Patent ID: 7114697
Filing Date: 2006-10-03
Classification: E21B

Abstract:
1. A quick-acting valve actuator comprising: an actuator body; and a valve actuator member movable in the actuator body between a valve closed position and a valve open position; the actuator further comprising: a drive device in the actuator body; a driven member driven by the drive device relative to the actuator body, the drive device being suitable for causing the driven member to pass via a first stroke to a first trigger position; prestress means for prestressing the actuator member relative to the driven member in order to exert a repulsion force thereagainst when the driven member passes along its first stroke to its first trigger position, said force tending to cause the actuator member at least to pass from a first determined position selected from the valve-open and valve-closed positions to the second determined position selected from the valve-open and valve-closed positions; and locking-and-trigger means stationary relative to the actuator body and co-operating with the driven member and the actuator member so that: