WO2008129209A1 - A pressure limiting valve for a gas, particularly for the air conditioning system of an automobile - Google Patents

A pressure limiting valve for a gas, particularly for the air conditioning system of an automobile Download PDF

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Publication number
WO2008129209A1
WO2008129209A1 PCT/FR2008/050448 FR2008050448W WO2008129209A1 WO 2008129209 A1 WO2008129209 A1 WO 2008129209A1 FR 2008050448 W FR2008050448 W FR 2008050448W WO 2008129209 A1 WO2008129209 A1 WO 2008129209A1
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WO
WIPO (PCT)
Prior art keywords
valve
gas
seat
pressure
gas inlet
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PCT/FR2008/050448
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French (fr)
Inventor
Pierrick Pelletier
François Marion
Original Assignee
Schrader Sas
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 Schrader Sas filed Critical Schrader Sas
Publication of WO2008129209A1 publication Critical patent/WO2008129209A1/en

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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
    • F16K17/04—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
    • F16K17/0406—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 in the form of balls

Definitions

  • the present invention relates to a valve for limiting the pressure of a gas, more particularly adapted to the use of carbon dioxide (CO 2 ) in air conditioning systems of motor vehicles.
  • CO 2 carbon dioxide
  • the air conditioning systems operate from fluorinated gas having the drawback of harming the environment, and more particularly ozone.
  • Directive 2006/40 / EC aims to reduce and then specifically prohibit the use of fluorinated gases by 2017 in the air-conditioning systems of motor vehicles.
  • CO 2 are very low (maximum lg / yr of CO 2 ).
  • the standards therefore require the use of mechanical safety devices that are able to limit the pressure in the various circuits (120 and 160 bars) of the air conditioning line, essentially caused by an increase in the temperature, but also by a bad charging rate, when filling the air conditioning line.
  • the valve must therefore be able to limit the pressure by opening to let the gas out of the air conditioning line when the pressure is too high, and closing when this pressure in the circuit has decreased. It is known to remedy these drawbacks, in particular as regards the temperature rise having a consequence on the pressure, by using pressure limiting valves of the type constituted by a hollow body passing through, having an open bottom outlet of the gas, against which rests an elastic member calibrated as a function of the pressure to be regulated, and connected at its other end with a closure member forming a valve, intended to cooperate in closure with a corresponding seat of a calibrated nozzle gas inlet.
  • the closure member may be constituted by a steel ball, of course supporting the temperature, but which also has the disadvantage of being of a hardness such as rendering it indeformable, which induces, when it is supported with a spherical seat, poor contact, and therefore the risk of gas leakage.
  • the object of the present invention is to overcome these disadvantages, and for this purpose valve for limiting the pressure of a gas, more particularly adapted to the use of carbon dioxide (CO 2 ) in air-conditioning systems for motor vehicles, and of the type consisting of a hollow body passing through, having an open bottom of gas outlet, against which rests an elastic member calibrated as a function of the pressure to be regulated, and connected at its other end with a closing member spherical valve forming a valve for cooperating in closure with a corresponding seat d a calibrated gas inlet nozzle, characterized in that the closure element is constituted by a spherical cap, surmounting a guide piston with which it is connected and made of an elastically deformable material, self-locking Hermetically fitting on the gas inlet seat and able to withstand the high pressure and temperature associated with the use of CO 2 .
  • CO 2 carbon dioxide
  • the invention also relates to the features which will emerge during the following description, which should be considered in isolation or in all their possible technical combinations.
  • Figure 1 is a perspective view of a pressure limiting valve of a gas according to the invention, mounted on an element of the vehicle air conditioning system.
  • Figure 2 is a perspective view of the pressure limiting valve according to the invention, isolated from the air conditioning system.
  • FIG. 3 is a perspective view in longitudinal section along line III - III of FIG. 2.
  • FIG. 4 is a sectional view, according to FIG.
  • valve 1 for limiting the pressure of a gas is shown mounted on an element 2 of the air conditioning system of a motor vehicle.
  • this valve 1 is constituted by a hollow hollow body 3 having an open bottom outlet gas SG, against which bears an elastic member 5, calibrated according to the pressure to be regulated, and connected to its other end with a shutter member 7 with a spherical bearing forming a valve, intended to cooperate in closure with a corresponding seat 8 of a calibrated nozzle 9 for gas inlet
  • the closure element 7 is constituted by a spherical cap, surmounting a guide piston 6 with which it is connected and made of an elastically deformable material, self-adapting hermetically on the seat 8 EG gas inlet and able to withstand the high pressure and temperature associated with the use of CO 2 .
  • the elastically deformable material of the spherical cap constituting the closure element is a thermoplastic polymer.
  • thermoplastic polymer based on polyimide
  • the seat 8 of the gas inlet nozzle 9 EG is constituted by a truncated cone.
  • the seat of the gas inlet nozzle is constituted by the circular rim of the nozzle itself.
  • the valve is connected to an element 2 of the system of air conditioning of the vehicle, via an external threaded portion 10 of the body 3 screwing into a corresponding threaded housing 11 of the element 2, the sealing between one and the other of the parts being carried out directly, metal against metal, between on the one hand a sharp edge 12 of an outgoing shoulder 13, formed on the outer surface of the valve body 3, beyond its threaded portion 10, and on the other hand an area of revolution frustoconical 14 made on the element 2, below its thread 11.
  • the metallic materials constituting the valve body 1 and the element 2 where it is screwed are of different hardness, so as to obtain, under the effect of a tightening torque, the deformation of the one or the other material, having the effect of completing the seal.
  • These different materials may for example be made of brass against aluminum, or stainless steel against brass, or any other type of material.

