WO2010136908A1 - Dispositif de sécurité pour soupapes et/ou contenants sous pression - Google Patents

Dispositif de sécurité pour soupapes et/ou contenants sous pression Download PDF

Info

Publication number
WO2010136908A1
WO2010136908A1 PCT/IB2010/051336 IB2010051336W WO2010136908A1 WO 2010136908 A1 WO2010136908 A1 WO 2010136908A1 IB 2010051336 W IB2010051336 W IB 2010051336W WO 2010136908 A1 WO2010136908 A1 WO 2010136908A1
Authority
WO
WIPO (PCT)
Prior art keywords
shutter
safety device
retaining means
ambient temperature
threshold temperature
Prior art date
Application number
PCT/IB2010/051336
Other languages
English (en)
Inventor
Davide Cavagna
Original Assignee
Cavagna Group 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 Cavagna Group S.P.A. filed Critical Cavagna Group S.P.A.
Publication of WO2010136908A1 publication Critical patent/WO2010136908A1/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
    • F16K17/36—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 subject of the present invention is a safety device for valves and/or containers under pressure, of the type described in the preamble of the main claim.
  • safety devices which permit the outflow from a source of gas under pressure into the atmosphere when the ambient temperature exceeds a threshold value, for example as a result of a fire.
  • breather valves for example valves which also comprise overpressure devices, or on containers under pressure, either for low pressure, for example LPG containers, or for high pressure.
  • a safety device of the above-mentioned type is known for example from European Patent EP 1295056, intended particularly for LPG tanks for motor vehicles.
  • This document describes a safety device comprising a shutter which closes off the passage of gas from the tank into the atmosphere and on which acts a spring that can be preloaded by means of a calibrating spring.
  • a spacer ring of material Interposed between the screw and the spring is a spacer ring of material that is fusible when the ambient temperature exceeds a predetermined threshold value.
  • the preloading of the spring is effected in such a way that normally, of the forces acting on the shutter, the resilient force is greater than the pressure force, and consequently the device is closed, preventing the escape of the gas from the tank.
  • the spacer ring melts, the spring, completely or partially, loses the preloading such that the pressure force prevails over the resilient force, resulting in the displacement of the shutter, the opening of the device and the consequent outflow of the gas from the tank.
  • the aim of the present invention is to provide a safety device for valves and/or containers under pressure that is structurally and. functionally designed so as to remedy all the drawbacks mentioned with reference to the prior art cited.
  • Figure 1 is an axonometric view of a safety device according to the present invention
  • Figure 2 is a sectional side view of the device of Figure 1;
  • Figure 3 is a view corresponding to that of Figure 2, in a different operative configuration
  • Figures 4 and 5 are two views, corresponding to those of Figures 2 and 3, of an alternative embodiment of the safety device of Figure 1.
  • Figure 6 is an axonometric view of an alternative embodiment of the safety device of Figure 1. Preferred embodiment of the invention
  • the reference 10 indicates as a whole a safety device according to the present invention.
  • the device 10 lends itself particularly, although not exclusively, to being fitted on safety valves, for example overpressure valves, or on containers or tanks under pressure.
  • the device may conveniently be used in all cases where the outflow of gas from a source under pressure is required when the ambient temperature exceeds a predetermined threshold value, for example because of a fire.
  • the safety device 10 comprises a body 1 and a connector 12 connected to the body 1, by means of a screw thread 11a.
  • the body 1 and the connector 12 are incorporated with each other in a single member.
  • the connector 12 is directly integral with a valve body or other device for interface with respect to a tank under pressure.
  • the safety device 10 further comprises a shutter 5 translatable with respect to the body 1, along the longitudinal axis X, between a closed position ( Figures 2 and 4) and an open position ( Figures 3 and 5).
  • a first end 5a of the shutter 5 closes the passage 11, a seal being housed therein.
  • the coupling between the end 5a of the shutter 5 and the passage 11 is of the piston/cylinder type.
  • the passing of gas between the shutter 5 and the passage 11 is in fact prevented by the effect of a rubber sealing ring 2 and an anti-extrusion ring 3, which are housed in a groove 13 provided on the shutter 5 in proximity to the first end 5a.
  • the shutter 5 In the open position the shutter 5 is distanced from the passage 11 so as to permit the outflow of the gas from the source into the atmosphere via a plurality of passages 12a provided in the body 1 transversely to the longitudinal axis X.
  • the passages 12a are provided in the body 1 also in a direction parallel to the longitudinal axis X.
