Linear hydraulic stepping actuator with fast close capabilities

F - Mech Eng,Light,Heat,Weapons – 15 – B

Patent

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Details

F15B 15/20 (2006.01) E21B 33/035 (2006.01) E21B 34/02 (2006.01) E21B 34/04 (2006.01)

Patent

CA 2491825

The invention provides a choke system with hydraulic circuits which provide choke valve positioning that can be varied by the use of incremental steps. The incremental movement action in either the opening or closing direction is accomplished through the use of one of the two hydraulic slave cylinders which can either add or subtract a fixed volume of hydraulic fluid from the choke actuator. A series of check valves provides direction for flow in the hydraulic lines, locking of the choke actuator, and re-filling of the slave cylinders during operation. The system eliminates excessive lines or solenoid valves and avoids the need for mechanical locking mechanisms. Preferred embodiments include a "fast close" system which, instead of running through a series of steps to close the valve, provides valve control in a fast close line to move the choke actuator to the full closed position from anywhere in the travel over a shorter period of time than through normal stepping operation.

Cette invention offre un système de volet de départ doté de circuits hydrauliques permettant de changer le positionnement du volet de départ en utilisant des échelons. Le mouvement de déplacement graduel lors de l'ouverture ou de la fermeture est créé grâce à l'utilisation de deux cylindres récepteurs hydrauliques capables d'ajouter ou de soustraire un volume fixe de fluide hydraulique du vérin du volet de départ. Un ensemble de clapets de non-retour permettent de diriger l'écoulement du fluide dans les conduites , de fermer le vérin du volet de départ, et de remplir à nouveau les cylindres récepteurs au cours de l'opération. Le système permet d'éviter les conduites inutiles ou les électrovalves et élimine le besoin de verrouillage mécanique des mécanismes. Les applications à privilégier comprennent un système à fermeture rapide qui, au lieu de passer par différentes étapes pour fermer la valve, permet de commander celle-ci dans une conduite à fermeture rapide pour faire passer le vérin à la position entièrement fermée à partir de n'importe quelle position et ce, en un temps plus court qu'en utilisant le processus normal.

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