Patent ID: 7150445

Claim:
A control valve device comprising a valve body defining a fluid flow duct in which a shutter element is disposed that is turned by actuator means via a drive shaft, wherein the shutter element is a hollow body formed of a surrounding wall closed at a top portion that is connected to the drive shaft and open at a bottom portion that is larger in dimension than the top portion, the surrounding wall having a notch, the notch providing a sloping profile defining an opening that tapers progressively going away from the bottom portion of the surrounding wall, the notch being profiled so as to define a variable flow section in the duct as a function of the angular position of said shutter element between a closed position in which the bottom portion of the hollow body closes off the duct and an open position in which the bottom portion of the hollow body is fully retracted from the fluid flow duct so as to allow the fluid to flow freely in the duct.