WO1994002768A1 - Soupape de coupure automatique pour le gaz - Google Patents

Soupape de coupure automatique pour le gaz Download PDF

Info

Publication number
WO1994002768A1
WO1994002768A1 PCT/US1993/007025 US9307025W WO9402768A1 WO 1994002768 A1 WO1994002768 A1 WO 1994002768A1 US 9307025 W US9307025 W US 9307025W WO 9402768 A1 WO9402768 A1 WO 9402768A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
stem
pressure
arm
housing
Prior art date
Application number
PCT/US1993/007025
Other languages
English (en)
Inventor
Ruben Masel
George Valdshtein
Original Assignee
Barish, Benjamin, J.
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 Barish, Benjamin, J. filed Critical Barish, Benjamin, J.
Publication of WO1994002768A1 publication Critical patent/WO1994002768A1/fr

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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/042—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with locking or disconnecting arrangements

Definitions

  • the present invention relates to an automatic gas cut-off valve which automatically cuts-off the supply of gas for safety purposes when certain conditions are sensed.
  • One of the drawbacks in using gas for heating or cooking purposes is the danger of explosion or suffocation that may result by leakage of gas or by turning on the gas supply when the flame has been extinguished.
  • leakage of gas from the supply line before it reaches the burner may produce an accumulation of gas within a confined space, resulting in the danger of an explosion if the gas is ignited.
  • the flame may become extinguished by a drop, interruption, or increase, in the gas supply pressure, followed by the resumption of the supply of gas while the flame is extinguished, thereby also creating the danger of explosion or suffocation.
  • a drop in gas supply pressure may be caused by a sudden overloading of the gas supply system when many gas appliances are operated simultaneously, or by the gas container become exhausted or subjected to a low temperature, or by damage to the gas supply line.
  • An increase in the inlet pressure may be caused by malfunctioning of the gas pressure regulator.
  • an automatic gas cut-off valve comprising: a housing including an inlet, an outlet, and a passageway having a valve opening connecting the inlet to the outlet; a valve member movable within the housing and normally biased to a closed position with respect to the valve opening; and a control assembly within the housing for retaining the valve member in an open position with respect to the valve opening; the control assembly including: a pressure sensor sensing the pressure within a control chamber in the housing between the valve opening and the outlet, and displaceable in response to the sensed pressure; a control member; and a coupling between the control member and the pressure sensor such that when the sensor senses a predetermined pressure in the control chamber, the sensor moves the control member into engagement with the valve member and retains the valve member in its open position with respect to the valve opening, but when the sensor senses a pressure in the control chamber which is either excessively high or excessively low with respect to the predetermined pressure, the sensor moves the control member out of engagement with the valve member thereby permitting the valve member to
  • Figs. 1 and 2 are plan and side elevational views, respectively, illustrating one form of automatic gas cut-off valve constructed in accordance with the present invention
  • Fig. 3 is a longitudinal aectional view illustrating the valve of Fig. 1 in the normal operating condition of the valve;
  • Fig. 4 is a view similar to that of Fig. 3 but illustrating the shut-off condition of the valve as a result of an excessively low inlet or outlet pressure
  • Fig. 5 illustrates the condition of the valve just before shut-off as a result of an excessively high inlet pressure.
  • the valve illustrated in the drawings is particularly useful as an automatic safety valve for a gas supply installation. It includes a housing 2 having an inlet 4 for connection to a gas supply system, and an outlet 6 for connection to a gas utilization device, such as a burner used for heating or cooking purposes. Housing 2 further includes a passageway having a valve opening 8 connecting the inlet 4 to the outlet 6, which valve opening is controlled by a valve member 10.
  • Valve member 10 is in the form of a plunger normally biased by a spring 12 to a valve-closed condition wherein a pin 10a at the tip of the plunger moves within valve opening 8, and the conical portion 10b of the valve member engages a sealing ring 14 to close the valve.
  • Valve member 10 is moved to its open position, and is retained in such open position, by a lever 20 engageable with pin 10a of the valve member, to displace the valve member against the force of spring 12 away from the sealing ring 14.
  • Housing 2 is made of two separate sections 2a, 2b.
  • Housing section 2a includes the inlet 4, the valve member 10 and the valve opening 8; whereas housing section 2b includes the outlet 6 and the control assembly including lever 20 which controls valve member 10.
  • valve member 10 is biased by spring 12 to the valve closed condition against sealing ring 14, and is retained in a valve-open condition by lever 20 of the control assembly.
  • lever 20 which controls valve member 10.
  • Housing section 2b which encloses the control assembly includes an outer cover 2c and an inner cover 2d.
  • the control assembly within housing section 2b includes, in addition to lever 20, a pressure sensor in the form of a diaphragm 22 for sensing the pressure within a control chamber 24 between the valve opening 8 and the gas outlet 6.
  • the outer peripheral portion of diaphragm 22 is clamped between housing section 2b and its inner cover 2d, whereas the inner portion of the diaphragm is secured between a pair of stiff discs 26, 28 formed with a central opening 29.
  • a stem assembly, generally designated 30, is coupled to diaphragm 22 so as to be displaceable with it.
  • Stem assembly 30 is constituted of an inner part 31 which passes through opening 29 in the diaphragm discs 26, 28, an intermediate part 32 which is coupled to the outer end of part 31 , and an outer part 33 which projects through an opening 34 formed in the outer housing cover 2c.
  • a first spring 35 is interposed between the inner cover 2d and the central portion of diaphragm 22; a second spring 36 is interposed between the central portion of diaphragm 22 and the inner end of the intermediate stem part 32; and a third spring 37 is interposed between the inner cover 2d and the inner end of the intermediate stem part 32.
  • the outer stem part 33 is removably attached to the intermediate stem part 32, to enable part 33 to serve as a removable key in order to prevent manual resetting of the valve, as will be described more particularly below.
  • the outer portion of the intermediate stem part 32 is formed with a slot 32a to receive an inwardly- extending rib 33a formed on the inner end of the outer stem part 33.
  • Slot 32a is sufficiently large to provide a loss- motion connection between stem parts 32 and 33, for a reason to be described more particularly below.
  • Th outer stem part 33 is further formed with an annular rib 33b engageable with the inner face of the outer cover 2c to limit the outer position of stem part 33, and thereby of the overall stem assembly 30.
  • the outer face of the outer stem part 33 is formed with an annular strip 33c, of a contrasting colour (e.g., green) located on stem part 33 so as to be externally visible, and thereby to provide an indication to the user, when the valve is in its open condition.
  • a contrasting colour e.g., green
  • Control lever 20 is a bellcrank lever. It includes a pair of arms 20a, 20b at approximately a 90° angle to each other, and a pivotal mounting 20c at the juncture between the two arms.
  • One arm 20a is engageable with the guiding pin 10a of valve member 10, and the other arm 20b is actuated by the lower section 40 of part 31 of the stem assembly 30 disposed within the control chamber 24.
  • actuator section 40 of the stem assembly includes an upper shoulder 41 engageable with the upper surface of arm 20b of bellcrank lever 20, and a lower shoulder 42 engageable with the under surface of arm 20b.
  • Actuator section 40 further includes an annular rib 43 lined on its upper face with an 0-ring 44 engageable with the undersurface of disc 28 fixed to the central portion of diaphragm 22.
  • the inner cover 2d is further formed with an opening 38 for venting its interior to the atmosphere.
  • the illustrated valve operates as follows:
  • Valve member 10 is normally biased by spring 12 to its closed position with respect to valve opening 8. This is the normal shut-off condition of the valve, as illustrated in Fig. 4.
  • bellcrank lever 20 In order to open the valve and to maintain it open, bellcrank lever 20 must be pivotted about its pivot 20c to cause its arm 20a to engage pin 10a of valve member 10 and to move the valve member (leftwardly in Figs. 3-5), and to maintain the valve member in this moved position.
  • Diaphragm 22 senses the pressure within control chamber 24 and, as a result, the diaphragm may assume any one of three positions: (a) a normal operative position (Fig. 3) which it assumes when the pressure within control chamber 24 is at the required predetermined operative pressure; (b) a low position (Fig. 4), when the pressure within chamber 24 drops execessively below the predetermined pressure; and (c) a high position (Fig. 5), which it assumes when the pressure within control chamber 24 becomes excessively high.
  • a normal operative position Fig. 3
  • a low position Fig. 4
  • a high position Fig. 5

