Valve device for fuel tank

A valve device for fuel tank, comprising:

• a case having an air flow valve orifice communicated with outside of the tank at an upper part thereof, and a fuel inflow part below the air flow valve orifice, said case being divided into an upper chamber and a lower chamber by a partition formed between the air flow valve orifice and the inflow part;
• an upper float body disposed inside the upper chamber of the case, and ascending by fuel flowing into the case to be seated in said air flow valve orifice;
• and
• a lower float body having an upwardly projecting guide shaft, being supported inside the lower chamber of the case with the guide shaft being inserted to be movable vertically inside an insertion part formed on said partition, and ascending by the fuel flowing into the case to close a main connect-through part between the lower chamber and the upper chamber, formed on said partition,
• wherein said upper float body has a receiving hole to receive the guide shaft of the lower float body.