Patent ID: 6779779
Filing Date: 2004-08-24
Classification: F16K

Abstract:
A valve device comprising a valve body defining a fluid flow duct, said duct having an upstream portion and a downstream portion between which there is disposed a plug having a main flow opening, the plug being movable between a first position in which the main flow opening co-operates with the flow duct, and a second position in which the plug closes said duct; a single annular gasket defining a sealed limit and an internal space, and providing sealing between the duct and an outside wall of the plug; said plug further including at least one secondary flow arrangement offset relative to said main flow opening so that when said plug is in an intermediate position between the open and closed positions, only the secondary flow arrangement is present in the internal space of the gasket so that the fluid flows exclusively via the secondary flow arrangement on one side of the sealed limit defined by the gasket and via the main opening on the other side of said limit.