Abstract: A gas distribution connector and a gas distribution manifold assembly are provided for gas burners for a gas stove. The gas distribution manifold assembly includes an elongated gas distribution manifold defining a gas distribution chamber. The gas distribution manifold includes a first aperture formed in a first wall and a second aperture formed in a second wall. At least one gas distribution connector is mounted on the gas manifold. The gas distribution connector includes a connector body defining a gas passageway including a gas inlet and a gas outlet. The connector body includes a downwardly depending connector body portion slidingly received through the first manifold aperture and extending within the manifold chamber, locating the gas outlet within the manifold chamber. The downwardly depending connector body portion includes mounting means for mounting engagement with a fastener received through the second manifold aperture.

Abstract: There is provided a common rail which can reduce a maximum stress value generated in an inner peripheral edge portion of a lower end of a branch hole and can further improve an internal pressure fatigue strength.

Abstract: A drain and inspection manhole for liquid conduits, in particular waste water and/or storm water drains, comprises a manhole section which is formed as a composite pipe having a smooth cylindrical internal pipe and a corrugated external pipe. The external pipe is deformed to comprise at least one connecting base with a marginal web. Apertures that are flush with each other are cut into the connecting base and the internal pipe, a connector being inserted in these apertures.

Abstract: To provide both a high-pressure metal piping capable of preventing the cavitation or the like or the internal fatigue destruction, as might otherwise occur at a joint head at a branch tube due to the repeated internal pressure of a fluid, and capable of eliminating a fear of corrosion even if a corrosive high-pressure fuel is employed, and a common rail to which the piping is jointed. At a joint portion of a thick steel tube having a relatively small diameter, a joint head is formed of a radially enlarged portion having a larger diameter than that of the thick steel tube, and the radially enlarged portion is formed on its inner circumference into a tapered pressure seat which is diverging outward for a receiving seat of the common rail. Preferably, a thin inner tube, as made of a corrosive metal, is fitted on the inner circumference of the thick steel tube all over the length and is terminated at the tapered pressure seat of the thick steel tube.

Abstract: A tapping sleeve assembly for direct connection to a gate valve. The assembly includes a tapping sleeve attached to a main pipe. An outlet conduit formed integrally with and extend outwardly from the tapping sleeve terminates in a distal end outlet. A retaining ring is attached to the outer surface of the outlet conduit and is located between the tapping sleeve and the distal end outlet. Opposed, longitudinally facing annular surfaces are formed on the retaining ring with one of the annular surfaces facing the tapping sleeve and the other facing the distal end outlet. The annular surface facing the tapping sleeve is inclined. A gland telescopes over the outlet conduit. The gland has a collar with an annular surface engaged with an annular surface of the retaining ring. A gate valve has a socket facing the outlet conduit, a gasket is positioned in the socket and a mechanical joint flange surrounds the socket. Bolts and nuts attach the gland to the mechanical joint flange of the gate valve.

Abstract: In a piping system having a main pipe or fitting joined to a lateral pipe, a restraint body or sling extends about the fitting or main pipe and is secured at opposite ends to the lateral pipe. The lateral pipe, main pipe or fitting and restraint body are formed of plastic material. The restraint body includes a bend intermediate its ends for wrapping about the fitting or main pipe and has arcuate sections at its ends for solvent-welding to the lateral pipe. Any tendency toward separation of the lateral pipe and the main fitting or main pipe is resisted in tension by the restraint body and the joint is stress-relieved.

Abstract: The present invention comprises an improved method and apparatus, associated with a self-piercing valve assembly for mounting the self-piercing valve on a pipe and for constraining movement of the valve on the pipe. In accordance with a preferred embodiment of the present invention, a self-piercing valve assembly comprises a clamping assembly and a crimping member associated with the clamping assembly, which crimping member "automatically" crimps a pipe and forms a recess therein when the self-piercing valve clamping assembly is tightened about the pipe, and simultaneously effects a crimping member/recess interface (much like a key-and-keyway interface) which inhibits relative angular rotation between the pipe and valve. The crimping member is, preferably, a rigid, projection or tab.

