US20140374994A1 - Secured in Place Gasket for Sealing Plastic Pipelines, Method of Manufacture and Method of Installation - Google Patents

Secured in Place Gasket for Sealing Plastic Pipelines, Method of Manufacture and Method of Installation Download PDF

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Publication number
US20140374994A1
US20140374994A1 US13/923,468 US201313923468A US2014374994A1 US 20140374994 A1 US20140374994 A1 US 20140374994A1 US 201313923468 A US201313923468 A US 201313923468A US 2014374994 A1 US2014374994 A1 US 2014374994A1
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United States
Prior art keywords
gasket
pipe
female
body portion
main body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/923,468
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English (en)
Inventor
Guillermo Monteil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
S&B Technical Products Inc
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S&B Technical Products Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by S&B Technical Products Inc filed Critical S&B Technical Products Inc
Priority to US13/923,468 priority Critical patent/US20140374994A1/en
Assigned to S & B TECHNICAL PRODUCTS, INC. reassignment S & B TECHNICAL PRODUCTS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MONTEIL, GUILLERMO
Priority to US13/952,779 priority patent/US9593787B2/en
Priority to AU2014281176A priority patent/AU2014281176B2/en
Priority to PCT/US2014/037493 priority patent/WO2014204592A2/en
Priority to MYPI2015704644A priority patent/MY185346A/en
Priority to PCT/US2014/037487 priority patent/WO2014204591A2/en
Priority to BR112015032119-4A priority patent/BR112015032119B1/pt
Priority to CN201480046164.6A priority patent/CN105492815B/zh
Priority to ES14813593T priority patent/ES2699580T3/es
Priority to EP14813593.2A priority patent/EP3011213B1/en
Priority to CA2916232A priority patent/CA2916232C/en
Publication of US20140374994A1 publication Critical patent/US20140374994A1/en
Priority to ZA2016/00466A priority patent/ZA201600466B/en
Priority to US15/092,174 priority patent/US10107427B2/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/025—Rolling sealing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
    • F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/03—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed in the socket before connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1459—Coating annular articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/108—Special methods for making a non-metallic packing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L17/00—Joints with packing adapted to sealing by fluid pressure
    • F16L17/02—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket
    • F16L17/025—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket the sealing rings having radially directed ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L17/00—Joints with packing adapted to sealing by fluid pressure
    • F16L17/02—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket
    • F16L17/03—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket having annular axial lips
    • F16L17/035—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket having annular axial lips the sealing rings having two lips parallel to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/0845—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of retaining members associated with the packing member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/091—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
    • F16L47/08—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14631—Coating reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2071/00—Use of polyethers, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2701/00—Use of unspecified macromolecular compounds for preformed parts, e.g. for inserts
    • B29K2701/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
    • B29L2031/265—Packings, Gaskets

