WO1994027072A1 - Dispositifs de securite - Google Patents

Dispositifs de securite Download PDF

Info

Publication number
WO1994027072A1
WO1994027072A1 PCT/GB1994/001027 GB9401027W WO9427072A1 WO 1994027072 A1 WO1994027072 A1 WO 1994027072A1 GB 9401027 W GB9401027 W GB 9401027W WO 9427072 A1 WO9427072 A1 WO 9427072A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
closure member
safety device
flow path
fluid control
Prior art date
Application number
PCT/GB1994/001027
Other languages
English (en)
Inventor
Gordon W. Mclean
Original Assignee
Richard Threlfall Group Limited
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 Richard Threlfall Group Limited filed Critical Richard Threlfall Group Limited
Priority to AU66544/94A priority Critical patent/AU6654494A/en
Publication of WO1994027072A1 publication Critical patent/WO1994027072A1/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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
    • 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
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • 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
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
    • F16K17/383—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug

Definitions

  • the invention relates to safety devices and particularly, but not exclusively, to safety devices for use in conjunction with fluid control valves or flow lines.
  • valve which is fail safe in the event of a fire.
  • the valve comprises a rotatable ball arrangement having a cylindrical passageway formed therein.
  • the valve has a first, open configuration with the passageway in line with a fluid flow path, and a second configuration in which the valve is closed.
  • a meltable valve seating arrangement to one side of the ball, and a spring, bearing against the opposing side of the ball co-operate to bring about a degree of re-sealing.
  • a disadvantage which has been discovered with the above type of valve is that in some circumstances following a fire, the ball may stick in the open position, or residual particles of the seating arrangement may hinder re- sealing. In such circumstances, the valve is susceptible to leakage.
  • a safety device comprising:
  • a body defining a flow path a closure member situated within the flow path; biasing means bearing against the closure member; and fusible or corrodible linking means wherein, in an emergency situation, the linking means melts or corrodes, causing the closure member to change an operating status of the device.
  • the safety device performs an automatic shut-off function and, in ti e emergency situation, the operating status changes from an open configuration, in which fluid is allowed to flow along the flow path, to a closed configuration in which the flow path is obstructed.
  • the valve body comprises an internal passageway, forming the flow path, and a fixed member situated within the passageway, the fixed member having a solid portion and one or more apertures, to permit fluid flow through the one or more apertures when in the open configuration, the closure member being of a complimentary construction to that of the fixed member, such that in the closed configuration, the fixed member and the closure member co-operate to obstruct the flow path.
  • both the fixed member and the closure member are positioned transversely with respect to the fluid flow path.
  • a circlip. or similar fixing means may be provided for retaining the biasing means in position within the body.
  • the fixed member and the closure member are held apart by the linking means and. in the closed configuration, are urged towards each other by the biasing means. - .1 -
  • the closure member is a plate-like member having one or more apertures formed therein.
  • the closure member may comprise a circular washer and the fixed member may comprise a solid central portion suspended within the passageway and joined to the rest of the valve body by at least two bridging portions.
  • the closure member may be a closure valve.
  • the closure valve preferably comprises a connecting rod and a head.
  • the biasing means encircle the connecting rod and bear against the head such that, upon the occurrence of an emergency, the head is brought into contact with the fixed member so as to obstruct the flow path.
  • Guide means may be provided for guiding movement of the closure member when changing from the open configuration to the closed configuration.
  • the biasing means may encircle the connecting rods, bear against the fixed member and be arranged to act against the guide means so as to move the valve and change the operating status of the device in an emergency.
  • the biasing means may comprise a compression spring or one or more disc springs.
  • the guide means may be a part of the closure valve.
  • the safety device may form part oi ' a fluid flow line.
  • the safety device may form a part of a fluid control valve.
  • the fluid control valve additionally comprises a valve seat and a valve member abutting the valve seat, the biasing means bearing against the valve member and the valve member being movable from a closed position, to an open position, in which fluid flow can take place along the flow path through a passage in the valve member.
  • valve seat and the biasing means are situated on opposing sides of the valve member, the action of the biasing means tending to form an effective sealing arrangement between the valve member and the seat.
