FR2517790A1 - Process gas valve esp. of uranium isotope separator - with sealed operating arrangement providing back-up for bellows seal - Google Patents
Process gas valve esp. of uranium isotope separator - with sealed operating arrangement providing back-up for bellows seal Download PDFInfo
- Publication number
- FR2517790A1 FR2517790A1 FR8122875A FR8122875A FR2517790A1 FR 2517790 A1 FR2517790 A1 FR 2517790A1 FR 8122875 A FR8122875 A FR 8122875A FR 8122875 A FR8122875 A FR 8122875A FR 2517790 A1 FR2517790 A1 FR 2517790A1
- Authority
- FR
- France
- Prior art keywords
- valve
- bellows
- bore
- operating member
- shutter
- 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.)
- Granted
Links
- 229910052770 Uranium Inorganic materials 0.000 title abstract 2
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title abstract 2
- 238000007789 sealing Methods 0.000 claims description 15
- SANRKQGLYCLAFE-UHFFFAOYSA-H uranium hexafluoride Chemical compound F[U](F)(F)(F)(F)F SANRKQGLYCLAFE-UHFFFAOYSA-H 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
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
- F16K41/00—Spindle sealings
- F16K41/10—Spindle sealings with diaphragm, e.g. shaped as bellows or tube
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
Description
La présente invention concerne des valves. The present invention relates to valves.
L'invention se rapporte plus particulièrement, mais pas exclusivement, à une application dans laquelle sont utilisées des valves avec des fluides qui sont toxiques, radioactifs ou précieux, afin d'interdire sûrement une fuite dans l'atmosphère, ou bien lorsqu'il faut empêcher l1infil- tration de l'atmosphère ambiante ou autre fluide environnant pour éviter une réaction ou pour d'autres raisons. The invention relates more particularly, but not exclusively, to an application in which valves are used with fluids which are toxic, radioactive or precious, in order to surely prohibit a leak in the atmosphere, or else when necessary. prevent entry of the surrounding atmosphere or other surrounding fluid to prevent reaction or other reasons.
Les valves connues de ce genre, qui sont conçues pour interdire une fuite ou une infiltration, sont généralement équipées d'un soufflet destiné à assurer l'étanchéité entre un obturateur mobile longitudinalement et un corps fixe de la valve qui présente un siège avec lequel l'obturateur entre en contact pour fermer la valve. Un exemple d'une telle valve est décrit dans le brevet français No 1 438 495. Known valves of this kind, which are designed to prevent leakage or infiltration, are generally equipped with a bellows intended to seal between a shutter movable longitudinally and a fixed body of the valve which has a seat with which the the shutter comes into contact to close the valve. An example of such a valve is described in French patent No 1 438 495.
Un problème que posent de telles valves à levée réside dans le fait que, en cas de défaillance du soufflet, la valve serait sujette à une fuite. One problem with such lift valves is that if the bellows fails, the valve would be prone to leakage.
La présente invention a pour objet une valve à levée dans laquelle le problème ci-dessus est résolu. The present invention relates to a lift valve in which the above problem is solved.
Selon la présente invention, une valve à levée du type équipé d'un soufflet pour assurer l'étanchéité entre un obturateur mobile longitudinalement et un corps fixe qui présente un siège avec lequel l'obturateur vient en contact pour fermer la valve est caractérisée en ce qu'elle comporte
un élément de montage du soufflet auquel une extrémité dudit soufflet-est reliée d'une façon étanche, l'autre extrémité du soufflet étant fixée d'une façon étanche à l'obturateur ;;
deux parties séparées du corps entre lesquelles ledit élément de montage du soufflet est intercalé en présence d'éléments d'étanchéité
un organe de manoeuvre fixé a' l'obturateur et pouvant se déplacer longitudinalement dans un alésage ménagé dans l'une des parties du corps de la valve
des éléments d'étanchéité entre l'organe de manoeuvre et l'alésage, lesdits organes d'étanchéité pouvant être remplacés au cours de l'utilisation de la valve tout en conservant son intégrité ; et
un dispositif destiné à venir en prise avec l'organe de manoeuvre pour déplacer l'obturateur entre des positions "d'ouverture de la valve" et "de fermeture de la valve". Ainsi, l'invention concerne une valve dans laquelle, en cas de défaillance du soufflet, il existe néanmoins un contre-joint entre l'élément de manoeuvre -et son alésage.According to the present invention, a lift valve of the type fitted with a bellows for sealing between a longitudinally movable shutter and a fixed body which has a seat with which the shutter comes into contact to close the valve is characterized in that that it contains
a bellows mounting element to which one end of said bellows is connected in a sealed manner, the other end of the bellows being fixed in a sealed manner to the shutter;
two separate parts of the body between which said bellows mounting element is interposed in the presence of sealing elements
an operating member fixed to the shutter and able to move longitudinally in a bore formed in one of the parts of the valve body
sealing elements between the operating member and the bore, said sealing members being able to be replaced during use of the valve while retaining its integrity; and
a device intended to come into engagement with the operating member for moving the shutter between the "valve opening" and "valve closing" positions. Thus, the invention relates to a valve in which, in the event of failure of the bellows, there is nevertheless a counter-joint between the operating element and its bore.
