Patent ID: 6962165

Claim:
Safety device inserted into a fluid pipeline (K) having a set minimal sectional area, said device protecting said pipeline against excessive flow rates of fluid circulating in said pipeline from upstream (X−) to downstream (X+), said device comprising: (a) a tube ( 1 ) with open upstream and downstream ends ( 10 , 11 ) and providing a central circulatory passage (CC) for the fluid; (b) a retention device ( 2 ) to hold the tube ( 1 ) in place within the pipeline (K), and (c) a fluid circulation regulator comprising: (1) a central valve having: (i) a valve seat ( 30 ) embedded in the tube ( 1 ); (ii) a central valve closure member ( 31 ) selectively applied to the valve seat ( 30 ); and (iii) a spring ( 32 ) exerting on the central valve closure member ( 31 ) an elastic opening force which opens the central valve closure member a distance from the valve seat ( 30 ), counter to a closure force exerted on the central valve closure member ( 31 ) by loss of head which increases with a flow rate of fluid in the pipeline (K), (2) an annular valve closure member ( 4 ) which is elastically malleable, mounted to an external periphery of the tube ( 1 ), and separated radially from the pipeline (K), in a rest configuration of the device, by an annulus (EA) providing the fluid with a peripheral circulatory passage (CP), said annular valve closure member ( 4 ) being subject to, in the event of excessive flow rate of the fluid, a radial expansion by which it is pressed against the pipeline (K) and obstructs the peripheral circulatory passage (CP); wherein said device changes between the rest configuration, which the device adopts in the event of a normal fluid flow rate and in which the central valve ( 3 ) frees the central circulatory passage (CC), and a safety configuration, which the device adopts in the event of an excessive fluid flow rate and in which the central valve ( 3 ) obstructs the central circulatory passage (cc).