WO2007101456A1 - A valve unit, in particular for gas - Google Patents

A valve unit, in particular for gas Download PDF

Info

Publication number
WO2007101456A1
WO2007101456A1 PCT/EP2006/005890 EP2006005890W WO2007101456A1 WO 2007101456 A1 WO2007101456 A1 WO 2007101456A1 EP 2006005890 W EP2006005890 W EP 2006005890W WO 2007101456 A1 WO2007101456 A1 WO 2007101456A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve unit
leak
pipe
coupling member
gas
Prior art date
Application number
PCT/EP2006/005890
Other languages
French (fr)
Inventor
Giovanni Balladore
Stefano Zanella
Original Assignee
Sit La Precisa S.P.A.
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 Sit La Precisa S.P.A. filed Critical Sit La Precisa S.P.A.
Publication of WO2007101456A1 publication Critical patent/WO2007101456A1/en

Links

Classifications

    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
    • F16L19/028—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall
    • F16L19/0283—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall and having a bell-mouthed shape
    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges

Definitions

  • a valve unit in particular for gas Technical field
  • the present invention relates to a valve unit, in particular for gas, having the characteristic features set out in the preamble of the main claim. Technological background
  • the invention is of particular, but not exclusive, application in the particular sector of leak-tight connection systems for valve units adapted to supply combustible gas to fires or like heating appliances.
  • connection system entails, for the connection of each supply and delivery pipe, the use of a respective male coupling member, otherwise known as a nipple, provided with a first threaded section which can be screwed into the threaded seat of the valve body and a second threaded section which can be screwed into a ring nut or pipe-fastener nut.
  • a sealing gasket is normally provided between the ring nut and the nipple, although this seal may also be obtained by flaring the free end of the pipe and locking (by means of the ring nut) this end against a conical surface provided at the end of the nipple, on the side of this pipe.
  • This leak-tight connection system is normally provided both the gas supply and delivery pipes of the valve unit and thus requires the use of a pair of nipple members for each valve unit, in addition to the fact that the connection requires the two threaded sections of each nipple to be screwed into the corresponding nuts. Disclosure of the invention
  • the object of the invention is to simplify the leak-tight connection system for valve units of the type described above, reducing the number of components as well as operations to ensure the leak-tight connection of the gas pipes to the valve unit, thereby reducing costs and times, while providing an equally reliable gas-tight system.
  • Fig. 1 is a perspective view, with members detached, of a leak-tight connection system provided in a valve unit in accordance with the present invention
  • Fig. 2 is a partial view in axial section of the valve unit of Fig. 1, with the members of the leak-tight sealing system assembled.
  • valve unit of the present invention is shown overall by 1 and is adapted to be connected in a leak-tight manner to corresponding gas supply and delivery pipes shown respectively by 2 and 3.
  • the pipes 2 and 3 are connected to the valve unit at the location of a first and a second coupling, both shown by 4, only one of which will be described in detail below as the other is structurally identical.
  • Each coupling 4 is of the threaded engagement type and comprises a respective male coupling member 4a made in one piece with the valve body Ia of the unit and projecting axially therefrom, as shown in detail in the Figures.
  • both threaded coupling members 4a have a cylindrical shape, are coaxial with respect to one another and are provided on opposite sides of the valve body Ia.
  • Each coupling comprises, from the valve body in the direction of its free end, a first externally threaded cylindrical section 4b prolonged axially into a second section 4c with a conical surface profile tapering towards the free end of the coupling.
  • the axial hole formed centrally in the coupling member 4a and communicating with the gas path within the valve body is shown by 5.
  • Each coupling member 4a is advantageously obtained in one piece with the valve body Ia by means of moulding by die-casting.
  • each pipe is provided with a respective surface flare 2a, 3a with a conical profile able to be superimposed by form fitting on the conical surface of the section 4c of the corresponding coupling.
  • a respective ring nut or pipe- fastener nut 6 is provided and is keyed on the corresponding pipe and comprises an internally threaded cylindrical seat 6a whose nut may be screwed onto the corresponding threaded section 4b of the coupling 4.
  • a respective annular seat extending axially as a prolongation of each threaded seat 6a and shaped with a conical profile is shown by 7 and is of a dimension such as to match the profile of the corresponding flare facing it, thus ensuring the gas-tight locking of the pipe on the corresponding coupling. This ensures gas-tightness both on the inner side of the flare in contact with the conical surface of the coupling 4 and on the outer side of the flare in contact with the conical surface of the ring nut.
  • the leak-tight connection system of the invention provides a simplification in comparison with known systems as it may take place directly without requiring any additional members such as a nipple or like threaded coupling for the connection of the pipe to the valve unit.
  • the coupling member on the valve unit side may also be obtained in one piece with the valve body at the time of die-casting, offering an overall saving of moulding costs and, more generally, manufacturing costs of the valve unit.
  • a further advantage lies in the simplification of the operations to lock the leak-tight connection, which merely require the pipe-fastener ring nut to be screwed onto the corresponding coupling.
  • the dismantling of the connection of each pipe to the valve body is correspondingly simple and rapid.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve Housings (AREA)