En outre, ce contre-joint peut être remplacé en service de façon à pouvoir augmenter la longévité effective de la valve sans interrompre le fonctionnement d'une installation dans laquelle ladite valve est utilisée.In addition, this counter-seal can be replaced in service so as to be able to increase the effective life of the valve without interrupting the operation of an installation in which said valve is used.
De préférence, il est prévu entre le soufflet et les éléments d'étanchéité remplaçables un accès pouvant être fermé hermétiquement, de manière à pouvoir mettre sous vide un espace intermédiaire pour contrôler 17 intégrité du soufflet et/ou des éléments d'étanchéité remplaçables. Preferably, there is provided between the bellows and the replaceable sealing elements an access which can be hermetically sealed, so that an intermediate space can be evacuated to check the integrity of the bellows and / or the replaceable sealing elements.
Avantageusement, les bagues d'étanchéité rempla çables constituent deux joints toriques montés sur l'organe de manoeuvre pour venir au contact de l'alésage. Advantageously, the replaceable sealing rings constitute two O-rings mounted on the operating member to come into contact with the bore.
L'invention sera décrite plus en détail en regard des dessins annexés à titre d'exemples nullement limitatifs et sur lesquels
la figure 1 est une coupe d'une valve d'arrêt.The invention will be described in more detail with reference to the accompanying drawings by way of non-limiting examples and in which
Figure 1 is a section of a stop valve.
suivant la ligne I-I de la figure 3 ;
la figure 2 est une vue en bout de la valve
la figure 3 est une vue en plan ; et
la figure 4 est une coupe d'une seconde forme de réalisation de la valve.along line II of Figure 3;
Figure 2 is an end view of the valve
Figure 3 is a plan view; and
Figure 4 is a section of a second embodiment of the valve.
On va examiner tout d'abord les figures 1 à 3 sur lesquelles est représentée une partie 1 du corps de valve présentant un alésage d'entrée 2, un alésage de sortie 3 perpendiculaire à l'alésage 2 et un plus grand alésage 4 formant une chambre pour les organes internes de la valve. We will first examine Figures 1 to 3 in which is shown a part 1 of the valve body having an inlet bore 2, an outlet bore 3 perpendicular to the bore 2 and a larger bore 4 forming a chamber for the internal organs of the valve.
Des trous 5 de boulonnage sont ménagés dans la région inférieure de la partie 1 du corps afin de fixer la valve à l'installation. Des moyens (classiques) de fixation d'une canalisation à l'entrée et à la sortie sont également prévus (non représentés). Bolt holes 5 are provided in the lower region of part 1 of the body in order to fix the valve to the installation. Means (conventional) for fixing a pipe to the inlet and to the outlet are also provided (not shown).
La chambre formée par l'alésage 4 se termine par un épaulement 6 qui entoure l'alésage d'entrée 2 ; cet épaulement constitue un siège sur lequel un obturateur 7 peut prendre appui dans la position fermée de la valve. L'obturateur 7 consiste en un disque 8 à embout, à la face inférieure duquel une rondelle 9 (en "Nylon" ou polytétrafluoréthylène (PTFE) ou matière plastique analogue résistant à la corrosion) est fixée par un disque d'appui 10 assujetti au disque 8 par une virole déployée 11 faisant partie du disque 8. The chamber formed by the bore 4 ends in a shoulder 6 which surrounds the inlet bore 2; this shoulder constitutes a seat on which a shutter 7 can bear in the closed position of the valve. The shutter 7 consists of a disc 8 with a tip, on the underside of which a washer 9 (in "Nylon" or polytetrafluoroethylene (PTFE) or similar corrosion-resistant plastic) is fixed by a support disc 10 secured to the disc 8 by a deployed ferrule 11 forming part of disc 8.