Abstract: A by-pass level indicator includes a main tube in communication with a tank via a pair of by-pass tube members, a float containing a magnet and an indicator attachably mounted to the main tube and having a series of magnetic colored flags reacting with the magnet of the float for indicating level of the tank. Each of the by-pass tube members includes a T-joint having an upright tube receivably engaging with one end of the main tube and a transverse tube integrally extending from the upright tube communicating the main tube to the tank. The transverse tube has a male threaded end portion to partly receiving an O-ring. The by-pass tube member further has a combination of a union and a collar adapted to communicating the transverse tube with the tank. The collar is threadingly engaged with the male threaded end portion of the transverse tube and clamps a connecting tube of the union to the transverse tube simultaneously compressing a protruding portion of the O-ring, thereby achieving a fluid-tight seal.

Abstract: A fitting for coupling a service line to a polyethylene fluid distribution pipe such as a water main or a gas main includes a stub length of polyethylene pipe that serves as a base for attaching a corporation stop valve. The cross section of the open base end is machined to match the curvature of the outside surface of the main pipe and then fused into the sidewall of the main. The corporation stop valve can then be used for hot tapping polyethylene mains.

Abstract: A pipe tapping valve which can be connected, for example by welding, with a pipe which is to be tapped, and which includes a support stub (4) in which a drill bit (26) is disposed for axial movement, and with which a branch nipple (12) is connected. The pipe tapping valve is configured so that the drilling of the tube can be safely performed with little difficulty, while a seal satisfying the requirements of the particular application is provided both during the drilling and after the drilling has ended. The support stub (4) has a substantially smooth cylindrical inside surface; the drill bit (26) contains at its upper free end an expansion (30) or a sealing ring (54) in contact with the inner surface (34) of the support stub (4), and the drill bit (26) is axially movable by means of a drilling tool (36) attachable to the support stub (4).

Abstract: The invention relates to a connection device for a liquid or gaseous medium through an outer wall of a cylinder, whereby a connection piece interacts with a bore in the outer wall of the cylinder and with a centering part that is inserted into the bore. The connection piece has a contact surface matched to the cylinder surface and also has a corresponding sealing surface. The connection has an accommodating cavity for receiving an insert, which includes a sealing surface matched to the cylinder surface, The correct installation position of the insert in the accommodating cavity is ensured by an orientation aid.

Abstract: A fitting assembly and method for attaching to a fluid flow conduit in which a clamp having a threaded port is secured around the conduit. A threaded bushing is inserted into the threaded port and has an axial bore that guides and supports a tool which is inserted through the bore to pierce the corresponding surface of the conduit. After the tool and the bushing are removed from the threaded port, an external component, such as a sensing unit, can be connected to the port to permit access to the fluid for sensing a flow characteristic of the fluid, or the like.

Abstract: An improved oil filter unit for attachment to a bight portion of a "J" tube of an accumulator dehydrator includes a rigid, preferably metal pick-up tube or projection. The rigid projection prevents collapse of an extension of a disk held by the oil filter unit during assembly of the oil filter unit to the aperture in the "J" tube. The rigid projection also includes an extended lower end which extends closer to the bottom of the accumulator to allow less oil to be in the accumulator for lubricating the compressor of the air-conditioning system, thereby realizing a significant cost savings compared to prior art accumulators.

Abstract: A rust-resistant cylindrical metal sleeve for preventing rust and corrosion from developing around the wall of a branch hole when the sleeve is rigidly fitted into a branch hole that is drilled through the wall of a metal conduit such as a water pipeline. The sleeve has a projecting portion on its outer circumference and an inner flange portion inwardly projecting at its lower end. The metal sleeve on its outer circumference is coated with a water-absorbing swelling rubber into which a synthetic resin rubber and a water-absorbing polymer are blended. Preferably, 100 parts by weight of styrene-butadiene rubber or ethylene-propylene-dienemetylene linkage rubber is blended with 10 to 40 parts by weight of the water-absorbing polymer. Since the water-absorbing swelling rubber increases its volume as it absorbs water, pressure in the rubber increases, preventing water ingress through between the metal sleeve and the wall of the branch hole.