Definitions

  • the present invention relates generally to sealing gaskets and sealing systems used for pipe joints in plastic pipelines in which a male spigot pipe section is installed within a mating female socket pipe section to form a pipe joint and, more specifically, to an improved gasket, simplified method of manufacture, as well as an installation method for installing a locked-in gasket within a preformed gasket groove in a section of pipe used to form a pipe joint.
  • Fluid sealing systems for plastic, fluid conveying pipes are used in a variety of industries.
  • the pipes used in such systems are typically formed from thermoplastic materials including polyolefins and PVC.
  • the spigot or male pipe end is inserted within the female or socket pipe end.
  • An annular, elastomeric ring or gasket is typically seated within a groove formed in the socket end of the thermoplastic pipe.
  • the gasket provides the major seal capacity for the joint.
  • Various types of sealing technologies have been employed to assure the sealing integrity of the pipe joint. It is important that the sealing gasket not be dislodged during the joint make up and that the gasket not become twisted or otherwise compromised in field applications. It is also important that the gasket not extrude out of the pipe groove under various pressure conditions.
  • a homogeneous rubber gasket was generally deformable, allowing it to be flexed or bent by hand, accepting inverse curvature, and inserted within a mating internal raceway formed in the female, belled pipe end.
  • the raceway in the female pipe bell end was pre-formed using a collapsible mandrel belling tool at the pipe manufacturing facility.
  • a prior art attempt to insure the integrity of such pipe joints involved the use of a pipe gasket having a first distinct body region formed of an elastically yieldable sealing material, such as rubber, bonded to a second distinct body region formed of a more rigid material, such as a rigid plastic.
  • the plastic region in some cases, reduced the rubber surface contact area, sometimes leading to problems in providing the needed sealing in all conditions, including high pressure, low pressure and cyclic surges.
  • Compatible materials were necessary when bonding the homogeneous rubber gasket body with the plastic reinforcing band. Poor bonding resulted in separation of the two elements.
  • the reinforcing band was subject to being misplaced and breakage in the two part system.
  • the prior art solutions failed to provide the needed joint integrity, often contributing to the complexity and expense of the manufacturing operation and field installation.
  • the Rieber system employed a combined mould element and sealing ring for sealing a joint between the socket end and spigot end of two cooperating pipes formed from thermoplastic materials.
  • an elastomeric gasket was installed within an internal groove in the socket end of the female pipe as the female or belled end was simultaneously being formed. Rather than utilizing a preformed groove, the Rieber process provided a prestressed and anchored elastomeric gasket during the belling operation.
  • the present invention has, as one object, to provide an improved pipe gasket for use in pipe joints which offers the advantage of a Rieber type seal, while allowing the gasket to accept inverse curvature, to be installed in a preformed groove by hand, either at the manufacturing plant or in a field operation.
  • Another object of the invention is to provide an improved gasket which is securely retained within a preformed pipe groove without the necessity of a separate retaining band.
  • Another object of the invention is to provide a reinforcing element that is not required to be bonded to the rubber element, hence creating the possibility of being made from a multitude of materials.
  • Another object of the invention is to provide such a sealing gasket with special reinforcing attributes which allow it to seal under a variety of pressure conditions without being twisted or extruded, or displaced during field assembly, and yet which can be installed by hand in the bell raceway.
  • the sealing gasket of the invention is a rubber/plastic secured-in design which is especially useful in sealing PVC pipes having bell ends made using collapsible mandrel tools.
  • the gasket is reinforced with a reinforcing element, or band, comprised of a series of wedges which are interconnected by a flexible ribbon.
  • the band is preferably imbedded within the rubber body portion of the gasket, avoiding the use of bonding elements.
  • the rubber element of the gasket provides the primary sealing capacity while the plastic element improves resistance to extrusion due to water pressure and displacement during field assembly.
  • the gasket accepts inverse curvature to allow easy installation in a pre-formed pipe bell raceway by hand. Once the gasket is installed, it works as a combined compression and lip seal. It is preferaby installed by the PVC pipe manufacturer and, once installed, is a secured part of the pipe.
  • the rubber portion of the gasket can be, for example, SBR, EPDM, NR, etc., combined with a hard plastic band.