Abstract

A valve unit, in particular for gas, comprises means for the leak-tight connection of this unit to respective pipes (2,3), these connection means comprising respective threaded engagement couplings (4), wherein these means comprise, for the connection of each pipe, a respective threaded male coupling member (4a) made in one piece with the valve unit and wherein each respective coupling member (4a) comprises, at its free end, a surface with a conical profile (4c) adapted to be coupled to a flared end (2a,3a) of the corresponding pipe (2,3) in order to ensure the gas-tightness of the coupling of these surfaces, leak-tight locking being provided by means of a pipe-fastener nut (6) screwed on the threaded section of the coupling member (4a).

Description

A valve unit, in particular for gas Technical field
The present invention relates to a valve unit, in particular for gas, having the characteristic features set out in the preamble of the main claim. Technological background
The invention is of particular, but not exclusive, application in the particular sector of leak-tight connection systems for valve units adapted to supply combustible gas to fires or like heating appliances.
In this field, it is known, in order to connect the valve unit to the gas pipes, to provide this unit with respective female coupling members in the form of threaded cylindrical seats in the body of the valve unit. The connection system entails, for the connection of each supply and delivery pipe, the use of a respective male coupling member, otherwise known as a nipple, provided with a first threaded section which can be screwed into the threaded seat of the valve body and a second threaded section which can be screwed into a ring nut or pipe-fastener nut. A sealing gasket is normally provided between the ring nut and the nipple, although this seal may also be obtained by flaring the free end of the pipe and locking (by means of the ring nut) this end against a conical surface provided at the end of the nipple, on the side of this pipe. This leak-tight connection system is normally provided both the gas supply and delivery pipes of the valve unit and thus requires the use of a pair of nipple members for each valve unit, in addition to the fact that the connection requires the two threaded sections of each nipple to be screwed into the corresponding nuts. Disclosure of the invention
The object of the invention is to simplify the leak-tight connection system for valve units of the type described above, reducing the number of components as well as operations to ensure the leak-tight connection of the gas pipes to the valve unit, thereby reducing costs and times, while providing an equally reliable gas-tight system.
These and other objects to be set out in detail in the following description are achieved by means of a valve unit in accordance with the accompanying claims. Brief description of the drawings
The characteristic features and advantages of the invention are set out in the following detailed description of a preferred embodiment, given by way of non-limiting example, made with reference to the accompanying drawings, in which: Fig. 1 is a perspective view, with members detached, of a leak-tight connection system provided in a valve unit in accordance with the present invention;
Fig. 2 is a partial view in axial section of the valve unit of Fig. 1, with the members of the leak-tight sealing system assembled. Preferred embodiments of the invention
In the accompanying Figures, a valve unit of the present invention is shown overall by 1 and is adapted to be connected in a leak-tight manner to corresponding gas supply and delivery pipes shown respectively by 2 and 3.
The pipes 2 and 3 are connected to the valve unit at the location of a first and a second coupling, both shown by 4, only one of which will be described in detail below as the other is structurally identical.
Similar details of both couplings will also bear the same reference numerals for ease of description.
Each coupling 4 is of the threaded engagement type and comprises a respective male coupling member 4a made in one piece with the valve body Ia of the unit and projecting axially therefrom, as shown in detail in the Figures. In further detail, both threaded coupling members 4a have a cylindrical shape, are coaxial with respect to one another and are provided on opposite sides of the valve body Ia. Each coupling comprises, from the valve body in the direction of its free end, a first externally threaded cylindrical section 4b prolonged axially into a second section 4c with a conical surface profile tapering towards the free end of the coupling. The axial hole formed centrally in the coupling member 4a and communicating with the gas path within the valve body is shown by 5.
Each coupling member 4a is advantageously obtained in one piece with the valve body Ia by means of moulding by die-casting.
For the leak-tight connection of the pipes 2, 3 to the valve unit, the free end of each pipe is provided with a respective surface flare 2a, 3a with a conical profile able to be superimposed by form fitting on the conical surface of the section 4c of the corresponding coupling. For the leak-tight locking of the conical surfaces in contact, a respective ring nut or pipe- fastener nut 6 is provided and is keyed on the corresponding pipe and comprises an internally threaded cylindrical seat 6a whose nut may be screwed onto the corresponding threaded section 4b of the coupling 4. A respective annular seat extending axially as a prolongation of each threaded seat 6a and shaped with a conical profile is shown by 7 and is of a dimension such as to match the profile of the corresponding flare facing it, thus ensuring the gas-tight locking of the pipe on the corresponding coupling. This ensures gas-tightness both on the inner side of the flare in contact with the conical surface of the coupling 4 and on the outer side of the flare in contact with the conical surface of the ring nut.
The invention achieves the objects set out above and offers a number of advantages over known solutions. It will be appreciated in particular that the leak-tight connection system of the invention provides a simplification in comparison with known systems as it may take place directly without requiring any additional members such as a nipple or like threaded coupling for the connection of the pipe to the valve unit. The coupling member on the valve unit side may also be obtained in one piece with the valve body at the time of die-casting, offering an overall saving of moulding costs and, more generally, manufacturing costs of the valve unit.
A further advantage lies in the simplification of the operations to lock the leak-tight connection, which merely require the pipe-fastener ring nut to be screwed onto the corresponding coupling. The dismantling of the connection of each pipe to the valve body is correspondingly simple and rapid.