L'embout du disque 8 présente un trou borgne taraudé 12 dans lequel est vissée l'extrémité filetée d'un organe de manoeuvre généralement cylindrique 13 logé dans un alésage cylindrique 14 ménagé dans un embout 15 de la seconde partie 16 du corps de la valve, deux joints toriques 17 étant logés dans des gorges correspondantes de l'organe 13. A la face supérieure du disque 8 est fixée d'une façon étanche l'extrémité inférieure d'un soufflet métallique 18, dont l'extrémité supérieure est fixée d'une façon étanche à un élément généralement rectangulaire 19 de montage dudit soufflet qui est intercalé entre la face extrême supérieure de la partie 1 du corps et la face extrême inférieure dtune partie 16 du corps, l'embout 15 de la partie 16 du corps traversant une ouverture de l'élément 19 et étant disposé à l'intérieur du soufflet 18.Une bague d'étanchéité 20 est logée dans une cavité correspondante de la partie 16 du corps et constitue un contre-joint qui renforce l'étanchéité assurée par le soufflet 18. Des vis à tête 22 fixent l'élément 19 à la partie 1 du corps et un joint 21 intercalé entre l'élément 19 et la partie 1 du corps, qui constitue un joint primaire comme le soufflet 18, se compose de deux bagues toriques logées dans une cavité correspondante ménagée dans la face extrême supérieure de la partie 1 du corps, un espace intermédiaire 21' étant ménagé entre les bagues toriques et communiquant avec un trou "reniflard" et un bouchon externe, comme le montre la figure 1, pour effectuer un contrôle initial du joint 21.La partie 16 du corps présente des cavités 22' pour loger les têtes des vis 22 et des vis à têtes 23 sont destinées à fixer la partie 16 à la partie 1 du corps en dehors de la périphérie de l'élément 19 (voir figure 3). The tip of the disc 8 has a tapped blind hole 12 into which is screwed the threaded end of a generally cylindrical actuating member 13 housed in a cylindrical bore 14 formed in a tip 15 of the second part 16 of the valve body , two O-rings 17 being housed in corresponding grooves of the member 13. To the upper face of the disc 8 is fixed in a sealed manner the lower end of a metal bellows 18, the upper end of which is fixed d in a sealed manner to a generally rectangular element 19 for mounting said bellows which is interposed between the upper end face of part 1 of the body and the lower end face of part 16 of the body, the end piece 15 of part 16 of the body passing through an opening of the element 19 and being disposed inside the bellows 18. A sealing ring 20 is housed in a corresponding cavity in the part 16 of the body and constitutes a counter-joint which reinforces the seal provided by the e bellows 18. Head screws 22 fix the element 19 to the part 1 of the body and a seal 21 interposed between the element 19 and the part 1 of the body, which constitutes a primary seal like the bellows 18, consists of two O-rings housed in a corresponding cavity formed in the upper end face of part 1 of the body, an intermediate space 21 'being formed between the O-rings and communicating with a "breather" hole and an external plug, as shown in the figure 1, to carry out an initial check of the seal 21. The part 16 of the body has cavities 22 'for housing the heads of the screws 22 and the head screws 23 are intended to fix the part 16 to the part 1 of the body outside of the periphery of the element 19 (see Figure 3).
Un espace intermédiaire 24 est constitué par un jeu annulaire entre l'élément 19 et la face extrême inférieure de la partie 16 du corps, ledit espace intermédiaire se terminant à peu de distance du joint annulaire 20, communique avec un trou "reniflard" 25 se terminant à l'extérieur de la partie -16 du corps et logeant un clapet 26 équipé d'un capuchon 27, au moyen desquels il est possible de "renifler" l'atmosphère présente dans l'espace intermédiaire 24 au moyen d'un équipement de contrôle portable approprié (non représenté) et ainsi, il est possible de vérifier l'efficacité de 11 étanchéité assurée par le soufflet 18, le joint 20, le joint 21 et les bagues toriques 17.An intermediate space 24 is formed by an annular clearance between the element 19 and the lower end face of the part 16 of the body, said intermediate space ending at a short distance from the annular seal 20, communicates with a "breather" hole 25 ending outside the part -16 of the body and housing a valve 26 equipped with a cap 27, by means of which it is possible to "sniff" the atmosphere present in the intermediate space 24 by means of equipment appropriate portable control device (not shown) and thus, it is possible to verify the effectiveness of the seal provided by the bellows 18, the seal 20, the seal 21 and the O-rings 17.
