Fire-protection valve with shutting spring for automatically...

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

Patent

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Details

F16K 17/38 (2006.01) A62C 4/02 (2006.01)

Patent

CA 2120025

A fire-protection valve is disclosed with a shutting spring, for automatically shutting off conduits, in particular gas conduits, such as those that are mounted upstream of gas fittings. The valve according to the invention comprises a metallic closure body having a spherical shape, at least in the sealing area. Its diameter forms a slight tight fit with the diameter of the first bore shaped in the housing of the valve, when the valve is closed. A second bore that extends in the axial direction of the first bore is arranged upstream thereof, in the direction of the closure body. The diameter of the second bore forms a loose fit with the diameter of the closure body. A spherical guide that tapers in the direction of the closure body in its open position is located between the closure of the second bore. The closure body is normally seated on three fixed points, one of which is a temperature-sensitive element. When the temperature of the element rises above a pre-determined level, the element becomes deformed and the closure spring forces the closure body through the opening between the fixed points, enlarged due to this deformation. The moving closure body is centered on the valve axis by the spherical guide and the second bore and, due to its kinetic energy, is pressed into the first bore, producing a tight moulding fit. After getting in touch with the housing, the closure body rapidly acquires its temperature, whereby the moulding fit increases resulting in a gas-tight connection which no longer requires the closure spring to keep the valve closed, even under shocks or concussions.

Cette invention concerne un clapet de protection incendie comportant un ressort de fermeture et destiné à fermer automatiquement une canalisation, en particulier une canalisation de gaz, en amont des installations au gaz. Le clapet selon l'invention comprend un obturateur métallique sphérique au moins du côté du siège de clapet. Le diamètre de l'obturateur est calculé pour réaliser un ajustement légèrement serré dans le premier alésage du corps de clapet, lorsque celui-ci est fermé. Un second alésage est ménagé en amont du premier alésage, dans son prolongement axial en direction de l'obturateur. Le diamètre du second alésage est supérieur à celui de l'obturateur, d'où un ajustement libre de celui-ci. Un guide sphérique qui s'élargit vers l'obturateur soulevé en position ouverte est prévu entre l'obturateur et le second alésage. L'obturateur est normalement appuyé contre trois points fixes, dont un est élément thermosensible. Lorsque la température de cet élément dépasse une valeur de consigne, il se produit une déformation de celui-ci et le ressort de fermeture pousse l'obturateur à travers l'ouverture qui existe entre les points fixes et qui s'élargit du fait de la déformation d'un des points. Le guide sphérique et le second alésage maintiennent l'obturateur centré sur l'axe du clapet et l'obturateur se cale à force dans le premier alésage, en raison de son énergie cinétique. Une fois en contact avec le corps du clapet, l'obturateur atteint rapidement la température de celui-ci, ce qui a pour effet de consolider le joint au point de rendre la fermeture parfaitement étanche sans assistance aucune du ressort de fermeture, même lorsque le clapet reçoit des coups ou l'onde de choc d'une déflagration.

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