Claims

C L A I M S
1. A valve unit, in particular for gas, comprising means for the leak- tight connection of this unit to respective pipes (2,3), these connection means comprising respective threaded engagement couplings (4), characterised in that these means comprise, for the connection of each pipe, a respective threaded male coupling member (4a) made in one piece with the valve unit and in that each respective coupling member (4a) comprises, at its free end, a surface with a conical profile (4c) adapted to be coupled to a flared end (2a, 3a) of the corresponding pipe (2,3) in order to ensure the gas-tightness of the coupling of these surfaces, leak-tight locking being provided by means of a pipe-fastener nut (6) screwed on the threaded section of the coupling member (4a).
2. A valve unit according to claim 1, wherein the coupling members (4a) are shaped as externally threaded cylindrical connections, the conical profile (4c) of each free end of the couplings (4a) extending as an axial prolongation of the corresponding threaded section (4b).
3. A valve unit according to claim 1 or 2, wherein the valve unit is provided with a pair of these male coupling members (4a), coaxial with one another, disposed on axially opposite sides of this unit and adapted to connect respective supply and delivery pipes (2,3) to the valve unit in a leak-tight manner.
4. A method of manufacture of the valve unit according to one or more of the preceding claims, wherein each male coupling member (4a) is obtained in one piece with the body of the valve unit by die-casting.
PCT/EP2006/005890 2006-03-07 2006-06-20 A valve unit, in particular for gas WO2007101456A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD20060080 ITPD20060080A1 (en) 2006-03-07 2006-03-07 VALVE GROUP, PARTICULARLY FOR GAS
ITPD2006A000080 2006-03-07

Publications (1)

Publication Number Publication Date
WO2007101456A1 true WO2007101456A1 (en) 2007-09-13

Family

ID=37603434

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/005890 WO2007101456A1 (en) 2006-03-07 2006-06-20 A valve unit, in particular for gas

Country Status (2)

Country Link
IT (1) ITPD20060080A1 (en)
WO (1) WO2007101456A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106287038A (en) * 2016-09-06 2017-01-04 东莞金兆顺五金工业有限公司 A kind of feed liquor leak-proof device
CN106443029A (en) * 2016-08-28 2017-02-22 济南海能仪器股份有限公司 Gas circuit connection device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE333766A (en) *
GB191010304A (en) * 1910-04-27 1911-04-27 James Ashby Connector for Lead Pipes and the like.
FR806345A (en) * 1936-05-12 1936-12-12 Joint fitting for pipes and branching devices
US4538835A (en) * 1981-12-07 1985-09-03 Sundholm Goeran Connection for joining a pipe having a flared end to a fixed connection piece, such as a pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE333766A (en) *
GB191010304A (en) * 1910-04-27 1911-04-27 James Ashby Connector for Lead Pipes and the like.
FR806345A (en) * 1936-05-12 1936-12-12 Joint fitting for pipes and branching devices
US4538835A (en) * 1981-12-07 1985-09-03 Sundholm Goeran Connection for joining a pipe having a flared end to a fixed connection piece, such as a pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106443029A (en) * 2016-08-28 2017-02-22 济南海能仪器股份有限公司 Gas circuit connection device
CN106443029B (en) * 2016-08-28 2018-06-19 济南海能仪器股份有限公司 gas circuit connecting device
CN106287038A (en) * 2016-09-06 2017-01-04 东莞金兆顺五金工业有限公司 A kind of feed liquor leak-proof device

Also Published As

Publication number Publication date
ITPD20060080A1 (en) 2007-09-08

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