Safety device for cutting off gas pipelines

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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F16K 17/38 (2006.01)

Patent

CA 2337410

The invention relates to a thermal security device for cutting off gas pipelines, wherein gas transfer is prevented by said safety device when temperature increases in the section of the gas pipeline placed downstream from said security device, especially when connected gas apparatuses are in a closed position. The aim of the invention is to maintain production costs and dimensions at a level as low as possible. The inventive device comprises a check valve (2) which prevents back flow from the gas pipeline which is placed downstream from said device. The inventive device also comprises a pressure sensitive element (3) which is actuated by the pressure in the pipeline placed downstream from said safety device. Said pressure sensitive element (3) is coupled to a cut-off valve (1) in such a way that when pressure increases in the downstream pipeline said valve (1) prevents gas from flowing into the pipeline. The inventive safety device is used to cut off automatically gas pipelines when temperature increases in an unacceptable way in the section of the pipeline which is placed downstream from said safety device.

L'invention vise à créer un dispositif de sécurité thermique pour fermer des canalisations transportant du gaz, dans lequel le passage de gaz est empêché par le dispositif de sécurité lors d'une élévation de température dans la zone de la canalisation transportant du gaz placée en aval du dispositif de sécurité, notamment en position fermée des appareils à gaz raccordés. En outre, les frais de fabrication et les dimensions doivent être maintenus à un niveau aussi faible que possible. Ce dispositif de sécurité comporte un clapet antiretour qui empêche un écoulement de retour en provenance de la canalisation transportant du gaz placée en aval de ce dispositif. Par ailleurs, un élément sensible à la pression actionné par la pression régnant dans la canalisation placée en aval est situé dans ce dispositif de sécurité. Cet élément sensible à la pression est accouplé avec une soupape de fermeture de telle manière que lors d'une augmentation de la pression dans la canalisation placée en aval, ladite soupape empêche un écoulement de gaz dans cette dernière. Le dispositif de sécurité sert à fermer automatiquement les canalisations de gaz lors de l'apparition d'une augmentation de température inadmissible dans la zone de la canalisation placée en aval du dispositif de sécurité.

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