Ventilation device for a fuel tank with a security feature against excessive filling

摘要

The invention relates to a ventilation device according to one of claims 1 to 4 of the main patent, in which the shut-off valve 4 comprises a flap 15 returned against a seat by a spring 6 and comprising a pusher 5 subjected to the action of the filling nozzle. The device according to the invention is characterised in that a cage 16 equipped with a seal 17 interacting with a seat 21 of the ventilation pipe 3 is mounted so as to slide on the said flap 15 and contains a ball 18 lodged by gravity on inclined planes 20 of the said flap 15. Application to the automotive industry. <IMAGE>