: A method and apparatus for monitoring a pipeline expansion joint, in particular the conditions of a pressure-balanced expansion joint. A sensor is positioned so as to sense one or more physical characteristics of a pipeline fluid flow. A signal generated by the sensor(s) is received by a suitably configured electronic controller. The controller, in turn, is connected to a flow control valve, that is movable between at least an “off” or “no-flow” position, and a flow permitting position, connecting a source of compressible medium and the volume confined between the two (or more) balancing bellows of a pressure-balanced expansion joint. An accumulator may also be provided, that may be connectable via the flow control valve, to the confined volume. The controller will be operably configured to cause the valve to be moved, in response to signals received from the sensor(s) that correspond to stored numerical data in the controller that represent different potential operating conditions.

Abstract: A fastener has an integral closure. The fastener maintains the relative position of concentrically nested or telescopically related inner and outer tubes. The closure occludes the inner tube. The fastener can be used for assembling children's products such as play-yards, strollers, swings, and other types of furniture, transports, and accessories.

Abstract: An axial compensator has a corrugated compensator tube extending along an axis and having a pair of opposite ends and respective pipe sleeves fixed to the ends and movable axially toward and away from each other with axial elastic deformation of the compensator tube. An inner guide tube fixed to one of the sleeves, generally centered on the axis, and projecting axially toward the other sleeve is formed with a plurality of radially outwardly projecting formations spaced axially from the one sleeve and defining respective radially outwardly open gaps. An outer guide tube fixed to the other of the sleeves, generally centered on the axis, and telescopingly engaging the inner guide tube is formed with radially inwardly projecting formations spaced axially from the one sleeve, defining respective radially outwardly open gaps, and aligned axially and engageable axially with the inner-tube formations. The gaps have an angular dimension at least as great as an angular dimension of the formations.

Abstract: A flexible tube for an automobile exhaust system which has a bellow assembly to absorb the first exhaust pipe and the second exhaust pipe for the an exhaust system having a cylindrical outer cover (5) made of plate to cover the outer periphery of the bellows (3)1 the first collar (7') and the second collar (7") with the risers (7a', 7a") bent toward the inner surface (5a) of the outer cover (5); the first elongation displacement stopper member (6') and the second elongation member displacement stopper member (6") respectively formed by bending the inner side of the outer cover (5); and the first elastic stopper member (8') and the second elastic stopper member (8") provided at the risers (7a', 7a") of both collars (7', 7"). As a further modification, the second outer cover (9) may be provided inside of the outer cover (5) to form displacement stoppers (9a, 9b) by bending the both end portions of the second outer cover.

Abstract: A compressor device, more particularly a two-stage compressor device (1), consists of a low-pressure compressor (4), a first compartment (7) of a cooling part (6) connected to the low-pressure compressor (4) by a first flexible connector (21), a high-pressure compressor (5) which is connected to the exit (11) of the first compartment (7), a second compartment (8) of the cooling part (6) which is connected to high-pressure compressor (5) by a second flexible connector (22), and a conduit (15) which is connected to the exit of the second compartment (8) for the discharge of the compressed gas. Flexible connections (21-22) are situated at opposite sides of a compression part (3) formed by the low-pressure compressor (4) and the high-pressure compressor (5), such that flexible connectors (21-22) extend substantially opposite each other. The arrangement of flexible connectors (21-22) in compressor device (1) avoids the transmission of movements and vibrations from compression part (3) to cooling part (6).

Abstract: The invention relates to a device for the movable connection of pipe ends, particularly of motor vehicle exhaust systems, with a flexible pipe element, such as a metal bellows, hose or the like, and with damped, spring elastic elements acting between the connection ends of the flexible pipe element. Such a device must have a simple construction, but must on the one hand compensate the relative movements acting between said connection ends and on the other ensure the necessary restoring forces for restoring the pipe element to its central position. In such a device, the invention provides for the elements to be held in expanding fastenings of supports parts, so that the linear spring characteristic of the elements is progressively modified by the expanding fastenings.