  • the safety device may be an automatic opening device such that, in the emergency situation, the operating status changes from a closed configuration, in which the flow path is obstructed, to an open configuration in which fluid is allowed to flow along the flow path.
  • the closed configuration the fixed member and the closure member may be held together by the linking means and. in the open configuration, are urged apart from each other by the biasing means.
  • a fluid control valve comprising:
  • valve body de lining a flow path: a valve member movable from a closed position to an open position in which fluid flow can take place along the flow path: and a safety device comprising a closure member and fusible or corrodible linking means adapted to melt or corrode upon the occurrence of an emergency to cause or allow the closure member to move, to cut off fluid flow through the valve.
  • valve seat within the flow path, the valve member abutting the valve seat.
  • Fluid flow may take place through a passage in the valve member.
  • the safety device may be housed within the valve body, there being biasing means bearing against the closure member to move the closure member when melting or corrosion takes place.
  • the valve seat comprises a first, rigid, seat portion and a second, resilient, seat portion, the valve member normally engaging the resilient portion.
  • the rigid seat portion is of metal and the resilient seat portion is of a plastics material.
  • the resilient seat portion is made of PTFE.
  • the biasing means exerts a degree of compression sufficient to cut off fluid flow through the valve in an emergency, regardless of which side of the valve is the high pressure side.
  • the biasing means may either abut directly against the valve member, or via a bearing member.
  • the bearing member mav be made of PTFE.
  • the biasing means may comprise a compression spring or one or more disc springs.
  • the valve member may comprise a ball member.
  • Figure 1 is a side view in cross section of an embodiment of a valve incorporating a safety device
  • Figure 2 is a more detailed side view, in section, of part of the safety device of Figure 1 ;
  • Figure 3 is an end view of the valve part of Figure 2.
  • Figure 4 is a side view in section of a second embodiment of safety device.
  • Figures 5 to 7 are respectively side sectional views of third to fifth embodiments of safety devices.
  • valve shown in Figures 1 to 3 is intended for use as a gas meter control cock, and must therefore be capable of operating at low pressures, for example of less than 1 bar.
  • the valve comprises a brass body 1 defining a through passageway having an inlet end 2 and an outlet nd 3. Within the passageway, there is a valve seat indicated generally at 4. This seat comprises a rigid shoulder 5 defined by the brass body 1 and a ring 6 of PTFE.
  • a valve member in the form of a ball 7 having a passage 8 therethrough.
  • the ball 7 is urged against the o-ring 6 by a compression spring 9.
  • the compression spring 9 acts between a bearing member 10 of brass, and a closure member 1 1 .
  • the closure member 1 1 is held in position in the passageway by fusible linking means 12.
  • the fusible linking means 12 abuts the closure member 1 1 and also engages a fixed portion 19. which forms part of the valve body 1 .
  • the fixed portion 19 is shown in more detail in Figures 2 and 3, it comprises a central region 20. suspended in the passageway by two bridging portions 21 .
  • the central portion has a diameter " A " which is less than the internal diameter of the passageway and allows fluid to flow around it by means of apertures 22.
  • Closure member I I is a washer having a central hole whose diameter is less than the central diameter "A" o ⁇ ' the fixed portion 19.
  • the ball 7 can however be turned through 90" so that the passage extends at right angles to the valve passageway, and close the valve, by means of a rectangular cross-section spigot 13 which engages in an appropriately shaped socket in the top of the ball 7.
  • the spigot 13 forms the lower part of a valve spindle 14.
  • the valve spindle 14 is rotatable in an upwardly extending bore 15 of the valve body.
  • the spindle is retained in position by a circlip l b and the bore 15 also contains an o-ring 17.
  • a square section operating head 18 is integral with the spindle 14.
  • the gas flows from right to left as viewed in the figure, and so the gas pressure is applied to the right hand side of the ball 7.
  • the embodiment shown comprises a valve which seals efficiently even under very iow pressures.
  • the valve can be used under vacuum conditions.
  • the valve will of course operate very effectively at high pressures also.
  • the valve can be used as a bi-directional valve. Provided that the strength of the spring 9 is selected accordingly, the spring is capable of providing effective sealing, even if a relatively high pressure is applied to the left hand side of the valve.
  • the spring 9 has a dual function. In addition to forming the seal by urging the ball 7 against the o-ring 6. it also forms part of a safety device comprising additionally the closure member 1 1 , the fusible linking means 12 and the fixed portion 20.