Abstract: A joint structure for a branch connector in a common rail, comprising: a main pipe rail having a conduit therein on its axis and a plurality of through holes formed in its circumferential wall at an axial spacing, each of the through holes having a pressure receiving seat formed on the circumferential face thereof and opened to the outside; a branch connector having a conduit to communicate with the conduit of the main pipe rail and including a joint head formed at the end thereof and forming a pressure seat so that the branch connector is engaged with the main pipe rail by bringing the pressure seat thereof into abutment against the pressure receiving seat of the main pipe rail; a joint fitting mounted on the main pipe rail; and a nut assembled in advance in the branch connector and fastened into the joint fitting against the pressure of the joint head thereby to joint the branch connector to the main pipe.

Abstract: The present invention provides a saddle-less fitting having a stepped outer wall surface. The stepped outer wall surface includes a first and second surface and a step. The step includes a first bowed band surface extending from the first outer wall surface a predetermined distance inward towards the inner wall surface. The fitting further includes an insertion portion which includes the second outer wall surface and a second bowed band surface. The first bowed band surface and the second surface are bonded to a prepared pipe with a bonding agent. A more liberal application of the bonding agent may be employed to cause the other fitting and pipe surfaces to further bond together. Once the bonding agent hardens, or becomes cured, a unitary structure is formed which provides a leak-free tap.

Abstract: A heat exchanger includes at least one elongate header of metal, a plurality of refrigerant flow tubes each having one open end exposed to the interior of the header and a plurality of heat radiation fins extending along the tubes. A connector of metal is brazed to the header to provide a fluid communication between the interior of the header and an external pipe member through an opening formed in a wall of the header. The connector comprises a mating surface which mates the wall of the header; a connecting surface positioned at an opposite side of the mating surface; a pair of side surfaces each being positioned between the mating and connecting surfaces; a through bore which extends between the mating and connecting surfaces; and a groove formed in each of the side surfaces along an axis of the elongate header. The groove is positioned close to the mating surface to leave or define therebetween a thin mounting portion of the connector.

Abstract: A second tubular portion, having a closed distal end, is formed at an inner surface of a connector block constituting the joint portion. A threaded hole, which is open to an outer surface of the connector block, is formed in the tubular portion. A bolt is threaded into the threaded hole to fix a piping joint to the connector block.

Abstract: A connecting construction of a branch pipe is disclosed.

Abstract: For nozzle replacement, repair and initial installation in ASME pressure vessels, disclosed are nozzles, nozzle assemblies and nozzle repair assemblies, all of which are mechanically attached and mechanically sealed to the vessel, i.e., without any welding to the vessel, and in most embodiments without any welding at all. For nozzle replacement, a part or the entire existing nozzle is removed and a partial or full replacement nozzle or nozzle assembly is mechanically attached and mechanically sealed to the vessel. For nozzle repair, the existing nozzle within the bore is not removed, and a mechanical seal is provided for the existing nozzle which may also be welded or mechanically attached to the repair assembly.

Abstract: One or a plurality of valve-operated branch pieces can be attached to any point of any pipe. To this end, two opposite openings (16, 18) are made in the pipe (10), and a branch valve body is clamped about the pipe in bracket-like manner at the prepared site.

Abstract: A pipe fitting adapted to be installed in an aperture in a wall of a fluid container, comprises inner and outer co-axial sleeve members interconnected for relative axial movement and a split, helically wound, washer. The inner sleeve member has an end portion insertable through the aperture, and the outer sleeve member has an annular bearing surface adjacent to the end portion adapted to overlie a first one of two opposed surfaces of the wall around the periphery of the aperture. The split washer is retained to and extends around the end portion opposite the bearing surface, and is of larger outer diameter than the aperture but is insertable therethrough by winding so as to overlie the second of the opposed surfaces of the wall.