Abstract

The invention relates to a pressure limiting valve for a gas, more particularly adapted for use with carbon dioxide (CO2) in an automobile air conditioning system, and of the type composed of a hollow body crosspiece (3), having an open gas outlet bottom (SG), against which rest an elastic organ (5), tarred according to the pressure to be regulated, and linked at its other end with a filling element (7) which are spherical discs forming a valve, intended to engage during closure with a corresponding seat (8) of a calibrated nozzle (9) of gas input (EG), characterized in that the filling element (7) is composed of a ball bushing, surmounting a guiding piston with which it is linked and made of an elastically deformable material, hermetically auto-adapting on the gas input (EG) seat (8) and capable of resisting the high pressures and temperatures of CO2 use.

Description

VALVE DE LIMITATION DE PRESSION D'UN GAZ, NOTAMMENT POUR SYSTEME DE CLIMATISATION DE VEHICULES A MOTEUR VALVE FOR LIMITING THE PRESSURE OF A GAS, IN PARTICULAR FOR AIR CONDITIONING SYSTEM OF MOTOR VEHICLES
La présente invention concerne une valve de limitation de pression d'un gaz, plus particulièrement adaptée à l'utilisation du dioxyde de carbone (CO2) dans les systèmes de climatisation de véhicules à moteur.The present invention relates to a valve for limiting the pressure of a gas, more particularly adapted to the use of carbon dioxide (CO 2 ) in air conditioning systems of motor vehicles.
A l'heure actuelle, les systèmes de climatisation fonctionnent à partir de gaz fluoré ayant pour inconvénient de nuire à l'environnement, et plus particulièrement à l'ozone.At present, the air conditioning systems operate from fluorinated gas having the drawback of harming the environment, and more particularly ozone.
C'est pourquoi le protocole de Kyoto prévoit, dans les quatre années à venir, de réduire les émissions des gaz à effet de serre de 8% par rapport au niveau deThis is why the Kyoto Protocol provides, in the next four years, to reduce greenhouse gas emissions by 8% compared to the level of
1'1 '
Egalement, la directive 2006/40/CE vise à réduire puis interdire précisément l'utilisation des gaz fluorés d'ici à 2017 dans les systèmes de climatisation des véhicules à moteur.Also, Directive 2006/40 / EC aims to reduce and then specifically prohibit the use of fluorinated gases by 2017 in the air-conditioning systems of motor vehicles.
Une des solutions envisagées est donc de remplacer le gaz fluoré utilisé actuellement par du dioxyde de carbone (CO2), 1300 fois moins nocif pour l'ozone que le gaz fluoré. Mais le passage du gaz fluoré au dioxyde de carbone n'est pas sans inconvénient sur l'installation de climatisation.One of the solutions envisaged is therefore to replace the fluorinated gas currently used with carbon dioxide (CO 2 ), 1300 times less harmful for ozone than the fluorinated gas. But the passage of fluorinated gas to carbon dioxide is not without drawback on the air conditioning system.
En effet, nous pouvons dénombrer les inconvénients suivants : les pressions de fonctionnement sont plus élevées (120 et 160 bars, contre 30-40 bars actuellement) , - les températures de fonctionnement sont plus élevées (jusqu'à 180 degrés centigrades en pointe) , la compatibilité des matériaux avec le CO2 est mauvaise, notamment avec les élastomères, - les taux de fuite ou perméabilité admis avec leIndeed, we can count the following drawbacks: operating pressures are higher (120 and 160 bar, against 30-40 bar currently), - the operating temperatures are higher (up to 180 degrees centigrade peak), the compatibility of the materials with the CO 2 is bad, in particular with the elastomers, - the leakage or permeability rates admitted with the
CO2 sont très faibles (maximum lg/an de CO2) .CO 2 are very low (maximum lg / yr of CO 2 ).
Pour le passage au CO2, les normes exigent donc l'utilisation d'organes de sécurité mécaniques qui soient capables de limiter la pression dans les différents circuits (120 et 160 bars) de la ligne de climatisation, essentiellement engendrée par une augmentation de la température, mais aussi par un mauvais taux de charge, lors du remplissage de la ligne de climatisation.For the passage to CO 2 , the standards therefore require the use of mechanical safety devices that are able to limit the pressure in the various circuits (120 and 160 bars) of the air conditioning line, essentially caused by an increase in the temperature, but also by a bad charging rate, when filling the air conditioning line.
