Patent ID: 8307840

Claim:
A valve device for use with a fuel tank, comprising: a main body portion having a ventilation opening communicating with a connecting passage to an outside of the fuel tank; a valve body opening and closing the ventilation opening according to a liquid surface of a fuel in the fuel tank, said valve body having a shape with a closed upper end and an open lower end, and a suspending shaft extending upwardly from the closed upper end so that the valve body is slidably suspended in a vertical direction by the suspending shaft; and a skirt portion extending down from the main body portion so as to surround the valve body with a space relative to the valve body, so that when the valve body is located at a lower position, a gas inside the fuel tank passes through the ventilation opening and the space between the skirt portion and the valve body, and when the liquid surface of the fuel reaches the cuff portion of the skirt portion, the fuel is taken into the skirt portion due to a pressure difference between inside and outside of the fuel tank and the ventilation opening is closed by the valve body raised by the fuel taken into the skirt portion.