  • a pipe sealing gasket which is designed for receipt within a groove provided within a female socket end of a thermoplastic pipe, the female socket end being designed to receive a mating male thermoplastic pipe end to form a pipe joint.
  • the gasket comprises a ring shaped elastomeric body having a main body portion formed of rubber which, when viewed in cross section, includes a leading nose region, a lower compression region and a trailing tail region. The leading nose region faces generally towards the female socket end of the pipe once the gasket is inserted within the pipe.
  • the leading nose region of the main body portion of the gasket is reinforced by a hard plastic band comprised of a series of wedges interconnected by a flexible ribbon, the hard plastic band being embedded within the leading nose region of the main body portion of the gasket during gasket manufacture.
  • the wedges spaced along the ribbon act to prevent extrusion and displacement of the gasket from the raceway provided in the female socket end of the thermoplastic pipe.
  • the main body portion of the gasket can conveniently be formed of a natural or synthetic rubber, for example, styrene butadiene rubber, ethylene propylene diene monomer rubber and nitrile rubber.
  • the hard plastic ribbon is formed of a synthetic plastic material having a durometer which is greater than the durometer of the main body portion of the gasket. The material is selected based upon its having sufficient rigidity to prevent extrusion and displacement in use, while being flexible enough to allow the gasket to accept inverse curvature during installation. The material chosen must also not be so rigid as to break while being flexed or bent.
  • the lower compression region of the gasket can be provided with a series of circumferential engagement ribs for engaging the mating male spigot pipe end.
  • the main gasket body has an outer bulbous region which can similarly be provided with a series of circumferential engagement ribs for engaging the female socket end of the pipe.
  • the main gasket body has a lower, primary sealing surface which forms a combination lip and compression seal region for the gasket.
  • the “lip” region is separated from the convex sealing surface and trailing tail portion of the gasket body by a V-shaped recess.
  • the V-shaped recess allows the lip region of the gasket body to bend inwardly as the mating male, spigot end of a mating pipe section encounters the primary sealing surface of the gasket.
  • the method includes providing a mold having a first mold face with a circumferential recess.
  • a hard plastic reinforcing element, the band is placed within the circumferential recess in the first mold face, the hard plastic band being formed as a series of wedges interconnected by a flexible ribbon.
  • the wedges each have a front edge, a rear edge and opposing side edges, as viewed in cross section, and wherein the opposing side edges slope evenly from the rear edges to the front edges thereof.
  • a second mating mold face is provided which is then united with the first mold face, with a rubber compound being injected into the mold recess.
  • Heat and pressure are applied to the mold to form a ring shaped elastomeric body having a main body portion formed of rubber which, when viewed in cross section, includes a leading nose region, a lower compression region and a trailing tail region.
  • the main body portion of the gasket is then cured with the hard plastic ribbon contained therein, whereby the leading nose region of the main body portion of the gasket is reinforced by the hard plastic ribbon.
  • FIG. 1 is an end view of a section of plastic pipe, partly broken away, and showing the bell end and raceway, with a gasket of the invention in place in the raceway, the male pipe section being position for insertion into the bell.
  • FIG. 2 is a perspective view of the sealing gasket of the invention, showing the hard plastic band with its wedges and associated flexible ribbon in dotted lines.
  • FIGS. 3-6 are simplified views of the steps of installing the hard plastic band within an associated mold, the mold thereafter being injected with rubber and heated and cured to make the completed gasket of the invention.
  • FIG. 7 is a side, partial cross sectional view of the gasket of the invention in place in the internal groove provided in the female bell socket pipe end, the direction of travel of the mating male pipe member being shown in dotted lines.
  • FIG. 9 is a top view of a portion of the gasket of the invention, showing the placement of the hard plastic band, the rubber portion of the gasket body being shown in phantom lines.
  • FIG. 10 shows the beginning step of the make up of a pipe joint with the male pipe end just beginning to make contact with the sealing gasket of the invention
  • FIG. 11 is a view similar to FIG. 10 , showing a completed pipe joint, with an external pressure force acting on the sealing gasket.
  • FIG. 12 is another view of the completed pipe joint, this time with the sealing gasket having an internal pressure force acting on the gasket.
  • FIG. 1 shows the gasket 11 of the invention in place prior to the assembly of a pipe joint.
  • the gasket 11 is installed within a raceway 13 provided within the belled end 15 of a female pipe section of thermoplastic pipe 17 .