  • the fusible linking means 12 is arranged to melt. Melting of the means 12 allows the closure member 1 1 to move, under the action of the spring 9 towards the fixed portion 20. where the closure member overlays the portion 20 and, since the internal diameter of the aperture of the closure member is less than that of the solid central portion 20 of the plug, fluid flow is cut-off.
  • the strength of the spring 9 is selected to be sufficient to cut-off the flow and maintain the valve in the cut-off state in an emergency condition, for any of a range of anticipated fluid pressures.
  • connection between the spigot 13 and the ball 7 is such as to permit a degree of movement of the ball 7 longitudinally of the through passageway under the influence of the spring 9 and that, to this extent, the ball 7 can be regarded as free floating.
  • valve spindle design may be altered, the compression spring 9 might for example be replaced by - l ⁇ - disc springs, and the spring means may act directly on the ball 7 without the interposition of a bearing member as such.
  • the circlips could be replaced by threaded retainers.
  • the manufacturing tolerances needed to achieve the required range of assembly conditions need not be stringent, since any excess play is taken up by the spring. Since the sealing force is largely dependent upon the spring, and is therefore reasonably consistent, the effort required to open and close the valve will also be reasonably consistent. The turning effort can therefore be reasonably accurately predicted and the valve can be designed so that the turning effort is reasonably low.
  • a further advantage is that any wear which takes place between the valve seat and the ball is automatically compensated for by the spring.
  • the safety device may be provided independently of such a valve and disposed within a flow line.
  • FIGS. 4 to 7 show alternative embodiments of safety devices for use within a flow line. Features similar to those described in relation to figures 1 to 3 are designated bv like numerals.
  • a flow line 23 incorporating a safety device.
  • the safety device comprises linking means 12. closure member 24.
  • spring 9. a spring retaining circlip 25 and a fixed portion 26 defining an aperture 27.
  • the portion 26 forms an integral part of the flow line 23.
  • the linking means 12 is arranged to melt.
  • the spring 9 is then able to urge the closure member 24 into overlying engagement with the fixed portion 26 to thereby block fluid flow through aperture 27.
  • the circlip 25 acts as a scat for the spring 9 to locate it within the flow line 23.
  • the device incorporates a closure member in the form of a closure valve which comprises a head 28. a connecting rod 29 and a valve guide 30.
  • the closure valve is situated within the flow line 23 (which may be identical to the flow line 23 of figure 4) with the head 28 on one side of aperture 27 and the guide 30 on the other.
  • the connecting rod 29. linking head 28 to guide 30. is encircled by spring 9.
  • Fusible linking means 12 is provided between valve guide 30 and a retaining circlip 25.
  • valve guide 30 is then free to move, under action of spring 9. into abutment against the portion 26, closing off the aperture 27.
  • Figure 6 shows a further safety device again incorporating a type of closure valve having a head 28 and connecting rod 29.
  • a fixed guide and support 3 1 is provided within the flow line parallel to, and spaced apart from the portion 26.
  • the spring 9 encircles the connecting rod and bears against the fixed guide and support 1 and the head 28.
  • fusible link means 12 and fixing nut 32 hold the closure ⁇ alve in position.
  • the fusible link means 12 melts and the head 28 - under action of the spring 9 and guided by guide and support 31 - is brought in.o abutment with the portion 26. closing off the aperture 27.
  • Figure 7 shows a yet further embodiment of safety device.
  • the closure member has both a head 33 and a base 34, one on either side of aperture 27 and linked by connecting rod 29. Both head and base extend across the full width of the flow line and act as guides.
  • Spring 9 encircles the connecting rod 29 and bears against the base 34 and portion 26.
  • Link means 12 hold the head 33 away from the aperture 27.
  • link 12 melts and the device changes to the closed configuration.
  • the closure member may be pushed or pulled into engagement by biasing means other than springs, such as by pressurised cylinder, gravity or internal line pressure.
  • biasing means other than springs, such as by pressurised cylinder, gravity or internal line pressure.
  • the safety device may be used in combination with types of valves other than ball valves, for instance butterfly, globe, gate or plug valves or in combination with any other pipeline component.
  • the fusible linking means may be adapted to be easily corrodible such that ingress of chemicals or similar, into a flow line will cause dissolution of the ⁇ nj ing means and cut-off the fluid flow.
  • the linking means may be adapted to disintegrate or fracture when subjected to shock or excessive pressure.
  • the safety device could, by rearrangement of the various apertures and components, also be used to initiate a fluid flow instead of cutting it off. For instance, excessive heat could cause a linking means in a sprinkler system to melt and initiate a sprinkling operation.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Abstract