Abstract: A conduit vibration decoupling device, particularly for exhaust systems of internal combustion engines, comprises a pair of axially spaced conduit connecting members connected with each other by a flexible, bellows-type connecting element, and a force transmitting means having at least axial elasticity for transferring forces between said conduit connecting members. The force transmitting means comprises a housing surrounding said. flexible connecting element and connected to at least one of the conduit connecting members by an articulated spring arrangement which comprises at least a pair of spring means circumferentially spaced from each other.

Abstract: A connecting means for an exhaust pipe of a vehicle includes a bellows member made of metallic material and cylindrically corrugated for absorbing the deformation force due to the expansion and contraction of the exhaust pipe, an interlock member spirally formed on the inside of the bellows member and having spiral grooves for absorbing the deformation force due to the expansion and contraction of the exhaust pipe, a braid member for surrounding the outside of the bellows member, a cap for pressing an end part of the braid member, and a fixing member for combining the end parts of the bellows member and the interlock member. The fixing member includes a ring-shaped intermediate member one end part of which is welded under one end part of the bellows member, and the other end part of which is extended to be overlapped with the end part of the interlock member and provided with spiral protuberances to be fitted into the spiral grooves of the interlock member.

Abstract: A high temperature rectangular exhaust duct expansion joint structure for securement to a high temperature gas stream and particularly, but not exclusively, a turbine engine exhaust duct. The support flange structure incorporated in the duct has a connecting flange which defines opposed side walls of the rectangular support flange structure. A T-shape radial web is connected to an outer surface of the connecting flange. The radial web has a vertical wall component and a transverse end component extending beyond opposed sides of the vertical wall component and is connectable to a flexible membrane of the joint structure. The support flange has reinforced corner sections wherein the connecting flange and the vertical wall component of the T-shape radial web are of increased thickness to reduce thermal stress in the corner sections and to effectively redistribute the stress in the support flange.

Abstract: The crossover tube conducts fluid from the exhaust nozzle of a gas turbine engine to a blind receiver mounted in the sidewall of the airframe when assembled and deployed and includes a rigidly affixed forward ball and joint and a ball attached to the ends of each of a pair of tubes mounted in telescopic relationship with a clip secured to the coverplate covering the ball at the forward end cooperating with a pair of end to end mounted coil springs surrounding the tubes to hold the crossover tube in an erect and extended position to be guided into the receiver of the sidewall when deployed. In another embodiment bellows are utilized in place of the coil springs to provent leakage of fluid flowing in the crossover tube.

Abstract: An expansion joint for connecting first and second fluid-carrying pipes comprising first and second annular couplings which are operably affixable to respective ones of the pipes. In a preferred embodiment the couplings include cylindrical bores of substantially the same diameter disposed relative to one another to form a passage for providing flow communication between the pipes. An annular bellows extends between the couplings for accommodating relative axial movement and angular misalignment between the pipes and is disposed radially outward of the passage to capture any fluid leaking between the interfacing surfaces of the couplings. A second cylindrical bore of a first one of the couplings engages an outer spherical surface of the second coupling to allow the second coupling to pivot in a manner which accommodates angular misalignment between the pipes.

Abstract: A flexible joint has a bellows, a first support cover connected with one end of the bellows, a second support cover connected with another end of the bellows, a pin fixed to the first support cover, a cap fixed to the second support cover, and a buffer member constructed of wire mesh and disposed between the first support cover in combination with the pin and the second support cover in combination with the cap. The buffer member includes two portions different in modulus of elasticity. Due to the structure, gap generation between the first support cover combined with the pin and the second support cover combined with the cap is prevented.