  • the female pipe section 17 can be formed of any of a variety of commercially available thermoplastic materials, such as the polyolefin family including polyethylene and polypropylene as well as polyvinyl chloride and similar materials.
  • Thermoplastic pipes of this general type are used in a variety of industrial settings including water, sewage and chemical industries.
  • the belied end 15 of the thermoplastic pipe section has a mouth opening 19 which is engageable with a spigot end 23 of a mating male pipe section 25 to form a pipe joint.
  • the gasket receiving raceway 13 has been pre-formed in the pipe mouth opening 19 at the pipe manufacturing facility, as by using a collapsible mandrel belling tool.
  • the gasket 11 is shown in profile in FIG. 2 and in cross-section in FIG. 7 .
  • the gasket 13 is an annular, ring-shaped member having a main gasket body 28 formed of a flexible elastomeric material, such as a suitable natural or synthetic rubber.
  • the elastomeric material used to form the body 28 of the gasket will vary in composition depending upon the end application but may encompass a number of different natural and synthetic rubbers including, for example, styrene butadiene rubber (SBR), ethylene propylene diene rubber (EPDM), acrylonitrile-butadiene rubber (NBR), nitrile rubber, etc.
  • the main gasket body 28 includes an outer convex sealing surface 27 which, in this case, is provided with a series of ribs or serrations 29 .
  • the main gasket body also includes a lower, primary sealing surface 31 .
  • the primary sealing surface 31 is an evenly sloping face of the gasket body which forms a combination lip and compression seal region for the gasket.
  • the lip region is separated from the outer convex sealing surface 27 and trailing tail portion 30 by a V-shaped recess (shown generally as 33 in FIG. 7 ).
  • the V-shaped recess allows the lip region of the gasket body to bend inwardly as the mating male, spigot end of a mating pipe section encounters the primary sealing surface 31 of the gasket (see FIGS. 10-12 ).
  • the main gasket body 28 also has a leading nose region, designated generally as 35 in FIG. 7 which is initially contacted by the mating male spigot pipe end during the assembly of the pipe joint.
  • the leading nose region 35 faces generally towards the female socket end of the pipe once the gasket is inserted within the pipe.
  • the leading nose region of the gasket is reinforced by a hard plastic band 37 formed as a series of integral, spaced wedges (such as wedges 39 , 41 , 43 ) interconnected by a flexible ribbon 45 .
  • the wedges 39 each have a front edge 53 , a rear edge 55 and opposing side edges 57 , 59 .
  • the opposing side edges (such as side edge 59 in FIG. 10 ) slope evenly from the rear edges 55 to the front edges 53 thereof, as viewed in this cross section.
  • the gasket body can thus be thought of as having a rubber element and as having a hard plastic element, the hard plastic element serving as the reinforcing element for the gasket body.
  • the hard plastic band 37 is embedded within the leading nose region of the gasket during the gasket manufacturing operation.
  • the wedges 39 on the hard plastic band 37 act to prevent extrusion of the gasket from the raceway ( 13 in FIG. 1 ) provided in the female socket end of the thermoplastic pipe once a spigot end of a mating male pipe is installed to form a pipe joint.
  • the main body portion of the gasket is formed of a natural or synthetic rubber, such as a styrene butadiene rubber, ethylene propylene diene monomer rubber or nitrile rubber.
  • the durometer of the rubber used for the main gasket body may vary depending on the end application but will typically be in the range from about 40-70 Shore A hardness, preferably about 40-60 Shore A.
  • the hard plastic band 37 is formed of a synthetic plastic material having a durometer which is greater than the durometer of the main body portion of the gasket.
  • the synthetic plastic material used for the band is preferably a material which shows an appropriate stiffness for the application at hand while allowing flexing (accepts inverse curvature) during installation.
  • the band can have a higher durometer than the remaining main body portion of the gasket since it does not participate in the sealing function of the gasket to the same extent as the primary sealing region of the gasket.
  • Various hard plastic type materials may be suitable candidates for use as the hard plastic band. These materials include such materials as polypropylene, polyvinylchloride and various “engineered plastics.” For example, one such material is those hard plastics which fall into the family group of modified polyphenylene ethers (PPE). These commercially available materials have high heat resistance, making them suitable for injection or compression molding and are generally suitable for plastic/rubber composites.
  • PPE modified polyphenylene ethers
  • VESTORAN® is the registered trademark of Evonik Degussa GmbH for molding compounds containing poly-2,6-dimethyl-1,4-phenylene ether as polymeric constituent (polyphenylene ether, PPE, also referred to as PPO).
  • FIG. 3 shows one half of an injection molding die 47 of the type that will be familiar to those skilled in the relevant arts.