La valve devra donc pouvoir limiter la pression en s' ouvrant pour laisser le gaz sortir de la ligne de climatisation lorsque la pression est trop élevée, et en se fermant lorsque cette pression dans le circuit aura diminué. II est connu de remédier à ces inconvénients, notamment en ce qui concerne l'élévation de température ayant une conséquence sur la pression, en utilisant des valves de limitation de pression du type constituées par un corps creux traversant, présentant un fond ouvert de sortie du gaz, contre lequel prend appui un organe élastique, taré en fonction de la pression à réguler, et en liaison à son autre extrémité avec un élément d'obturation formant clapet, destiné à coopérer en fermeture avec un siège correspondant d'un ajutage calibré d'entrée du gaz.The valve must therefore be able to limit the pressure by opening to let the gas out of the air conditioning line when the pressure is too high, and closing when this pressure in the circuit has decreased. It is known to remedy these drawbacks, in particular as regards the temperature rise having a consequence on the pressure, by using pressure limiting valves of the type constituted by a hollow body passing through, having an open bottom outlet of the gas, against which rests an elastic member calibrated as a function of the pressure to be regulated, and connected at its other end with a closure member forming a valve, intended to cooperate in closure with a corresponding seat of a calibrated nozzle gas inlet.
Dans ces valves connues, l'élément d'obturation peut être constituée par une bille en acier, supportant bien entendu la température, mais qui présente par ailleurs l'inconvénient d'être d'une dureté telle la rendant indéformable, ce qui induit, lorsqu'elle est en appui avec un siège sphérique, un mauvais contact, et par conséquent des risques de fuite de gaz.In these known valves, the closure member may be constituted by a steel ball, of course supporting the temperature, but which also has the disadvantage of being of a hardness such as rendering it indeformable, which induces, when it is supported with a spherical seat, poor contact, and therefore the risk of gas leakage.
De plus, une telle bille sphérique est montée libre en rotation dans tous les sens et, à terme, il y a une possibilité de mauvais repositionnement sur le siège conique, ce qui peut provoquer encore une fois des fuites par mauvais contact.In addition, such a spherical ball is rotatably mounted in all directions and eventually there is a possibility of poor repositioning on the conical seat, which can cause again leakage by poor contact.
On pourrait imaginer associer un joint au siège, mais les joints connus sont incompatibles et perméables au CO2, à la température et à la pression en présence.One could imagine associating a seal to the seat, but the known joints are incompatible and permeable to CO 2 , the temperature and the pressure in the presence.
La présente invention a pour but de remédier à ces derniers inconvénients, et concerne à cet effet une valve de limitation de pression d'un gaz, plus particulièrement adaptée à l'utilisation du dioxyde de carbone (CO2) dans les systèmes de climatisation de véhicules à moteur, et du type constituée par un corps creux traversant, présentant un fond ouvert de sortie du gaz, contre lequel prend appui un organe élastique, taré en fonction de la pression à réguler, et en liaison à son autre extrémité avec un élément d'obturation à portée sphérique formant clapet, destiné à coopérer en fermeture avec un siège correspondant d'un ajutage calibré d'entrée du gaz, caractérisée en ce que l'élément d'obturation est constitué par une calotte sphérique, surmontant un piston de guidage avec lequel elle est en liaison et réalisée en un matériau élastiquement déformable, s' auto-adaptant hermétiquement sur le siège d'entrée du gaz et apte à résister aux hautes pression et température liées à l'utilisation du CO2.The object of the present