Abstract: A compact hot-tap saddle pipe fitting made of weldable plastic material integrates a branch saddle and a tubular adapter into a monolithic tee shaped unit. The fitting, which is characterized by short overall dimensions and a reinforced base portion, allows a fully pressure rated connection of a branch line to a main plastic pipeline using an isolation valve and a standard size hot-tap cutting tool.

Abstract: A reverse pulse cleaning system for use in a bag house filter including a blow tube (2) having outlet holes (3) to direct high velocity air pulses into filter bags to be cleaned. The systems includes a nozzle (1) having a control formation between the inlet and outlet ends of the nozzle. The control formation determines air flow characteristics such as velocity and direction of flow emerging from the outlet holes (3) and can improve uniformity and effectiveness of filter bag cleaning. A clampable and releasable fixing of the nozzle (1) to the blow tube allows replacement of the control formation with one of different characteristics during manufacturing or insitu fine tuning. The fixing allows the precise alignment of nozzles (1) on assembly which reduces the need for costly precision in forming the blow tube outlet holes (3).

Abstract: An improved air diffuser and mounting arrangement for mounting diffusers on submerged air laterals in a wastewater treatment system. The diffuser is formed form a cylindrical pipe which is flattened on most of its length but left partially cylindrical for convenient mounting. The mounting arrangement includes a removable saddle on the air lateral and a Tee fitting for mounting the diffusers. The saddle has an outlet spout which fits directly against and is connected directly to an inlet leg of the Tee fitting. The saddle construction in one form accommodates either standard U.S. or metric pipe fittings and in another form accommodates two different sizes of pipe fittings.

Abstract: A hot tap connection comprising: (i) a main supply pipe, (ii) a side branch pipe connected to the main supply pipe, (iii) a reinforcing saddle surrounding the main supply pipe and the side branch pipe, (iv) a first gap between the main supply pipe and the reinforcing saddle, (v) a second gap between the side branch pipe and the reinforcing saddle, and (vi) a solid material substantially filling the first gap and the second gap. The method for producing the hot tap connection is also described.

Abstract: An apparatus for piercing a hole in a tube centered on a tube axis has a plurality of housing parts one which is formed with a throughgoing threaded passage centered on a passage axis and both of which are secured the housing parts around the tube with the passage axis extending generally radially of the tube axis. A tool body threadable into the passage is formed with a blind bore generally centered on the passage axis, open radially inward of the tube axis toward the tube, and having an end wall directed radially inward of the tube axis toward the tube. A straight hard metal needle in the bore has a pointed inner end directed radially inward of the tube axis at the tube and an opposite outer end confronting the end wall of the bore. The outer needle end is centered by appropriate formations in the bore on the passage axis and the outer needle end is braced radially outward of the tube axis against the bore end wall.

Abstract: A joint for a fluid transport pipe is provided for use in e.g. connecting and communicating a fluid piping device such as a branch pipe or a sluice valve to a through bore defined in a fluid transport pipe. The joint includes a joint body, to be connected to a fluid transport pipe. This joint body has a cylindrical connecting portion projecting therefrom. The cylindrical connecting portion includes a fixed cylindrical member formed integrally with the joint body and a movable cylindrical member fluid-tightly connectable to the fixed cylindrical member to be pivotable three-dimensionally relative thereto.

Abstract: A device for cutting off the flow in a conduit for fluids, consisting of a sluice (2), transversely arranged in a conventional conduit for fluids (1) between two flanges (3), one or two flanges (3) being fitted with a tab (6), a hole and axle (7) around which the sluice (2) turns according to a circular motion establishing fluid cut off or flow positions. In an alternative embodiment of the invention for performing connections under pressure, a mounting is provided on the conduit, constituted of a tubular assembly consisting of a reel (9) and a seat (10), which is fastened to the conduit by means of straps (11), a sluice (15) is inserted between the tubular assembly and the reel.