  • the first mold half has a first mold face 49 with a circumferential recess 51 .
  • FIG. 3 shows one half of an injection molding die 47 of the type that will be familiar to those skilled in the relevant arts.
  • the first mold half has a first mold face 49 with a circumferential recess 51 .
  • the hard plastic band 37 with its series of integral, spaced wedges interconnected by the flexible ribbon 45 is placed within the circumferential recess 51 . It will be appreciated that placing the wedges into the mold as discrete and individual elements would be very time consuming. However, because the teeth are interconnected by the flexible ribbon, they can easily be placed in the mold integrally, in a single step. This also assures the proper spacing of the individual teeth about the circumference of the gasket.
  • FIG. 5 shows the hard plastic band partially installed in the circumferential groove of the first mold face
  • FIG. 6 shows the band fully installed.
  • the first and second mold faces are then united and the moldable rubber compound is injected into the circumferential recess. In the known manner, heat and pressure are then applied to the mold to form a ring shaped elastomeric body.
  • the heat and pressure in the mold cures the main body portion with the hard plastic band embedded therein, whereby the main body portion of the gasket is reinforced by the hard plastic band, whereby hydraulic pressure due to fluid in the pipe acts upon the wedges on the hard plastic band to push the teeth into tighter engagement with the mating male and female pipe members to prevent extrusion of the gasket from the raceway provided in the female bell socket end of the thermoplastic pipe once a spigot end of a mating male pipe is installed to form a pipe joint and the pipe is conveying fluid.
  • the gasket body is reinforced to prevent extrusion under various fluid pressure conditions, as well as from being displaced during field assembly, it remains flexible enough to allow the gasket to be bent by hand and installed within a gasket receiving raceway provided within the belled end of a female pipe member.
  • the sealing gasket can be installed within the gasket receiving raceway by bending the gasket to temporarily transforms the gasket from a generally cylindrical shape to a generally elliptical shape, followed by placing the gasket within the gasket receiving groove and releasing the gasket, whereby the gasket returns to the generally cylindrical shape.
  • the method for installing a gasket of the invention allows a pipe gasket to be installed within a preexisting and preformed groove in a thermoplastic pipe. Once the gasket has been secured in position in snap-fit fashion, it is securely retained within the pipe raceway and resists axial forces tending to displace the gasket from the raceway. Because a gasket is inserted within a preformed pipe groove or raceway, the manufacturing and installation processes are simplified and made less costly. The design of the gasket also makes it possible to remove one gasket and reinstall another within a preformed raceway in the selected pipe end.
  • the gasket which is utilized in the process is simple in design and relatively economical to manufacture.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Gasket Seals (AREA)
  • Joints With Sleeves (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Joints With Pressure Members (AREA)
US13/923,468 2013-06-21 2013-06-21 Secured in Place Gasket for Sealing Plastic Pipelines, Method of Manufacture and Method of Installation Abandoned US20140374994A1 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US13/923,468 US20140374994A1 (en) 2013-06-21 2013-06-21 Secured in Place Gasket for Sealing Plastic Pipelines, Method of Manufacture and Method of Installation
US13/952,779 US9593787B2 (en) 2013-06-21 2013-07-29 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation
CA2916232A CA2916232C (en) 2013-06-21 2014-05-09 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation
BR112015032119-4A BR112015032119B1 (pt) 2013-06-21 2014-05-09 método de formação e método de instalação de uma junta vedada
PCT/US2014/037493 WO2014204592A2 (en) 2013-06-21 2014-05-09 Secured in place for sealing plastic pipelines, method of manufacture and method of installation
MYPI2015704644A MY185346A (en) 2013-06-21 2014-05-09 Secured in place gasket for sealing pipelines
PCT/US2014/037487 WO2014204591A2 (en) 2013-06-21 2014-05-09 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation
AU2014281176A AU2014281176B2 (en) 2013-06-21 2014-05-09 Secured in place gasket for sealing pipelines
CN201480046164.6A CN105492815B (zh) 2013-06-21 2014-05-09 管密封垫圈及其制造和安装方法
ES14813593T ES2699580T3 (es) 2013-06-21 2014-05-09 Método para instalar una junta
EP14813593.2A EP3011213B1 (en) 2013-06-21 2014-05-09 Method for installing a gasket
ZA2016/00466A ZA201600466B (en) 2013-06-21 2016-01-20 Secured in place gasket for sealing pipelines
US15/092,174 US10107427B2 (en) 2013-06-21 2016-04-06 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/923,468 US20140374994A1 (en) 2013-06-21 2013-06-21 Secured in Place Gasket for Sealing Plastic Pipelines, Method of Manufacture and Method of Installation