Abstract: This invention provides an expansion joint that uses a flexible sealing element in conjunction with a packed seal in a manner that allows a reduction in break-away forces and permits continued operation of the joint after a failure of the bellows or bellows attachment point. The expansion arrangement includes a flexible sealing element, usually in form of a bellows, and a containment chamber in communication with the exterior portion of the flexible sealing element or bellows and an interior portion of the packed seal. The containment chamber has an opening that permits relative movement between the ends of the expansion joint and is sealed by the packed seal. In the event of a bellows failure, the packing material acts to restrict or prevent leakage from the containment chamber to the outside environment. The packed seal is made of a combination of materials that provide packing friction coefficient of less than 200 lbs/in.

Abstract: An expansion joint for coupling two conduits in a manner allowing relative axial movement therebetween and including an external shell or housing receiving the ends of both conduits and receiving an end of at least one of the conduits in a manner allowing relative axial movement of the end of the conduit in the shell, a flexible metal bellows in the shell connected to the shell and to the end of the one conduit for allowing relative axial movement between the ends of the conduits and for providing a fluid seal between the interiors of the conduits and the end of the expansion joint which receives the one conduit, and characterized by a safety flow restrictor operatively associated with the shell and with the one conduit for restricting fluid flow out the end of the expansion joint which receives the one conduit in the event the bellows fails to maintain the afore-mentioned fluid seal.

Abstract: This invention provides an expansion joint that uses a flexible sealing element in conjunction with a packed seal in a manner that allows a reduction in break-away forces and permits continued operation of the joint after a failure of the bellows or bellows attachment point. The expansion arrangement includes a flexible sealing element, usually in form of a bellows, and a containment chamber in communication with the exterior portion of the flexible sealing element or bellows and an interior portion of the packed seal. The containment chamber has an opening that permits relative movement between the ends of the expansion joint and is sealed by the packed seal. In the event of a bellows failure, the packing material acts to restrict or prevent leakage from the containment chamber to the outside environment.

Abstract: A fail-safe bellows assembly eliminates the usual limit bolts and replaces them with a cylindrical guard that encircles the bellows element with its associated coupling flanges and interconnects said flanges so as to permit a limited safe magnitude of elongation and articulation. The guard is connected to one of said flanges, with a coupling or linking to the other flange that permits the desired safe freedom of movement. In one embodiment one of the flanges has the guard clamped to its periphery while the other flange couples to the guard with pins and apertures. Another embodiment uses pins projecting radially inwardly from the guard at one end, replacing the pins in the flange and cooperating apertures in the guard.In addition to the guards, an elastic sleeve is joined to the periphery of each flange with a fluid-tight seal, and a vent passage through one flange interconnects the inter-flange space with the exterior for safe discharge of any fluid escaping from the bellows element.

Abstract: The coupling comprises a sleeve which receives a pair of tubular elements thereabout. One of the elements is pinned to the sleeve, and the other has a restricted, axially-movable relationship with the sleeve. Terminal ends of the tubular elements are spaced apart, in a mutually confronting relationship, and have mounted thereto circular and resilient webs or discs. The peripheries of the discs are fastened together, and the discs resiliently flex to accommodate for expansion and contraction of the tubular elements.

Abstract: For decoupling an exhaust system while suppressing or damping motion and cutting down noise as far as possible, a flexible joint or articulation for the exhaust system of a motor vehicle has a flexible duct part with support parts joined with its ends for outer damping members. The flexible duct part is so designed that the support parts are overlapped on the outer side of the duct part forming pockets acting as housings for compacts of compressed metal wire for damping motion of the support parts in relation to each other.

Abstract: An aircraft duct gimbaled joint is disclosed which permits the ducting to be deflected when high pressure--high temperature gases, vibration and gravitational forces upon take off and during vertical climbs cause substantial expansion and movement. The gimbaled joint comprises two spaced apart end rings, each formed with a pair of perpendicular protruding lobes which are inserted into slots formed in the end face of a center ring. The protruding lobes of the end rings are pivotally connected to the center ring by pivot pins which are doubly supported by the inner and outer walls of the center ring. The lobes of the first end ring are rotated 90 degrees relative to the second end ring providing movement about a vertical and horizontal axis. The rings are sealed by a flexible bellows which fit over and enclose the center ring.

