Valve device for fuel tank

A fuel tank valve device comprising:

• a housing in which a partition wall defines a lower valve chamber and an upper ventilation chamber and a first opening and a second opening are provided in the partition wall so as to establish a communication between the valve chamber and the ventilation chamber;
• a first float valve that is accommodated in the valve chamber so as to rise and fall and that closes the first opening when a fuel level in a fuel tank nearly reaches a set full fuel level;
• a second float valve that is accommodated in the valve chamber so as to rise and fall and that closes the second opening when the fuel level in the fuel tank rises abnormally;
• a recess portion in which the first opening of the housing is formed at a bottom portion thereof and which makes up part of the ventilation chamber;
• and
• a fuel vapor discharge port that is formed so as to communicate with the ventilation chamber,
• wherein the partition wall includes a shelf wall portion that extends from a circumferential edge of the second opening to reach an inner circumference of the recess portion,
• wherein a first groove portion is formed on the shelf wall portion so as to extend from the second opening to the recess portion,
• wherein a ceiling wall that makes up a ceiling of the ventilation chamber is disposed above the shelf wall portion via a gap,
• wherein the fuel vapor discharge port is formed on an inner circumference of the recess portion at a different circumferential position from a circumferential position of the first groove portion,
• wherein there is further provided a fuel vapor piping that communicates with the fuel vapor discharge port and which is connected to the housing at an acute angle relative to a path extending from the second opening to the first opening, and
• wherein a bypass flow path is provided in the housing so as to be opened in the shelf wall portion to thereby communicate with the gap at one end and to be opened in the inner circumference of the fuel vapor piping to thereby communicate with the fuel vapor piping at the other end thereof.