  • the openings 12a are provided on the connector 12.
  • the shutter 5 comprises retaining means 4, 7 for locking the shutter 5 in the closed position.
  • the retaining means 4, 7 are at least partially deformable by the effect of the increase in the ambient temperature above a threshold temperature, in order to permit the displacement of the shutter 5 into the open position.
  • the threshold temperature depends on the material of the retaining means 4, 7 and is selected such as to ensure the passage of the gas before the resistance characteristics of the assembly formed by the device and the gas source are compromised. Typical values of the threshold temperature are between 7O 0 C and 150 0 C. More particularly, typical values of the threshold temperature are between 9O 0 C and 15O 0 C.
  • the retaining means comprise an insert 7, provided in the shutter 5, and made of low-melting material, that is to say, which melts when the ambient temperature is above the threshold temperature defined above.
  • the insert 7 is made of eutectic alloy.
  • the retaining means further comprise a plurality of locking members 4, spherical in shape and housed in respective seats 4a provided in a containing member 8 placed at a second end 5b, longitudinally opposed with respect to the first end 5a of the shutter 5.
  • the retaining means further comprise a control surface 6 provided by means of a shoulder in the body 1.
  • the locking members 4 are partially incorporated in the insert 7 so as to be retained in the respective seats 4a, arrested by the control surface 6 as long as the ambient temperature is below the threshold temperature. As soon as the ambient temperature exceeds the threshold temperature, the insert 7 melts and the locking members 4 become movable in the respective seats 4a away from the checking surface 6.
  • the insert 7 is of such dimensions that the passage from the solid to the liquid state of the alloy is sufficient to permit the movement of the locking members 4 and thus to allow the intervention of the device 10. Since the device 10 requires a minimum displacement of the locking members 4 to intervene, the amount of material used for the insert 7 may be considerably reduced.
  • the device 10 operates as follows: when the ambient temperature is below the threshold temperature, the retaining means 4 are locked against the control surface 6, so as to retain the shutter 5 in the closed position. As soon as the ambient temperature exceeds the threshold temperature, the shutter 5 is free to move with respect to the control surface 6 as a result of the deformation of the retaining means 4, 7, that is to say, of the melting (even partial) or the softening of the insert 7, and of the displacement of the spherical locking members 4 in the respective seats 4a. The disengagement of the spherical locking members 4 from the control surface 6 takes place as soon as the melting or softening of the insert 7 starts, instantaneously allowing the complete opening of the passage cross- sections 11 and 12a and permitting the escape of the gas. Any cooling of the insert 7 during the expansion stage is not capable of bringing the system back to the initial closure state nor of limiting the displacement of the shutter 5 in any way.
  • the containing member 8 of the shutter 5 comprises a shoulder 8a capable of abutting the shoulder 6 in order to prevent the complete escape of the shutter when the latter is in the open position ( Figure 3).
  • Figures 4 and 5 show an alternative embodiment, indicated as a whole by 100, of the present invention. Elements having a similar function with respect to the variant of Figures 2 and 3 are indicated by the same reference numbers.
  • the retaining means comprise, besides the insert 7 and the locking members 4, an opposing member 28, and resilient means, for example a preloaded spring 29, interposed between the opposing member 28 and a ring nut 30 integral with the body 1.
  • the seats 4a for the locking members 4 and the insert 7 are provided in the opposing member 28, the locking members 4 being partially incorporated in the insert 7 so as to be arrested in the respective seats 4a, abutting a control surface 26 provided in a cavity 5c inside the shutter 5, so as to retain the shutter 5 in the closed position.
  • the device 100 may therefore also function as an overpressure valve, by calibrating the preloading of the spring 29 in such a way that when the pressure in the passage cross-section 11 exceeds a predetermined value, the shutter 5 is pushed towards the open position.
  • the invention thus achieves the aims proposed with respect to the prior art cited, avoiding the possibility of even partial re-closure and the limitation of the passage cross-sections during the discharge stage.
  • a further advantage lies in the fact of having incorporated the element, deformable by the effect of the increase in the temperature, in the shutter, in this way limiting the number of individually manipulable elements which form the device, at the same time making its assembly simpler and its operation more efficient.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Safety Valves (AREA)

