EP1777455A1 - Flammenrückschlagsicherungseinrichtung zum Einbau ohne Werkzeug - Google Patents

Flammenrückschlagsicherungseinrichtung zum Einbau ohne Werkzeug Download PDF

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Publication number
EP1777455A1
EP1777455A1 EP05300838A EP05300838A EP1777455A1 EP 1777455 A1 EP1777455 A1 EP 1777455A1 EP 05300838 A EP05300838 A EP 05300838A EP 05300838 A EP05300838 A EP 05300838A EP 1777455 A1 EP1777455 A1 EP 1777455A1
Authority
EP
European Patent Office
Prior art keywords
nut
ring
gas
orifice
passage
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.)
Withdrawn
Application number
EP05300838A
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English (en)
French (fr)
Inventor
Marco Arzenton
Alessandro Moretti
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.)
FRO SpA
Original Assignee
FRO SpA
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 FRO SpA filed Critical FRO SpA
Priority to EP05300838A priority Critical patent/EP1777455A1/de
Publication of EP1777455A1 publication Critical patent/EP1777455A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/82—Preventing flashback or blowback
    • F23D14/825—Preventing flashback or blowback using valves

Definitions

  • the present invention relates to a safety device of the flame arresting type (ARPF) with manual screwing, that is to say without requiring the use of a suitable tool, in particular intended to equip pipelines with gases, such as fuel gas and / or combustion gas ducts connecting a gas expander or an expansion valve integrated to a welding torch, cutting or the like, and its manufacturing process.
  • gases such as fuel gas and / or combustion gas ducts connecting a gas expander or an expansion valve integrated to a welding torch, cutting or the like, and its manufacturing process.
  • ARPF type safety devices for combustible and oxidizing gases, such as oxygen are described in particular in the EN 730-1 or ISO 5175 standard.
  • ARPF-type safety devices protect the gas circuits against the flow of gas in the opposite direction to that desired, commonly known as the slow return of gas, and against the propagation or rise of a flame or backfire , especially in the pipes and / or in the regulator or an integrated pressure regulating valve located upstream of the ARPF type device.
  • the slow gas return is usually prevented by a valve that opens under the effect of the pressure when it is exercised correctly upstream of the device, that is to say when the gas flows in the desired direction, and, conversely, closes if the downstream gas pressure is greater than the upstream gas pressure.
  • the flameback is conventionally prevented by a porous filter, generally obtained by sintering of stainless steel grains, which offers the gas that passes through it only holes of section smaller than that which can pass through a flame without 'switch off.
  • ARPF type devices are very efficient and widely used industrially, especially in the field of welding, cutting or the like where they are conventionally mounted upstream torches, that is to say on the side of the arrival of the pipes gas supplying the torches fuel gas and oxidizer or, at the opposite end, that is to say at the outlet of the expansion valve or integrated pressure valve which is connected to one or more gas pipes.
  • an ARPF type safety device on a pressure reducer or pressure reducer, for example, is by screwing a threaded end portion of the device onto the threaded outlet of the pressure reducer or pressure reducer, the another end of the ARPF device being connected to the gas pipe for supplying the torch fuel gas or oxidant, such as oxygen.
  • EP-A-1512910 proposes an ARPF type device with a non-dissociable nut-ring, comprising an upstream portion constricted in the direction of the body by mechanical deformation, and retained by cooperation of the tightened upstream portion with at least a portion of the body of the ARPF.
  • the ring nut itself can be degraded when the ARPF is subject to frequent assembly and disassembly, since the clamping tool will, each time, cause a more or less significant degradation of the surface of the nut on which it will come to support and where the couple will be applied.
  • the problem that arises then is to propose an improved ARPF type device that can be easily connected to a device to be secured, in particular to a regulator or valve-regulator connected in particular, via one or more gas conduits, to a welding torch, cutting or the like, which does not require the use of a clamping tool, and which is low cost to manufacture industrially.
  • the invention also relates to a gas pipe, expansion valve or gas expansion valve comprising an ARPF device according to the invention, as well as the use of such an ARPF device to protect a gas pipe, an expansion valve or a tap.
  • gas expansion valve in particular an expansion valve or a pressure reducing valve connected to a welding, cutting or similar manual welding torch.
  • FIGS. 1 (side view) and 2 (longitudinal sectional view) show an embodiment of an ARPF flame arrestor type safety device according to the invention, in particular for a regulator or pressure reducing valve of FIG. welding gas.
  • the ARPF type safety device comprises a main body 1, of elongated shape and of axis AA, traversed by an internal gas passage 2 connecting a first orifice 4 to a second orifice 5 through which the gas flows.
  • the gas therefore normally flows in the device in the direction from the orifice 4 to the orifice 5 (direction of the arrow F).
  • Conventional safety means capable of performing the functions of gas anti-return and flame arrestor, are arranged on the gas passage 2, inside the body 1.
  • These means comprise, in a manner known per se, a flame-arresting filter 10 and a valve means 12 acting as an anti-return gas, as well as other elements, such as return spring 11, valve seat 13 ...
  • the device also comprises a ring-nut 6 which can not be separated from said body and is free to rotate about the axis AA thereof.
  • the nut-ring 6 is positioned so as to form a sleeve that is free to rotate around the connection piece 7.
  • This ring-nut 6 is used to connect the ARPF device on the fitting of a pressure reducer or expansion valve for example or on any other device to be protected by such a device.
  • the ring-nut 6 has a downstream portion 8 internally threaded adapted to cooperate by screwing with a complementary threaded portion of the expander, expansion valve or the like.
  • the inner wall of the nut ring 6 has a shoulder 15 projecting radially towards the connection piece 7, that is to say say towards the axis AA, and cooperating with a stop 14 arranged within the connecting piece 7 so as to retain the ring-nut 6 in position around the connecting piece 7 and to prevent its disengagement of with the body 1, while allowing a free rotation of the ring-nut 6 about the axis AA of the body 1.
  • the abutment 14 may be constituted for example by a projecting portion of this wall of the endpiece 7.
  • the shoulder 15 may be made, as appropriate, for example by cutting a part of the wall of the ring-nut 6 or by cold mechanical deformation as taught by EP-A-1512910 .
  • the nut-ring 6 is made of a deformable metal or metal alloy, for example brass, copper, steel or aluminum.
  • said nut-ring 6 comprises, on all or part of its outer peripheral surface, an area 16 shaped and / or machined so as to obtain a roughness, a structure and / or shape giving it good grip and good maneuverability by the operator by allowing easy manual rotation by application of sufficient torque to a good hold by application of a minimum force, even when the operator is wearing gloves.
  • connection end piece 7 of the ARPF which is of oblong shape, is traversed axially by an internal gas passage 2 having a first orifice 4 at its connection end on the the device to which the ARPF must be connected.
  • the ARPF includes a second orifice 5 from which is likely to come the flashback.
  • the ARPF of the present invention comprises, on its connecting piece 7, a peripheral housing 3, such as an annular groove, in which a sealing means is arranged. 9 fluidic, such as an O-ring.
  • this housing 3 with sealing means 9 it is possible to make an ARPF only manually screwing, that is to say without tools, the thread or tapping 8 located on the inner wall of the ring- nut 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
EP05300838A 2005-10-19 2005-10-19 Flammenrückschlagsicherungseinrichtung zum Einbau ohne Werkzeug Withdrawn EP1777455A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05300838A EP1777455A1 (de) 2005-10-19 2005-10-19 Flammenrückschlagsicherungseinrichtung zum Einbau ohne Werkzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05300838A EP1777455A1 (de) 2005-10-19 2005-10-19 Flammenrückschlagsicherungseinrichtung zum Einbau ohne Werkzeug