invention is to overcome these disadvantages, and for this purpose valve for limiting the pressure of a gas, more particularly adapted to the use of carbon dioxide (CO 2 ) in air-conditioning systems for motor vehicles, and of the type consisting of a hollow body passing through, having an open bottom of gas outlet, against which rests an elastic member calibrated as a function of the pressure to be regulated, and connected at its other end with a closing member spherical valve forming a valve for cooperating in closure with a corresponding seat d a calibrated gas inlet nozzle, characterized in that the closure element is constituted by a spherical cap, surmounting a guide piston with which it is connected and made of an elastically deformable material, self-locking Hermetically fitting on the gas inlet seat and able to withstand the high pressure and temperature associated with the use of CO 2 .
L'invention concerne également les caractéristiques qui ressortiront au cours de la description qui va suivre, et qui devront être considérées isolément ou selon toutes leurs combinaisons techniques possibles.The invention also relates to the features which will emerge during the following description, which should be considered in isolation or in all their possible technical combinations.
Cette description donnée à titre d'exemple non limitatif, fera mieux comprendre comment l'invention peut être réalisée en référence aux dessins annexés sur lesquels : La figure 1 est une vue en perspective d'une valve de limitation de pression d'un gaz selon l'invention, montée sur un élément du système de climatisation de véhicule . La figure 2 est une vue en perspective de la valve de limitation de pression selon l'invention, isolée du système de climatisation.This description given by way of nonlimiting example, will better understand how the invention can be made with reference to the accompanying drawings in which: Figure 1 is a perspective view of a pressure limiting valve of a gas according to the invention, mounted on an element of the vehicle air conditioning system. Figure 2 is a perspective view of the pressure limiting valve according to the invention, isolated from the air conditioning system.
La figure 3 est une vue en perspective et en coupe longitudinale selon la III-III de la figure 2.FIG. 3 is a perspective view in longitudinal section along line III - III of FIG. 2.
La figure 4 est une vue en coupe, selon la figure 3.FIG. 4 is a sectional view, according to FIG.
Comme le montre la figure 1, la valve 1 de limitation de pression d'un gaz est représentée montée sur un élément 2 du système de climatisation d'un véhicule à moteur.As shown in Figure 1, the valve 1 for limiting the pressure of a gas is shown mounted on an element 2 of the air conditioning system of a motor vehicle.
Classiquement, cette valve 1 est constituée par un corps creux traversant 3 présentant un fond ouvert de sortie du gaz SG, contre lequel prend appui un organe élastique 5, taré en fonction de la pression à réguler, et en liaison à son autre extrémité avec un élément d'obturation 7 à portée sphérique formant clapet, destiné à coopérer en fermeture avec un siège correspondant 8 d'un ajutage calibré 9 d'entrée du gazClassically, this valve 1 is constituted by a hollow hollow body 3 having an open bottom outlet gas SG, against which bears an elastic member 5, calibrated according to the pressure to be regulated, and connected to its other end with a shutter member 7 with a spherical bearing forming a valve, intended to cooperate in closure with a corresponding seat 8 of a calibrated nozzle 9 for gas inlet
EG.EG.
Selon l'invention, l'élément d'obturation 7 est constitué par une calotte sphérique, surmontant un piston de guidage 6 avec lequel elle est en liaison et réalisée en un matériau élastiquement déformable, s' auto-adaptant hermétiquement sur le siège 8 d'entrée du gaz EG et apte à résister aux hautes pression et température liées à l'utilisation du CO2. Selon une autre caractéristique de l'invention, le matériau élastiquement déformable de la calotte sphérique constituant l'élément d'obturation est un polymère thermoplastique.According to the invention, the closure element 7 is constituted by a spherical cap, surmounting a guide piston 6 with which it is connected and made of an elastically deformable material, self-adapting hermetically on the seat 8 EG gas inlet and able to withstand the high pressure and temperature associated with the use of CO 2 . According to another characteristic of the invention, the elastically deformable material of the spherical cap constituting the closure element is a thermoplastic polymer.
