Fail-safe closure system for remotely operable valve actuator

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

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F16K 31/12 (2006.01) E21B 34/10 (2006.01) F15B 20/00 (2006.01)

Patent

CA 2291052

A fail-safe closure system comprises two control valves (122, 124), a piston actuator (126), a solenoid (147) for operating the control valves and an accumulator module (150). Supply pressurized fluid is applied to an opening chamber of one or a plurality of process valve actuators while a flow path is opened to a vent from a closing chamber of the one or more actuators. Control valves are arranged so that if or when they fail, they fail in a position which allows the process valve actuators to be closed.

L'invention porte sur un système de fermeture à sécurité intégré qui comprend deux soupapes de commande (122, 124), un actionneur (126) de piston, un solénoïde (147) faisant fonctionner les soupapes de commande et un module (150) d'accumulateur. On applique un fluide sous pression provenant d'une source d'alimentation sur une chambre d'ouverture d'un ou de plusieurs actionneurs de soupapes, la voie d'écoulement donnant sur un évent depuis la chambre de fermeture d'un ou de plusieurs actionneurs. Les soupapes de commande sont disposées de sorte qu'en cas de panne, elles se trouvent dans une position qui permette la fermeture des actionneurs de soupapes.

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