Patent ID: 8261768

Claim:
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.