Abstract: A method for attaching an interduct to a duct by forming a groove on an outer surface of the duct and pressing out that portion of the duct encompassed by the groove to form an opening in the duct. A saddle is then attached to the duct and the interduct the attached to the saddle. The apparatus used for forming the opening in a duct comprises a template having an arcuate portion with a radius substantially the same as the duct. The template has a window portion having substantially the same shape as the opening to be formed in the duct. A base plate is provided having an arcuate portion with a radius substantially the same as the radius of the arcuate portion of the template such that the base plate is slidably fittable over the template. A cutting device is attached to the base plate and has a cutting element extending through the base plate.

Abstract: A tapping fitting for application to a pipe in order to tap a fluid conducted therethrough to an ancillary device includes a housing having a rotatable blade assembly threadedly received within the housing main section and including a cylindrical cutting blade at its inner end such that rotation of the blade assembly cuts a cylindrical slug from the pipe when attached thereto. The device further includes a hollow stem having an inner end secured to the rotatable blade assembly and an outer end for receiving a key to rotate the hollow stem and the blade assembly from an initial retracted position to a projected position and then to a final retracted position. A seal between the outer surface of the hollow stem and the housing main section seals the interior of the pipe from the external side of the housing both during and after the cutting of the cylindrical slug from the pipe.

Abstract: An all plastic spray nozzle attachment is provided to avoid corrosion problems, with a self-adjusting fastener system which minimizes or avoids bending stresses on the securement screw that joins the free ends of the two hinged clamp arms that embrace the support pipe. Both the head and nut ends of the screw and the respective abutting surfaces of the clamp arms are provided with arcuate abutment surfaces which permit rocking movement of the head and nut portions about axes generally parallel to the longitudinal axis of the support to readily maintain the head and nut in coaxial alignment with one another, thereby relieving bending stresses on the screw shank as the fastener is tightened to draw the arms toward one another into clamped position.

Abstract: A one-piece saddle tee for installation on a fluid line such as an irrigation line. The saddle tee has a clamp includes a pair of opposing clamp segments having upper, lower and intermediate portions with at least one of the segments being hinged along its intermediate portion to one end of the base. The other of the segments is attached to the other end of the base. Each of the segments has a locking part at its lower end portion cooperating with a locking part of the other of the segments, the locking parts interconnecting the clamp segments when the clamp is pressed onto the line. A coupling tap may be used for punching a hole in the line. Coupling tap is secured to the line with saddle tee.

Abstract: An adaptor (1) and method for fitting or replacing a branch-off connection in a fluid distribution main in which the adaptor (1) is inserted into a hole in the wall of the distribution main, the adaptor (1) comprising a rigid body (2) with an internal bore (3) therein, the internal bore (3) being closed with a displaceable blocking element (10), and a service pipe (16) is inserted into the internal bore (3) of the adaptor (1) so as to displace the blocking element (10) and open the internal bore (3) of the adaptor (1).

Abstract: The present invention comprises method of measuring a parameter of a multiphase flow of a fluid and apparatus therefore. The apparatus comprises a buffer chamber apparatus that is operably fluidly coupled to a pipe bearing a fluid comprised of components of different densities. The buffer chamber apparatus has structure that defines a substantially fluid tight chamber that is in flow communication with the fluid borne in the pipe. One or more ports are defined in the chamber structure whereby the fluid in the chamber may be selectively accessed for sensing a parameter of the fluid. The fluid in the chamber resides in a substantially stable state promoting the separation of the different density components of the fluid.

Abstract: Siphon freeze drain valve for an underground water sprinkling system including a line operating under water pressure, the drain valve being a U-shaped tube, one end of which is passed through a hole in the top of the line, the other end of which is outside the line at a lower level than the first end. A clamp and a seal holds the tube in the line against the force of the water in the line and prevents leaking around the tube. A check valve is in the end of the tube outside the line, the check valve selectively opened and closed to control flow through the tube and for establishing a siphon for draining the line.

