Fluid detection and shutoff actuation apparatus retrofitable on fluid shutoff valve

摘要

A fluid detection and shutoff actuation apparatus includes a rotatable plate mountable over a shaft of a shutoff valve, a linear actuator spaced from the plate, a trigger disposed between the actuator and plate, a fluid detector, and a control mechanism connecting the fluid detector to the actuator for activating it in response to detection of a fluid at a location monitored by the detector. The actuator is movable between extended and retracted positions toward and away from the plate. The plate rotates with the shaft between first and second positions in which the shutoff valve is respectively in opened and closed conditions and the plate is biased by a coil spring to rotate from the first to second position and change the valve from the opened to closed condition. The trigger is connected to the actuator and is pivotally movable toward and away from the plate in respond to movement of the actuator between the extended and retracted positions. As the actuator is moved toward and away from the trigger between the extended and retracted positions and the trigger therewith is pivotally moved toward and away from the plate, the plate correspondingly is prevented from rotating and thereby retains the value in the opened condition and is allowed to rotate such that the valve is changed from the opened to closed condition.