L'organe de manoeuvre 13 présente à son extrémité supérieure'un filetage, ainsi qu'un méplat 28 ménagé longitudinalement sur une distance dépassant légèrement la longueur de son filetage. Un goujon 29 entouré d'un ressort, qui traverse l'alésage 14 de la partie 16 du corps, est en contact avec le méplat 28 et empêche l'organe 13 de tourner tout en lui permettant de se déplacer longitudinalement. The actuator 13 has at its upper end a thread, as well as a flat 28 formed longitudinally over a distance slightly exceeding the length of its thread. A stud 29 surrounded by a spring, which passes through the bore 14 of the part 16 of the body, is in contact with the flat 28 and prevents the member 13 from rotating while allowing it to move longitudinally.
Une rondelle 30 maintient le goujon 29 en position et un élément rotatif 31 de manoeuvre de la valve est maintenu à l'en- contre d'un mouvement longitudinal, tout en étant en prise par filetage avec l'extrémité supérieure de l'élément 13, par un manchon bridé 32 fixé à la partie 16 par des boulons 33.A washer 30 holds the stud 29 in position and a rotary member 31 for operating the valve is held against a longitudinal movement, while being threaded with the upper end of the member 13 , by a flanged sleeve 32 fixed to the part 16 by bolts 33.
L'élément 31 présente extérieurement la forme d'un écrou (voir figure 3) pour venir en prise avec un outil (non representé) de manoeuvre de la valve, qui est enfilé sur une partie supérieure cylindrique 34 de plus petite dimension de l'élément 13, constituant un pivot pour l'outil.The element 31 externally has the shape of a nut (see FIG. 3) for engaging with a tool (not shown) for operating the valve, which is threaded on a cylindrical upper part 34 of smaller dimension of the element 13, constituting a pivot for the tool.
L'extrémité inférieure de l'embout 15 de la partie 16 du corps présente une petite saillie annulaire 35 destinée à venir au contact de l'extrémité supérieure de l'embout du disque 8 constituant une partie de l'obturateur 7. The lower end of the end-piece 15 of the part 16 of the body has a small annular projection 35 intended to come into contact with the upper end of the end-piece of the disc 8 constituting a part of the shutter 7.
Ce contact se produit lorsque l'organe de manoeuvre 13 est tiré aussi loin que possible par la rotation de l'élément 31 et sert à former un autre contre-joint pour le soufflet 18 en plus du fait de compléter l'action des bagues toriques 17 dans la position ouverte de la valve.This contact occurs when the operating member 13 is pulled as far as possible by the rotation of the element 31 and serves to form another counter-joint for the bellows 18 in addition to completing the action of the O-rings. 17 in the open position of the valve.
D'autres contre-joints sont constitués par le joint annulaire 20 et les bagues toriques 17. Ces dernières et le joint annulaire 20 peuvent être remplacés pendant que la valve est en service, en enlevant la partie 16 du corps tout en laissant l'élément de montage 19 à l'état assujetti à la partie 1 du corps par les vis 22. Other counter-seals are constituted by the annular seal 20 and the O-rings 17. These and the annular seal 20 can be replaced while the valve is in service, by removing the part 16 of the body while leaving the element mounting 19 in the state subject to part 1 of the body by the screws 22.
On va examiner maintenant la figure 4 qui illustre une seconde forme de réalisation de la valve qui peut être commandée à distance. Sur la figure 4, les mêmes pièces sont désignées par les mêmes numéros de référence que sur les figures 1, 2 et 3. Sur la figure 4, l'organe ou la broche 13 est déplacé vers le bas et vers le haut pour fermer et ouvrir la valve sous l'action d'une pression pneumatique et de ressorts, respectivement. L'ouverture et la fermeture de la valve sont indiquées par la manoeuvre d'interrupteurslimiteurs 36 actionnés par une tige 37 qui est reliée à la broche 13. Un ressort hélicoidal 38 soumet la broche 13 à une force élastique, comme on l'expliquera plus loin. We will now examine Figure 4 which illustrates a second embodiment of the valve which can be controlled remotely. In FIG. 4, the same parts are designated by the same reference numbers as in FIGS. 1, 2 and 3. In FIG. 4, the member or the pin 13 is moved down and up to close and open the valve by pneumatic pressure and springs, respectively. The opening and closing of the valve are indicated by the operation of limit switches 36 actuated by a rod 37 which is connected to the pin 13. A helical spring 38 subjects the pin 13 to an elastic force, as will be explained more far.