Différents essais ont conduit à préférer un polymère thermoplastique à base de polyimide.Various attempts have led to the preference of a thermoplastic polymer based on polyimide.
Dans la recherche d'un polyimide idéal pour ce genre d'application, il a pu être observé que le produit commercialisé sous la marque déposée « Vespel » par la société DuPont présentait d'excellentes caractéristiques de tenue à la température, et conséquemment aux pressions, tout en présentant une capacité à se déformer élastiquement.In the search for an ideal polyimide for this type of application, it has been observed that the product marketed under the trademark "Vespel" by the company DuPont exhibited excellent temperature resistance characteristics, and consequently the pressures while having the ability to deform elastically.
Bien entendu, d'autres types de matériaux pourraient être adoptés, le principe de l'invention portant sur un matériau élastiquement déformable s' auto-adaptant hermétiquement sur le siège 8 d'entrée de gaz EG (comme déjà évoqué ci-dessus) .Of course, other types of materials could be adopted, the principle of the invention on a resiliently deformable material self-adapting hermetically on the EG gas inlet seat 8 (as already mentioned above).
Selon une autre caractéristique de l'invention, le siège 8 de l'ajutage 9 d'entrée de gaz EG est constitué par un tronc de cône.According to another characteristic of the invention, the seat 8 of the gas inlet nozzle 9 EG is constituted by a truncated cone.
Selon une variante non représentée, le siège de l'ajutage d'entrée de gaz est constitué par le rebord circulaire de l'ajutage même.According to a variant not shown, the seat of the gas inlet nozzle is constituted by the circular rim of the nozzle itself.
Selon une autre caractéristique de l'invention, la valve est raccordée à un élément 2 du système de climatisation du véhicule, par l'intermédiaire d'une partie filetée externe 10 du corps 3 se vissant dans un logement fileté correspondant 11 de l'élément 2, l'étanchéité entre l'une et l'autre des parties s' effectuant directement, métal contre métal, entre d'une part une arête vive 12 d'un épaulement sortant 13, réalisé sur la surface externe du corps 3 de valve 1, au-delà de sa partie filetée 10, et d'autre part une zone de révolution tronconique 14 réalisée sur l'élément 2, au dessous de son filetage 11.According to another characteristic of the invention, the valve is connected to an element 2 of the system of air conditioning of the vehicle, via an external threaded portion 10 of the body 3 screwing into a corresponding threaded housing 11 of the element 2, the sealing between one and the other of the parts being carried out directly, metal against metal, between on the one hand a sharp edge 12 of an outgoing shoulder 13, formed on the outer surface of the valve body 3, beyond its threaded portion 10, and on the other hand an area of revolution frustoconical 14 made on the element 2, below its thread 11.
Préférentiellement, les matériaux métalliques constituant le corps 3 de valve 1 et l'élément 2 où il se visse sont de dureté différente, de manière à obtenir, sous l'effet d'un couple de serrage, la déformation de l'un ou de l'autre matériau, ayant pour effet de parfaire l'étanchéité.Preferably, the metallic materials constituting the valve body 1 and the element 2 where it is screwed are of different hardness, so as to obtain, under the effect of a tightening torque, the deformation of the one or the other material, having the effect of completing the seal.
Ces matériaux différents pourront être par exemple constitués par laiton contre aluminium, ou encore acier inoxydable contre laiton, ou tout autre type de matériau . These different materials may for example be made of brass against aluminum, or stainless steel against brass, or any other type of material.