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

Soupape de coupure automatique pour le gaz comprenant une soupape (10) qui est mobile dans un boîtier (2) et normalement sollicitée en position fermée, et un ensemble de commande qui retient la soupape (10) en position ouverte. L'ensemble de commande est formé d'un élément (20) de commande et d'un capteur (22) de pression de sorte que lorsque le capteur (22) détecte dans une chambre (24) de commande une pression qui est soit excessivement élevée soit excessivement faible, ledit capteur (22) fait sortir l'élément (20) de commande de la soupape (10) et permet ainsi à la soupape (10) de se positionner normalement en position fermée.
PCT/US1993/007025 1992-07-24 1993-07-23 Soupape de coupure automatique pour le gaz WO1994002768A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL102628A IL102628A0 (en) 1992-07-24 1992-07-24 Automatic gas cut-off valve
IL102628 1992-07-24

Publications (1)

Publication Number Publication Date
WO1994002768A1 true WO1994002768A1 (fr) 1994-02-03

Family

ID=11063856

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/007025 WO1994002768A1 (fr) 1992-07-24 1993-07-23 Soupape de coupure automatique pour le gaz

Country Status (2)

Country Link
IL (1) IL102628A0 (fr)
WO (1) WO1994002768A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0846901A2 (fr) * 1996-12-05 1998-06-10 Messer Griesheim Gmbh Dispositif de fermeture pour une installation de remplissage d'un conteneur sous pression
EP2816436A1 (fr) * 2013-06-19 2014-12-24 Clesse Industries Détendeur de gaz à sécurité de surpression intégrée

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620820A (en) * 1949-06-29 1952-12-09 Paul L Born High and low pressure shut off valve with manual reset
US3429321A (en) * 1968-01-02 1969-02-25 American Meter Co Safety valve actuator
US4503883A (en) * 1984-06-15 1985-03-12 The Singer Company Gas pressure regulator with under and over shut-off

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620820A (en) * 1949-06-29 1952-12-09 Paul L Born High and low pressure shut off valve with manual reset
US3429321A (en) * 1968-01-02 1969-02-25 American Meter Co Safety valve actuator
US4503883A (en) * 1984-06-15 1985-03-12 The Singer Company Gas pressure regulator with under and over shut-off

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0846901A2 (fr) * 1996-12-05 1998-06-10 Messer Griesheim Gmbh Dispositif de fermeture pour une installation de remplissage d'un conteneur sous pression
EP0846901A3 (fr) * 1996-12-05 1999-04-21 Messer Griesheim Gmbh Dispositif de fermeture pour une installation de remplissage d'un conteneur sous pression
EP2816436A1 (fr) * 2013-06-19 2014-12-24 Clesse Industries Détendeur de gaz à sécurité de surpression intégrée

Also Published As

Publication number Publication date
IL102628A0 (en) 1993-01-14

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