Abstract: A first sleeve is connected to a second sleeve by means of a bellows. Brackets are arranged at the mutual circumferential distance along the circumferences of the sleeves which brackets are welded to the first sleeve at an end section thereof. The opposite end section of the brackets rest slidingly on the second sleeve. A clamping ring extends around the second end sections of the brackets at an inclined surface area thereof. This clamping ring is pushed onto these inclined surfaces and urges the end sections of the brackets against the second sleeve. The limiting of the stroke of the compensator is provided by circumferential rings welded to the second sleeve. The relative rotation blocking means is an elongated profile member which is welded onto the second sleeve and contacts a respective bracket.

Abstract: The invention is directed to a coupling arrangement for pipe conduits thrh which a medium containing radioactive or toxic substances is conveyed. The coupling arrangement includes a first coupling unit mounted on the end of a first one of the pipe conduits. A conduit engaging assembly is mounted at the end of the second one of the pipe conduits and includes an inner conduit segment tightly connected to and aligned with the second pipe conduit. A tubular member is arranged in surrounding relationship to the inner conduit segment so as to be coaxial therewith. The tubular member has a forward free end facing toward the first coupling unit and a second coupling unit is mounted on the forward free end of the tubular member and is joinable to the first coupling unit.

Abstract: An expansion joint of the bellows type for installation between the end portions of two aligned pipes utilizes two stop members within the bellows being movable relative to one another and each being supported by opposite end portions of the joint for limiting the axial extension of the joint. Each stop member includes a tubular sleeve being fixed at one end to a respective end portion of the joint and a ring at the sleeve end opposite its attached end. When the joint extends axially a predetermined amount, the rings engage one another and prevent any further joint extension.

Abstract: An expansion coupling connecting a first pipe with a second pipe includes an imperforate expansion member having a first cylindrical end capable of fitting to and forming an impervious fluid seal with the first pipe and a second cylindrical end capable of fitting to and forming an impervious fluid seal to the second pipe. Integrally formed with and interspaced between the first and second cylindrical ends is an expandable, contractable bellows. A sliding sleeve fits over the expansion member and both protects it and prevents distortion of the bellows portion of the expansion member. The sliding sleeve has a first sleeve member, a portion of which connects to the first pipe and a portion of which extends over the bellows, and a second sleeve member, a portion of which connects to the second pipe and a portion of which slides over that portion of the first sleeve member located over the bellows. As the bellows expands and contracts the respective sleeve members slide with respect to each other.

Abstract: A first pipe or shaft-like structure having a first end is shown operatively connected to a second pipe or shaft-like structure having a second end in a manner whereby the first and second ends spaced from each other and in fluid communication with each other; a coupling apparatus or joint structure operatively interconnects the first and second pipes; the joint structure employs liquid filled resiliently deflectable first and second force transmitting members as inner connections respectively functionally interconnecting a rigid portion of the joint structure to a rigid portion of the first pipe and to a rigid portion of the second pipe.

Abstract: An exhaust pipe having an axial compensator is provided with means for preventing bending of the axial compensator. This means includes at least one sleeve which is secured to one of the parts of the pipe and a mandrel slidably received by the sleeve and secured to the other part of the pipe, so as to allow axial movement of the parts. Both sleeve and mandrel may be pivotally secured to the parts to allow adjustment in the angle of inclination relative to the axial compensator.

Abstract: A hermetic expansion joint employing an external bellows and means positioned within the bellows for limiting the relative axial displacements of the conduits being joined in both compression and tension. The expansion joint device has, located within the annular chamber defined by the bellows, a layer of compressible refractory material which bridges the joint between the conduits and a shielding tube which envelopes the compressible refractory material. The expansion joint device is further provided, on oppositely disposed fittings which connect the bellows to the conduits, with means for limiting the axial width of the joint.