Automatically-actuated safety device with a double-seated valve to regulate the flow rate of a fluid

摘要

A safety device for insertion into a pipeline (K) in which fluid circulates in an upstream (X-) and a downstream (X+) direction, comprises a tube ( 1 ) that provides the fluid with a central circulatory passage (CC) regulated by a central valve ( 3 ) that closes in the event of an excessive flow of this fluid. There is an annular valve closure member ( 4 ) which is elastically malleable, mounted to the external periphery of the tube ( 1 ), and provides the fluid with a peripheral circulatory passage which it selectively obstructs by subjecting a radial expansion in the event of an excessive flow of fluid.