Abstract: A tapping device and method are provided for tapping tubing. The device comprises a tube portion which substantially encloses a tube, a spring portion which provides a clamping force to the tube portion, and a guide portion which guides and supports tube piercing instruments and taping fixtures. In normal operation, a section of tubing is inserted into the tube portion and the spring portion is pressed together to create a clamping force in the tube portion. Locking members are provided for maintaining the spring portion in a force producing position. Tube piercing instruments and tapping fixtures may then be inserted in the guide portion. The device ensures that the instruments and fixtures are inserted in the correct orientation and the device helps prevent leaks from occurring.

Abstract: The invention disclosed herein provides nozzles for vessels such as a pressurizer vessel, reactor vessel or piping in a nuclear power facility, and methods for attaching and sealing the nozzles to the vessels without any welding at all, i.e., without using a structural or seal weld. The nozzles are clamped or bolted to the vessel or attached by an interference fit, and a mechanical seal is obtained using gasket material and/or contacting, preferably polished, metal surfaces. Some embodiments of clamping the nozzle to the vessel comprise tightening a nut on the threaded end of the nozzle projecting from the bore in the vessel against the vessel, and structure which prevents the nozzle from being withdrawn through the bore, thereby clamping the nozzle against the vessel. Another embodiment of clamping a nozzle to the vessel comprises a sleeve threaded in the bore and forcing an interfering portion of the nozzle body into engagement with the bore.

Abstract: A sealing gasket for a segmented pipe coupling includes radially extending, axially spaced sealing lips interconnected by an axially extending bridge member which has at least one aperture extending through the bridge member in a radial direction, a tubular collar being received within the aperture, the tubular collar being fast with an arcuate elongate plate, the longitudinal edges of which are engaged with mutually presented surfaces of the sealing lips.

Abstract: A molded connector for producing a branch connection for a pipeline has two heating windings which are connected to each other and by means of which the weld connection between the pipeline and the molded connector as well as the inserted molded branch part or a pipe is produced simultaneously.

Abstract: There is disclosed a clamp useful for connecting a tie-in line transversely to a carrier pipe, comprising: a lower body portion and a upper body portion that when connected together define a tubular bore, the lower and upper body portions being adapted to clamp onto the carrier pipe; a set of gripping collets positioned with the tubular sleeve bore proximate opposed ends of the upper and the lower body portions to engage such a carrier pipe; a branch tap positioned between the gripping collets and extending from one of the body portions transversely to the tubular bore; a first seal and a second seal for providing a seal between the carrier pipe and the upper and the lower body portions, the first and second seal positioned within the transverse bore and between the gripping collets and the branch tap; and a set of axial seals to form axially extending seals between the upper and lower body portions during use and to connect the first and second seals during use.

Abstract: A branch connector is provided for coupling a main pipe having a liner disposed therein with a service line and for simultaneously sealing the interface between the edges of the main pipe and the liner. The connector includes an outer hollow housing adapted for coupling to a service saddle, the outer housing having a first aperture for placement adjacent to the outer wall of the main pipe and a second aperture adapted for connection to the service line. An inner sealing assembly is adjustably mountable inside of the housing such that the assembly may be axially extended through the first aperture and into the interior of the main pipe. A lower, outer portion of the sealing assembly bears a seal for secure engagement against the liner and the main pipe, closing the interface therebetween.

Abstract: A tapping fitting for a pipe, preferably a plastic pipe, includes a rotatable blade assembly threaded within a sleeve non-rotatably received within a housing such that rotation of the blade assembly causes it to cut a cylindrical slug from the pipe to which the housing is attached. The opposite faces of the sleeve are exposed to the fluid pressure within the pipe thereby producing a balance of forces substantially eliminating transverse creep. In addition, the attaching section of the fitting is formed with a bore which is engageable by a sealing ring received around the rotatable blade assembly and which is of sufficient length to accommodate any axial creep, thereby enabling the blade assembly also to serve as a valve.

