Patent ID: 7198248

Claim:
A valve for gases, liquids or powdery material, comprising a diaphragm shutter element having a central part and a peripheral edge, which are mobile axially with respect to one another between a first relative end position and a second relative end position, which correspond, respectively, to the open condition and to the closed condition of the valve, or vice versa, and shape-memory actuator means for controlling the position of said central part and said peripheral edge with respect to one another wherein said shape-memory means are operatively interposed between the central part and the peripheral edge of the diaphragm and are arranged substantially parallel to the diaphragm wherein said shape-memory means comprise a first shape-memory wire and a second shape-memory wire, set on the two faces of the aforesaid diaphragm and connected in diametrically opposite areas of a second peripheral support so as to tend to modify the position of a first central support and said second peripheral support with respect to one another when they are activated.