Patent ID: 8763626

Claim:
A ventilation valve for a liquid tank comprising: a housing comprising a side wall provided with ventilation openings, a cover provided with a ventilation aperture which is optionally connected to a venting circuit of the tank, and a base pierced with at least one first drainage aperture; and a float capable of closing off the ventilation aperture, said float being able to slide vertically inside the housing depending on the level of liquid therein, said valve also comprising a drainage chamber located underneath the housing in which the float slides, said chamber also comprising at least one second drainage aperture that is not aligned with the first drainage aperture of the base of the housing, wherein the draining chamber is integrated into the base of the housing, the base being in a shape of a hollow disc, the base comprising a first circular plate and a second circular plate connected together by a vertical plate oriented along one of the diameters of the first and second circular plates.