L'invention concerne un dispositif de sécurité constitué par un corps (1) définissant un trajet d'écoulement (2, 3), un élément de fermeture (7) situé à l'intérieur dudit trajet, des moyens de sollicitation (9) s'appuyant contre l'élément de fermeture et des moyens de liaison fusibles ou corrodables (12). En situation d'urgence, les moyens de liaison fondent ou se corrodent, de ce fait, l'élément de fermeture modifie le mode de fonctionnement du dispositif. On peut utiliser ledit dispositif en tant que vanne de régulation de débit se fermant automatiquement en cas d'urgence.
PCT/GB1994/001027 1993-05-12 1994-05-12 Dispositifs de securite WO1994027072A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU66544/94A AU6654494A (en) 1993-05-12 1994-05-12 Safety devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9309755.8 1993-05-12
GB939309755A GB9309755D0 (en) 1993-05-12 1993-05-12 Safety devices

Publications (1)

Publication Number Publication Date
WO1994027072A1 true WO1994027072A1 (fr) 1994-11-24

Family

ID=10735323

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001027 WO1994027072A1 (fr) 1993-05-12 1994-05-12 Dispositifs de securite

Country Status (3)

Country Link
AU (1) AU6654494A (fr)
GB (1) GB9309755D0 (fr)
WO (1) WO1994027072A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU669626B2 (en) * 1994-06-15 1996-06-13 Focus Lifestyle Products Pty. Ltd. Safety device for a valve
GB2378746A (en) * 2001-06-09 2003-02-19 George Brookes A temperature activated isolation valve
US20160265671A1 (en) * 2015-03-09 2016-09-15 Azbil Corporation Ball valve
US10695598B2 (en) 2017-08-28 2020-06-30 Justrite Manufacturing Company, Llc Vented safety cabinet with thermally-actuated damper

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR685154A (fr) * 1929-11-19 1930-07-05 Perfectionnements apportés aux moyens utilisés pour interrompre automatiquement les conduites
US2707965A (en) * 1952-02-20 1955-05-10 Armstrong Siddeley Motors Ltd Flow check valve
US3955589A (en) * 1974-06-03 1976-05-11 Rodney Thomas Beazley Fluid isolating valve
FR2323082A1 (fr) * 1975-09-03 1977-04-01 Strulik Wilhelm Bouche de ventilation pare-flamme et eventuellement coupe-feu
US4488566A (en) * 1983-06-22 1984-12-18 The Singer Company Thermally responsive slam shut valve assembly
US4887631A (en) * 1989-01-26 1989-12-19 Itt Corporation Fire isolation device
EP0364906A2 (fr) * 1988-10-21 1990-04-25 P+S ARMATUREN GmbH Vanne de sécurité thermique
GB2231640A (en) * 1989-04-07 1990-11-21 Richard Threlfall Limited Valves

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR685154A (fr) * 1929-11-19 1930-07-05 Perfectionnements apportés aux moyens utilisés pour interrompre automatiquement les conduites
US2707965A (en) * 1952-02-20 1955-05-10 Armstrong Siddeley Motors Ltd Flow check valve
US3955589A (en) * 1974-06-03 1976-05-11 Rodney Thomas Beazley Fluid isolating valve
FR2323082A1 (fr) * 1975-09-03 1977-04-01 Strulik Wilhelm Bouche de ventilation pare-flamme et eventuellement coupe-feu
US4488566A (en) * 1983-06-22 1984-12-18 The Singer Company Thermally responsive slam shut valve assembly
EP0364906A2 (fr) * 1988-10-21 1990-04-25 P+S ARMATUREN GmbH Vanne de sécurité thermique
US4887631A (en) * 1989-01-26 1989-12-19 Itt Corporation Fire isolation device
GB2231640A (en) * 1989-04-07 1990-11-21 Richard Threlfall Limited Valves

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU669626B2 (en) * 1994-06-15 1996-06-13 Focus Lifestyle Products Pty. Ltd. Safety device for a valve
GB2378746A (en) * 2001-06-09 2003-02-19 George Brookes A temperature activated isolation valve
GB2378746B (en) * 2001-06-09 2004-09-01 George Brookes Isolation valve
US20160265671A1 (en) * 2015-03-09 2016-09-15 Azbil Corporation Ball valve
US10695598B2 (en) 2017-08-28 2020-06-30 Justrite Manufacturing Company, Llc Vented safety cabinet with thermally-actuated damper
US11957942B2 (en) 2017-08-28 2024-04-16 Justrite Manufacturing Company, L.L.C. Vented safety cabinet with thermally-actuated damper

Also Published As

Publication number Publication date
GB9309755D0 (en) 1993-06-23
AU6654494A (en) 1994-12-12

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