Publications (1)

Publication Number Publication Date
EP1777455A1 true EP1777455A1 (de) 2007-04-25

Family

ID=35840647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05300838A Withdrawn EP1777455A1 (de) 2005-10-19 2005-10-19 Flammenrückschlagsicherungseinrichtung zum Einbau ohne Werkzeug

Country Status (1)

Country Link
EP (1) EP1777455A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661965A (en) * 1948-10-07 1953-12-08 Chiksan Co Union which permits misalignment
FR1086073A (fr) * 1953-07-03 1955-02-09 Air Liquide Perfectionnements aux raccords étanches aux gaz sous hautes pressions pour tubulures
GB2181530A (en) * 1985-09-10 1987-04-23 Butcher Brothers Limited Flashback arrestor
US5197769A (en) * 1988-01-27 1993-03-30 Nwd International, Inc. Adjustable O-ring port fitting for a hydraulic coupling
EP1033516A1 (de) * 1999-03-01 2000-09-06 Alessandro Piana Ventil zum Regeln von Medien
EP1512910A1 (de) 2003-09-03 2005-03-09 FRO Srl Flammenrückschlagvorrichtung mit einer kaltverformten Drehkupplung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661965A (en) * 1948-10-07 1953-12-08 Chiksan Co Union which permits misalignment
FR1086073A (fr) * 1953-07-03 1955-02-09 Air Liquide Perfectionnements aux raccords étanches aux gaz sous hautes pressions pour tubulures
GB2181530A (en) * 1985-09-10 1987-04-23 Butcher Brothers Limited Flashback arrestor
US5197769A (en) * 1988-01-27 1993-03-30 Nwd International, Inc. Adjustable O-ring port fitting for a hydraulic coupling
EP1033516A1 (de) * 1999-03-01 2000-09-06 Alessandro Piana Ventil zum Regeln von Medien
EP1512910A1 (de) 2003-09-03 2005-03-09 FRO Srl Flammenrückschlagvorrichtung mit einer kaltverformten Drehkupplung

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