Abstract: A hot-tapping sleeve is provided for tapping a main pipe and attaching a branch pipe. The tapping sleeve includes a split sleeve having first and second sleeve members which together form a circular bore for receiving a portion of the main pipe. The first and second sleeve members each form approximately one half of the circular bore. A plurality of clamping members pass through associated holes in the first and second sleeve members to clamp the first and second sleeve members together with the main pipe therebetween. A side branch is attached to the first sleeve member which has an opening in fluid communication with the circular bore. A sheet type packing member is located around the opening and is only between the first sleeve member and the main pipe. A metal spray is located on the second sleeve within the circular bore and engages the main pipe for resisting axial displacement of the main pipe to permit tapping of the main pipe while the main pipe is under fluid pressure.

Abstract: A fixture includes a hollow body adapted to be secured in an opening of a tub by a ring nut which is screwed to the body in such a manner that the wall of the tub is clamped between the hollow body and the ring nut. A ring is mounted on the body so as to cover an outer edge of the body defining the periphery of the end surface. The ring has a front wall that covers the end surface of the body and is to be situated between the end surface and the wall of the tub. The hollow body is also provided with a vent through-hole and a second through-hole extending from a recess in the end surface of the body. Sealant can be injected through the second through-hole into the spaces delimited by the boy, the ring and the wall of the tub.

Abstract: A single piece duct fitting of generally cylindrical configuration for attachment to a large cylindrically-shaped flexible duct having a curved, easily deformed sidewall in which a hole has been created. This novel duct fitting is constructed of deformable sheet material that, before being assembled into a cylindrical configuration, was defined by an elongate sheet of material having a long edge of a generally sinusoidal configuration, with a plurality of short lateral slots defining teeth in this long edge. A pair of relatively closely spaced curves of generally sinusoidal configuration are disposed adjacent the teeth, which curves bear a closely aligned relationship with the first long edge of generally sinusoidal configuration. A plurality of evenly spaced slits extend between the pair of sinusoidal curves, with these slits defining a plurality of substantially identical tab members intended to bend outwardly when lengthwise compression is applied to the duct fitting.

Abstract: A heat exchanger comprises a main body and at least one header-held members, with the main body having a plurality of heat exchanging tubes whose both ends are connected to headers in fluid communication with them, wherein the header-held members are selected from a group consisting of a bracket and an external pipe-connecting member which are attached to the header. The header-held members each comprise a header-surrounding portion which is fitted sideways on and then brazed to the header while remaining self-retained on it, whereby the header-held member can be easily and rigidly secured to the header.

Abstract: An improved supply line fitting, installation method and technique for direct installation in the supply lines of a distribution system. An angularly flanged, resilient insert barb being force fitted into an opening in a supply line, seals the opening at three points upon being compressed by an external sealing washer and locking assembly. The locking assembly utilizes an intermediate pressure plate for smooth, distortion free compression, providing a positive internal and external seal of the supply line, and locks the fitting at any point along it's 360 degree rotational axis in preparation for interconnection to a final output device.

Abstract: A saddle type pipe joint for construction of branching connections, composed of a saddle-shaped main pipe-connecting part and a cylindrical branching pipe-connecting part. The two parts are integrally molded by a reaction molding, composed of a shape-memorized plastic resin, and have on the inner surfaces a fusion-bonding plastic resin layer containing a conductive filler. The pipe joint is made by polymerising a reactive liquid stock for a shape-memorizable plastic resin in a mold using a core made of a fusible plastic resin containing a conductive filler; cutting the main pipe part of the molded composite article along its length at the side opposite to the branching pipe-connecting site; and opening side edges of the thus-cut main pipe. The construction of branching connections is carried out by utilizing the restoration of the shape-memorized plastic resin to the original shape.

Abstract: A heat exchanger comprises a main body and at least one header-held members, with the main body having a plurality of heat exchanging tubes whose both ends are connected to headers in fluid communication with them, wherein the header-held members are selected from a group consisting of a bracket and an external pipe-connecting member which are attached to the header. The header-held members each comprise a header-surrounding portion which is fitted sideways on and then brazed to the header while remaining self-retained on it, whereby the header-held member can be easily and rigidly secured to the header.