Claims

REVENDICATIONS
1. Valve (1) de limitation de pression d'un gaz, plus particulièrement adaptée à l'utilisation du dioxyde de carbone (CO2) dans les systèmes de climatisation de véhicules à moteur, et du type constituée par un corps creux traversant (3) , présentant un fond ouvert de sortie du gaz (SG) , contre lequel prend appui un organe élastique (5) , taré en fonction de la pression à réguler, et en liaison à son autre extrémité avec un élément d'obturation (7) à portée sphérique formant clapet, destiné à coopérer en fermeture avec un siège correspondant (8) d'un ajutage calibré (9) d'entrée du gaz (EG), caractérisée en ce que l'élément d'obturation (7) est constitué par une calotte sphérique, surmontant un piston de guidage (6) avec lequel elle est en liaison et réalisée en un matériau élastiquement déformable, à savoir un polymère thermoplastique s' auto-adaptant hermétiquement sur le siège (8) d'entrée du gaz (EG) et apte à résister aux hautes pression et température liées à l'utilisation du CO2.1. Valve (1) for limiting the pressure of a gas, more particularly adapted to the use of carbon dioxide (CO 2 ) in air-conditioning systems of motor vehicles, and of the type consisting of a hollow body passing through ( 3), having an open bottom gas outlet (SG), against which rests an elastic member (5), calibrated according to the pressure to be regulated, and connected at its other end with a closure member (7). ) with a spherical valve-forming surface intended to cooperate in closure with a corresponding seat (8) of a calibrated gas inlet nozzle (9) (EG), characterized in that the closure element (7) is consisting of a spherical cap, surmounting a guide piston (6) with which it is connected and made of an elastically deformable material, namely a thermoplastic polymer self-adapting hermetically on the seat (8) of the gas inlet (EG) and able to withstand high pressure on and temperature related to the use of CO 2 .
2. Valve (1) de limitation de pression d'un gaz, plus particulièrement adaptée à l'utilisation du dioxyde de carbone (CO2) dans les systèmes de climatisation de véhicules à moteur, et du type constituée par un corps creux traversant (3) , présentant un fond ouvert de sortie du gaz (SG) , contre lequel prend appui un organe élastique (5) , taré en fonction de la pression à réguler, et en liaison à son autre extrémité avec un élément d'obturation (7) à portée sphérique formant clapet, destiné à coopérer en fermeture avec un siège correspondant (8) d'un ajutage calibré (9) d'entrée du gaz (EG), caractérisée en ce que l'élément d'obturation (7) est constitué par une calotte sphérique, surmontant un piston de guidage (6) avec lequel elle est en liaison et réalisée en un matériau élastiquement déformable, à base de polyimide, s' auto-adaptant hermétiquement sur le siège (8) d'entrée du gaz (EG) et apte à résister aux hautes pression et température liées à l'utilisation du CO2.2. Valve (1) for limiting the pressure of a gas, more particularly adapted to the use of carbon dioxide (CO 2 ) in air-conditioning systems of motor vehicles, and of the type constituted by a hollow body ( 3), having an open bottom gas outlet (SG), against which rests an elastic member (5) calibrated according to the pressure to be regulated, and in connection with its other end with a closure element (7) with a spherical bearing forming a valve, intended to cooperate in closure with a corresponding seat (8) of a calibrated gas inlet nozzle (9) (EG), characterized in that the closure element (7) is constituted by a spherical cap, surmounting a guide piston (6) with which it is connected and made of an elastically deformable material, based on polyimide, self-adapting tightly on the seat (8) gas inlet (EG) and able to withstand the high pressure and temperature related to the use of CO 2 .
3. Valve selon l'une des revendications 1 ou 2, caractérisée en ce que le siège (8) de l'ajutage (9) d'entrée de gaz (EG) est constitué par un tronc de cône .3. Valve according to one of claims 1 or 2, characterized in that the seat (8) of the nozzle (9) gas inlet (EG) is constituted by a truncated cone.
4. Valve selon l'une des revendications 1 ou 2, caractérisée en ce que le siège de l'ajutage d'entrée de gaz est constitué par le rebord circulaire de l'ajutage même.4. Valve according to one of claims 1 or 2, characterized in that the seat of the gas inlet nozzle is constituted by the circular rim of the nozzle itself.
5. Valve selon l'une des revendications 1 à 4, caractérisée en ce qu'elle est raccordée à un élément (2) du système de climatisation du véhicule, par l'intermédiaire d'une partie filetée externe (10) du corps (3) se vissant dans un logement fileté correspondant (11) de l'élément (2), l'étanchéité entre l'une et l'autre des parties s' effectuant directement, métal contre métal, entre d'une part une arête vive (12) d'un épaulement sortant (13), réalisé sur la surface externe du corps (3) de valve (1), au-delà de sa partie filetée (10), et d'autre part une zone de révolution tronconique (14) réalisée sur l'élément (2), au dessous de son filetage (11) .5. Valve according to one of claims 1 to 4, characterized in that it is connected to an element (2) of the air conditioning system of the vehicle, via an external threaded portion (10) of the body ( 3) being screwed into a corresponding threaded housing (11) of the element (2), the sealing between one and the other of the parts being carried out directly, metal against metal, between on the one hand a sharp edge (12) an outward shoulder (13) formed on the outer surface of the valve body (3), beyond its threaded portion (10), and secondly a frustoconical revolution zone (14) made on the element (2), below its thread (11).
6. Valve selon la revendication 4, caractérisée en ce que les matériaux métalliques constituant le corps (3) de valve (1) et l'élément (2) où il se visse sont de dureté différente, de manière à obtenir, sous l'effet d'un couple de serrage, la déformation de l'un ou de l'autre matériau, ayant pour effet de parfaire 1' étanchéité . 6. Valve according to claim 4, characterized in that the metallic materials constituting the body (3) of the valve (1) and the element (2) where it is screwed are of different hardness, so as to obtain, under the effect of a tightening torque, the deformation of one or the other material, having the effect of completing the seal.
PCT/FR2008/050448 2007-03-16 2008-03-14 A pressure limiting valve for a gas, particularly for the air conditioning system of an automobile WO2008129209A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0701925 2007-03-16
FR0701925A FR2913745A1 (en) 2007-03-16 2007-03-16 VALVE FOR LIMITING GAS PRESSURE, ESPECIALLY FOR AIR CONDITIONING SYSTEM OF MOTOR VEHICLES