Le corps 1 est fixé par des boulons 22 à un vérin de manoeuvre 33 par l'intermédiaire de l'élément 19 de montage du soufflet. Sur la figure 4, des joints disposés entre le corps 1 et l'élément 19 et entre ce dernier et le vérin 43 sont désignés par 20 et 20'. Le vérin 43 présente un couvercle 45 fixé par des boulons, dont un est désigné par 46, et une garniture 47 est intercalée entre le couvercle 45 et le cylindre du vérin 43. Un boîtier 48 contenant les interrupteurs-limiteurs est vissé sur le couvercle 45 par des vis de fixation 49. The body 1 is fixed by bolts 22 to an actuating cylinder 33 by means of the element 19 for mounting the bellows. In FIG. 4, seals arranged between the body 1 and the element 19 and between the latter and the jack 43 are designated by 20 and 20 ′. The jack 43 has a cover 45 fixed by bolts, one of which is designated by 46, and a lining 47 is interposed between the cover 45 and the cylinder of the jack 43. A housing 48 containing the limit switches is screwed on the cover 45 by fixing screws 49.
Le vérin 43 présente un orifice 50 auquel peut être raccordée une source d'air (non représentée) ou qui peut constituer un orifice d'échappement. Un orifice analogue 51 est ménagé au-dessous de l'orifice 50 dans le cy-lindre du vérin et joue un rôle analogue. Un seul de ces orifices constitue l'orifice d'échappement à un moment considéré. Toutefois, un piston 52 est fixé à la broche 43 par une bague élastique 53 et une rondelle 54. L'étanchéité entre la broche et le piston est assurée par une bague torique 55. Des bagues toriques 56 et 57 assurent l'étanchéité au fluide entre le piston 52 et le cylindre du vérin 43. Les ressorts 38 sont placés dans des compartiments cylindriques 58 et 59 et reposent sur un siège inférieur 63. The jack 43 has an orifice 50 to which an air source (not shown) can be connected or which can constitute an exhaust orifice. A similar orifice 51 is formed below the orifice 50 in the cylinder of the cylinder and plays a similar role. Only one of these orifices constitutes the exhaust orifice at a given time. However, a piston 52 is fixed to the spindle 43 by an elastic ring 53 and a washer 54. The seal between the spindle and the piston is ensured by an O-ring 55. O-rings 56 and 57 ensure the fluid-tightness between the piston 52 and the cylinder of the jack 43. The springs 38 are placed in cylindrical compartments 58 and 59 and rest on a lower seat 63.
Dans le cas de la valve représentée sur la figure 4, la position de sécurité en cas de défaillance pneumatique est la position ouverte de la valve sous l'action des ressorts et, dans la variante, la position-de sécurité en cas de défaillance serait la position fermée. En conséquence, la valve du premier type pourrait être utilisée dans un système d'échappement et celle du second type dans un système d'admission. In the case of the valve represented in FIG. 4, the safety position in the event of pneumatic failure is the open position of the valve under the action of the springs and, in the variant, the safety position in the event of failure would be the closed position. Consequently, the valve of the first type could be used in an exhaust system and that of the second type in an intake system.
I1 ressort donc de la description ci-dessus que la présente invention concerne une valve à levée perfectionnée. I1 therefore emerges from the above description that the present invention relates to an improved lift valve.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8122875A FR2517790A1 (en) | 1981-12-07 | 1981-12-07 | Process gas valve esp. of uranium isotope separator - with sealed operating arrangement providing back-up for bellows seal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8122875A FR2517790A1 (en) | 1981-12-07 | 1981-12-07 | Process gas valve esp. of uranium isotope separator - with sealed operating arrangement providing back-up for bellows seal |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2517790A1 true FR2517790A1 (en) | 1983-06-10 |
FR2517790B1 FR2517790B1 (en) | 1984-04-20 |
Family
ID=9264755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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FR8122875A Granted FR2517790A1 (en) | 1981-12-07 | 1981-12-07 | Process gas valve esp. of uranium isotope separator - with sealed operating arrangement providing back-up for bellows seal |
Country Status (1)
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FR (1) | FR2517790A1 (en) |
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