Related Child Applications (2)

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US13/952,779 Continuation-In-Part US9593787B2 (en) 2013-06-21 2013-07-29 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation
US15/092,174 Division US10107427B2 (en) 2013-06-21 2016-04-06 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation

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US20140374994A1 true US20140374994A1 (en) 2014-12-25

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US13/923,468 Abandoned US20140374994A1 (en) 2013-06-21 2013-06-21 Secured in Place Gasket for Sealing Plastic Pipelines, Method of Manufacture and Method of Installation
US15/092,174 Active 2033-09-15 US10107427B2 (en) 2013-06-21 2016-04-06 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation

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US15/092,174 Active 2033-09-15 US10107427B2 (en) 2013-06-21 2016-04-06 Secured in place gasket for sealing plastic pipelines, method of manufacture and method of installation

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US (2) US20140374994A1 (pt)
EP (1) EP3011213B1 (pt)
CN (1) CN105492815B (pt)
AU (1) AU2014281176B2 (pt)
BR (1) BR112015032119B1 (pt)
CA (1) CA2916232C (pt)
ES (1) ES2699580T3 (pt)
MY (1) MY185346A (pt)
WO (1) WO2014204591A2 (pt)
ZA (1) ZA201600466B (pt)

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US9903651B2 (en) * 2013-12-23 2018-02-27 Samsung Electronics Co., Ltd. Sealing member and substrate processing apparatus including the same
EP3106730A1 (de) * 2015-06-18 2016-12-21 REHAU AG + Co Rohr oder rohrformteil
US20160377178A1 (en) * 2015-06-25 2016-12-29 Evolution Engineering Inc. Method for sealing a gap sub assembly
US10295060B2 (en) * 2015-06-25 2019-05-21 Evolution Engineering Inc. Method for sealing a gap sub assembly
US10596751B1 (en) * 2015-08-04 2020-03-24 Mcwane, Inc. Method of manufacturing bell socketed plastic pipes
USD798423S1 (en) * 2015-12-21 2017-09-26 Ipex Technologies Inc. Pipe with extended bell portion
US10619779B2 (en) * 2016-05-11 2020-04-14 Mcwane, Inc. Restrained gasket for plastic pipes
US10663095B2 (en) * 2016-05-11 2020-05-26 Mcwane, Inc. Restrained gasket for plastic pipes
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US10288199B2 (en) * 2016-05-11 2019-05-14 Mcwane, Inc. Restrained plastic pipe joint and method of making same
US20170370505A1 (en) * 2016-05-11 2017-12-28 Mcwane, Inc. Restrained gasket for plastic pipes
US20190162342A1 (en) * 2016-05-11 2019-05-30 Mcwane, Inc. Restrained gasket for plastic pipes
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US10393296B2 (en) 2016-09-30 2019-08-27 S & B Technical Products, Inc. Sealing gasket with corrugated insert for sealing restrained or non-restrained plastic pipelines
AU2017334556B2 (en) * 2016-09-30 2022-09-08 S & B Technical Products, Inc. Sealing gasket with corrugated insert for sealing restrained or non-restrained plastic pipelines
US10655733B2 (en) * 2016-11-18 2020-05-19 Schaublin Sa Elastomeric seal having impact protecting protrusions
US20180142786A1 (en) * 2016-11-18 2018-05-24 Schaublin Sa Elastomeric seal having impact protecting protrusions
US20180245727A1 (en) * 2017-02-24 2018-08-30 S & B Technical Products, Inc. Sealing Joint for Low Pressure Pipe Systems and Method of Manufacture
US10876672B2 (en) * 2017-02-24 2020-12-29 S & B Technical Products, Inc. Sealing joint for low pressure pipe systems and method of manufacture
US20180283560A1 (en) * 2017-03-30 2018-10-04 General Electric Company Blowout prevention system including blind shear ram
US20180340642A1 (en) * 2017-05-23 2018-11-29 S & B Technical Products, Inc. Sealing Gasket with Specialized Reinforcing Ring for Sealing Plastic Pipelines
US20190353248A1 (en) * 2018-05-18 2019-11-21 General Electric Company Protection system with gasket for ceramic core processing operation and related method
US10830354B2 (en) * 2018-05-18 2020-11-10 General Electric Company Protection system with gasket for ceramic core processing operation and related method
US11287072B2 (en) * 2019-09-12 2022-03-29 S&B Technical Products, Inc. Lightweight sealing gasket for low pressure and non-pressure applications
USD986394S1 (en) * 2021-05-12 2023-05-16 S & B Technical Products, Inc. Pipe sealing gasket

Also Published As

Publication number Publication date
ZA201600466B (en) 2017-08-30
WO2014204591A2 (en) 2014-12-24
WO2014204591A3 (en) 2015-10-29
US10107427B2 (en) 2018-10-23
BR112015032119B1 (pt) 2021-02-09
CN105492815B (zh) 2017-09-29
MY185346A (en) 2021-05-07
ES2699580T3 (es) 2019-02-11
CN105492815A (zh) 2016-04-13
EP3011213A4 (en) 2017-02-22
EP3011213A2 (en) 2016-04-27
AU2014281176B2 (en) 2018-11-08
CA2916232C (en) 2018-02-13
AU2014281176A1 (en) 2016-01-21
CA2916232A1 (en) 2014-12-24
EP3011213B1 (en) 2018-08-29
US20160245436A1 (en) 2016-08-25
BR112015032119A2 (pt) 2017-07-25

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