Patent ID: 8439068

Claim:
A fluid-flow control valve comprising: an inlet (E) for connecting to a feed duct; an outlet (S) for connecting to an evacuation duct; a valve member ( 1 ) that, at rest, bears against a valve seat ( 2 ) in such a manner as to isolate the inlet (E) from the outlet (S); and an actuator means ( 5 , C) for moving the valve member ( 1 ), the actuator means comprising: a chamber (C) that communicates with the inlet (E) via a hole ( 11 ) of determined section, the chamber (C) being disposed relative to the valve member ( 1 ) on its side facing away from the valve seat ( 2 ), in such a manner as to urge the valve member against its seat; a bypass ( 5 ) that connects the chamber (C) to the outlet (S), the bypass being controllable between an open state for passing fluid, and a closed state, the bypass presents a through section that is greater than the through section of the hole ( 11 ), so as to cause the pressure in the chamber to drop on opening the bypass; and a fluid-leak detector means ( 4 , 5 , 6 ) that are suitable for detecting a leak downstream from the valve member.