Pulsed mass spectrometer leak valve with controlled energy...

H - Electricity – 01 – J

Patent

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H01J 49/04 (2006.01) F16K 31/06 (2006.01)

Patent

CA 2346030

The closure of a leak valve in a pulsed mass spectrometer is controlled to thereby substantially extend the life of the valve. An actuator responds to a pulse to open the valve. At the end of the open period the element that closes the valve seat is allowed to travel a substantial distance from the open position of the element to the nearly closed position of the element. The pulse amplitude is then controlled so that the time for the element to travel the remaining distance to valve seat closure is extended in time. The pulse amplitude can also be controlled so that the valve will never close except under fault conditions where power is lost or in a non-operating mode.

La fermeture d'une vanne de fuite dans un spectromètre de masse pulsé est régulée, ce qui prolonge considérablement la durée de vie de ladite vanne. Un actionneur répond à une impulsion pour ouvrir la vanne. A la fin de la période d'ouverture, l'élément qui ferme le siège de vanne est amené à se déplacer sur une distance considérable, de la position ouverte de l'élément à la position presque fermée dudit élément. L'amplitude d'impulsion est ensuite régulée si bien que la durée nécessaire à l'élément pour parcourir la distance restante jusqu'à la fermeture du siège de vanne est prolongée. L'amplitude des impulsions peut également être régulée de manière telle que la vanne ne sera fermera jamais, sauf dans des conditions de défaillance dans lesquelles de la puissance est perdue ou dans un mode de non-fonctionnement.

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