Shape memory alloy trigger for pressure relief valve

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

Patent

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Details

F16K 17/38 (2006.01) F16C 1/20 (2006.01) F16K 31/00 (2006.01) F17C 13/12 (2006.01)

Patent

CA 2753386

This disclosure describes an apparatus having a valve (24) and an elongated shape memory alloy element (28). The valve (24) has a lever (32) in a first position, whereby the valve (24) is closed. The elongated shape memory alloy element (28) has a first end (30) connected to the lever (32). The shape memory alloy element (28) has been strained to have a first length, wherein exposure of at least a portion of the shape memory alloy element (28) to a temperature at or exceeding its austenite transformation temperature causes the shape memory alloy element (28) to shorten to a second length, the second length being less than the first length, thereby causing the first end (30) of the shape memory alloy element (28) to pull the lever (32) to a second position, whereby the valve (24) is opened.

Cette invention porte sur un appareil ayant une soupape (24) et un élément allongé en alliage à mémoire de forme (28). La soupape (24) a un levier (32) dans une première position de sorte que la soupape (24) est fermée. L'élément allongé en alliage à mémoire de forme (28) a une première extrémité (30) raccordée au levier (32). L'élément en alliage à mémoire de forme (28) a été déformé pour avoir une première longueur, l'exposition d'au moins une partie de l'élément en alliage à mémoire de forme (28) à la température de transformation austénitique ou à une température supérieure à sa température de transformation austénitique provoquant le raccourcissement de l'élément en alliage à mémoire de forme (28) à une seconde longueur, la seconde longueur étant plus courte que la première longueur, amenant ainsi la première extrémité (30) de l'élément en alliage à mémoire de forme (28) à tirer le levier (32) vers une seconde position de sorte à ouvrir la soupape (24).

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