NEW CAP WITH VALVE SYSTEM PROVIDED WITH FLOW REDUCER

A fluid vent valve (1) for a fuel tank, comprising: a valve body (10) having an inlet opening connected or connectable to a tank, an outlet opening and a main chamber (13) interposed between said inlet opening and said outlet opening (12); a piston (20) inserted or insertable in the main chamber (13) and movable therein so as to define a closed configuration and an open configuration; a pendulum (30) hinged to the valve body (10) and coupled to the piston (20) so as to promote a movement of the piston (20) between the two configurations; a flow reducer (40) operatively interposed between the outlet opening (12) and the piston (20).