Device for regulating an air flow in a conduit having an integrated shape memory actuator, particularly for motor-vehicle air-conditioning systems

Apparatus comprising a plurality of Venetian blind slats (8, 9) controlled by an actuator rod (11) associated to one side (4) of a frame (2) supporting the pivoting slats (8, 9). The actuator rod (11) is controlled by a metallic alloy shape memory wire (15) associated to said rod (11), which is powered by electrical current causing the wire to heat and shorten thus moving the actuator rod (11) against the action of a return spring (14). The actuator system is completely integrated in the structure of the apparatus. The position of the actuator rod (11) is signalled by a sensor (22), preferably a potentiometer, comprising a slider connected to the actuator rod (11), co-operating with an electrical track connected to the frame of the apparatus.