Device for preventing overfilling of containers, in particular containers intended to contain liquefied gases

Device for preventing overfilling of containers intended to contain liquefied gases, comprising:

• a valve body in which a gas duct is defined,
• a closure means axially movable in said valve body away from and towards a valve seat in order to open and to shut off said gas duct,
• an actuator capable of exerting a thrust to urge said closure means away from said seat, said actuator comprising a float,
• wherein the actuator comprises:
• a cam mechanism for exerting said thrust in an ascending phase of said float until preimposed limit position, corresponding to a maximum filling level, is reached, and comprising a member linked to the valve body by means of a hinge, the member comprising a cam profile that can be associated with the closure means in order to exert said thrust;
• and
• a lever mechanism for exerting said thrust in at least a first part of a descending phase of said float, starting from said limit position, the lever mechanism comprising a fulcrum hinged to the member in a distal position with respect to the hinge.