Proportional valve, particularly for fluid dispensing devices, comprising a main body in which an inlet conduit for an inlet fluid entering said proportional valve and an outlet conduit for a fluid leaving said proportional valve are defined, said inlet conduit and said outlet conduit being in fluid communication with each other, said proportional valve comprising at least one shutter element arranged between said inlet conduit and said outlet conduit adapted to intercept said fluid, said shutter element comprising a movable fluid sealing element adapted to intercept said fluid at one of said inlet conduit and said outlet conduit and a lever element associated at a first end with said movable fluid sealing element and at a second end with an actuator device, said lever element being hinged about said main body at a fulcrum point arranged between said first end and said second end of said lever element, said actuator device being configured for moving said lever element of said shutter element around said fulcrum point so as to move said movable fluid sealing element between an opening position in which the fluid communication between said inlet conduit and said outlet conduit is allowed and a closing position in which the fluid communication between said inlet conduit and said outlet conduit is prevented, characterized by the fact that said actuator device comprises an actuator element made of a shape memory material which can be operated progressively to move said lever element of said shutter element around said fulcrum point so as to proportionally vary the degree of opening of said movable fluid sealing element between said opening position and said closing position, and vice versa, the variation of said degree of opening of said movable fluid sealing element allowing the regulation of the flow rate of said fluid exiting from said outlet conduit; said actuator device comprising an electric current generating device operatively connected to said actuator element in order to selectively modify the shape and/or the size of said actuator element through a temperature variation induced by the passage of electric current inside said actuator element; the proportional valve comprising an electronic control board configured to control said electric current generator device and a temperature sensor, in contact with the fluid, in data communication with the electronic board, the electronic control board being capable of regulating the flow rate of the fluid both on the basis of pre-set parameters and on the basis of values detected by the temperature sensor present in the proportional valve. said proportional valve comprising at least one shutter element arranged between said inlet conduit and said outlet conduit adapted to intercept said fluid, said shutter element comprising a movable fluid sealing element adapted to intercept said fluid at one of said inlet conduit and said outlet conduit and a lever element associated at a first end with said movable fluid sealing element and at a second end with an actuator device, said lever element being hinged about said main body at a fulcrum point arranged between said first end and said second end of said lever element, said actuator device being configured for moving said lever element of said shutter element around said fulcrum point so as to move said movable fluid sealing element between an opening position in which the fluid communication between said inlet conduit and said outlet conduit is allowed and a closing position in which the fluid communication between said inlet conduit and said outlet conduit is prevented, characterized by the fact that said actuator device comprises an actuator element made of a shape memory material which can be operated progressively to move said lever element of said shutter element around said fulcrum point so as to proportionally vary the degree of opening of said movable fluid sealing element between said opening position and said closing position, and vice versa, the variation of said degree of opening of said movable fluid sealing element allowing the regulation of the flow rate of said fluid exiting from said outlet conduit; said actuator device comprising an electric current generating device operatively connected to said actuator element in order to selectively modify the shape and/or the size of said actuator element through a temperature variation induced by the passage of electric current inside said actuator element; the proportional valve comprising an electronic control board configured to control said electric current generator device and a temperature sensor, in contact with the fluid, in data communication with the electronic board, the electronic control board being capable of regulating the flow rate of the fluid both on the basis of pre-set parameters and on the basis of values detected by the temperature sensor present in the proportional valve.