Abstract

L'invention porte sur un dispositif de sécurité pour des soupapes et/ou des contenants sous pression, lequel dispositif comprend : un corps (1), dans lequel est disposé un passage apte à être relié à une source de gaz sous pression, un obturateur (5) apte à se translater par rapport au corps entre une position fermée, dans laquelle une extrémité de l'obturateur ferme le passage, et une position ouverte dans laquelle l'obturateur est éloigné dudit passage de façon à permettre l'écoulement extérieur de gaz dans l'atmosphère à partir de la source. L'obturateur comprend des moyens de retenue (4) destinés à verrouiller ce dernier dans la position fermée. Ces moyens de retenue sont au moins partiellement déformables par l'effet de l'augmentation de la température ambiante au-dessus d'une température de seuil afin de permettre le déplacement de l'obturateur dans la position ouverte.
PCT/IB2010/051336 2009-05-25 2010-03-26 Dispositif de sécurité pour soupapes et/ou contenants sous pression WO2010136908A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2009A000150 2009-05-25
ITPD2009A000150A IT1394323B1 (it) 2009-05-25 2009-05-25 Dispositivo di sicurezza per valvole e/o recipienti in pressione

Publications (1)

Publication Number Publication Date
WO2010136908A1 true WO2010136908A1 (fr) 2010-12-02

Family

ID=41394130

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/051336 WO2010136908A1 (fr) 2009-05-25 2010-03-26 Dispositif de sécurité pour soupapes et/ou contenants sous pression

Country Status (3)

Country Link
AR (1) AR076792A1 (fr)
IT (1) IT1394323B1 (fr)
WO (1) WO2010136908A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2966328A4 (fr) * 2013-03-04 2016-11-16 Kawasaki Heavy Ind Ltd Soupape de sûreté du type à bouchon fusible
WO2021057716A1 (fr) * 2019-09-26 2021-04-01 未势能源科技有限公司 Soupape de surpression à activation thermique
WO2022270795A1 (fr) * 2021-06-23 2022-12-29 영도산업 주식회사 Dispositif de décompression pour récipient haute pression
WO2023027326A1 (fr) * 2021-08-25 2023-03-02 영도산업 주식회사 Dispositif de décompression pour récipient haute pression

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE530601C (de) * 1930-09-18 1931-09-18 Luther Daniel Lovekin Sicherheitsventil
US1944518A (en) * 1931-06-26 1934-01-23 Kitson Company Temperature and pressure relief valve device
US4221231A (en) * 1976-02-27 1980-09-09 Dunlop Limited Thermal fuse device
US20050150548A1 (en) * 2003-03-02 2005-07-14 Toshio Kita Safety valve
EP1691120A1 (fr) * 2005-02-14 2006-08-16 Luxembourg Patent Company S.A. Soupape de sécurité à activation thermique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE530601C (de) * 1930-09-18 1931-09-18 Luther Daniel Lovekin Sicherheitsventil
US1944518A (en) * 1931-06-26 1934-01-23 Kitson Company Temperature and pressure relief valve device
US4221231A (en) * 1976-02-27 1980-09-09 Dunlop Limited Thermal fuse device
US20050150548A1 (en) * 2003-03-02 2005-07-14 Toshio Kita Safety valve
EP1691120A1 (fr) * 2005-02-14 2006-08-16 Luxembourg Patent Company S.A. Soupape de sécurité à activation thermique

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2966328A4 (fr) * 2013-03-04 2016-11-16 Kawasaki Heavy Ind Ltd Soupape de sûreté du type à bouchon fusible
US9702473B2 (en) 2013-03-04 2017-07-11 Kawasaki Jukogyo Kabushiki Kaisha Fusible plug type pressure relief valve
WO2021057716A1 (fr) * 2019-09-26 2021-04-01 未势能源科技有限公司 Soupape de surpression à activation thermique
WO2022270795A1 (fr) * 2021-06-23 2022-12-29 영도산업 주식회사 Dispositif de décompression pour récipient haute pression
KR20220170517A (ko) * 2021-06-23 2022-12-30 영도산업 주식회사 고압용기용 압력해제장치
KR102515443B1 (ko) * 2021-06-23 2023-03-29 영도산업 주식회사 고압용기용 압력해제장치
WO2023027326A1 (fr) * 2021-08-25 2023-03-02 영도산업 주식회사 Dispositif de décompression pour récipient haute pression

Also Published As

Publication number Publication date
IT1394323B1 (it) 2012-06-06
AR076792A1 (es) 2011-07-06
ITPD20090150A1 (it) 2010-11-26

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