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WO2008129209A1 true WO2008129209A1 (en) 2008-10-30

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PCT/FR2008/050448 WO2008129209A1 (en) 2007-03-16 2008-03-14 A pressure limiting valve for a gas, particularly for the air conditioning system of an automobile

Country Status (2)

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FR (1) FR2913745A1 (en)
WO (1) WO2008129209A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024016041A1 (en) 2022-07-21 2024-01-25 Ventrex Automotive Gmbh Pressure-relief valve for releasing an excess pressure of a gas in a controlled manner

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147739A5 (en) * 1971-07-28 1973-03-09 Advanced Prod Pty
GB1528120A (en) * 1975-10-21 1978-10-11 Thorogood A Non-drip flow valve
US4140148A (en) * 1976-11-18 1979-02-20 The Coca-Cola Company Pressure relief valve for product containers
DE3901032C1 (en) * 1989-01-14 1990-02-08 Danfoss A/S, Nordborg, Dk
EP0547863A1 (en) * 1991-12-16 1993-06-23 Seetru Limited Improvements in safety valves with flat elastomeric seals
US5919033A (en) * 1995-11-02 1999-07-06 Standex International Corporation Pump having relief valve seat free of direct structural restraint
DE102005027429A1 (en) * 2005-03-17 2006-09-21 Pacific Industrial Co., Ltd., Ogaki Valve and method of manufacturing the valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147739A5 (en) * 1971-07-28 1973-03-09 Advanced Prod Pty
GB1528120A (en) * 1975-10-21 1978-10-11 Thorogood A Non-drip flow valve
US4140148A (en) * 1976-11-18 1979-02-20 The Coca-Cola Company Pressure relief valve for product containers
DE3901032C1 (en) * 1989-01-14 1990-02-08 Danfoss A/S, Nordborg, Dk
EP0547863A1 (en) * 1991-12-16 1993-06-23 Seetru Limited Improvements in safety valves with flat elastomeric seals
US5919033A (en) * 1995-11-02 1999-07-06 Standex International Corporation Pump having relief valve seat free of direct structural restraint
DE102005027429A1 (en) * 2005-03-17 2006-09-21 Pacific Industrial Co., Ltd., Ogaki Valve and method of manufacturing the valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024016041A1 (en) 2022-07-21 2024-01-25 Ventrex Automotive Gmbh Pressure-relief valve for releasing an excess pressure of a gas in a controlled manner

Also Published As

Publication number Publication date
FR2913745A1 (en) 2008-09-19

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