Vacuum-relief valve for the floating roofs of tanks for...

B - Operations – Transporting – 65 – D

Patent

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B65D 90/34 (2006.01)

Patent

CA 2285958

The present invention relates to a device which is used in the floating roofs of tanks for storing liquids and is intended to prevent the formation of a vacuum between the stored liquid and the floating roof (5). More particularly, the device of the invention is intended for a liquid storage tank which has operating heights which are much lower than the maintenance height. There are two possible ways in which the device of the invention can operate. When the floating roof (5) is in operating mode and reaches its minimum operating height (Figure 2), a lower shaft stop (10) of a sliding shaft of the valve comes against a lower stop (8) of the body (2) of the device, causing the device (30) to open. When the floating roof (5) is placed in the maintenance mode, use is made of a locking pin (4) for rigidly fastening the sliding shaft (3) to the body (2) of the device (30), which enables the assembly to open when the floating roof reaches the maintenance height.

La présente invention concerne un dispositif qui est utilisé dans les réservoirs à toit flottant de stockage de liquides. Le but de l'invention est d'empêcher la formation d'une dépression entre le liquide stocké et le toit flottant (5). L'invention concerne plus particulièrement un dispositif réservoir de stockage de liquides, dispositif dont les hauteurs de fonctionnement sont bien inférieures à la hauteur d'entretien. Il existe deux modes de fonctionnement possibles du dispositif selon l'invention. Lorsque le toit flottant (5) est en mode de fonctionnement et qu'il atteint sa hauteur de fonctionnement minimale (fig. 2), un dispositif d'arrêt inférieur de l'arbre (10) d'un arbre coulissant de la soupape vient buter contre un dispositif d'arrêt inférieur (8) du corps (2) du dispositif, ce qui entraîne l'ouverture du dispositif (30). Lorsque le toit flottant (5) est placé en mode entretien, on utilise une goupille d'arrêt (4) pour fixer de manière rigide l'arbre coulissant (3) du corps (2) du dispositif (30), ce qui permet à l'ensemble de s'ouvrir lorsque le toit flottant atteint la hauteur d'entretien.

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