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 to establish a communication between the lower valve chamber and the upper ventilation chamber;
• a first float valve that is accommodated in a first valve chamber of the lower 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 a second valve chamber of the lower 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 of the recess portion and which makes up a part of the upper ventilation chamber;
• and
• a fuel vapor discharge port that is formed so as to communicate with the upper ventilation chamber,
• wherein the partition wall includes a shelf wall portion that extends to the recess portion,
• wherein a first groove portion is formed on the shelf wall portion so as to extend to the recess portion,
• wherein a ceiling wall that makes up a ceiling of the upper 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 an inner circumference of the fuel vapor piping to thereby communicate with the fuel vapor piping at an other end of the bypass flow path.

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 to establish a communication between the lower valve chamber and the upper ventilation chamber;
• a first float valve that is accommodated in a first valve chamber of the lower 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 a second valve chamber of the lower 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 of the recess portion and which makes up a part of the upper ventilation chamber;
• and
• a fuel vapor discharge port that is formed so as to communicate with the upper ventilation chamber,
• wherein the partition wall includes a shelf wall portion that extends to the recess portion,
• wherein a first groove portion is formed on the shelf wall portion so as to extend to the recess portion,
• wherein a ceiling wall that makes up a ceiling of the upper ventilation chamber is disposed above the shelf wall portion via a gap,
• wherein a third opening that makes up the fuel vapor discharge port is provided on the shelf wall portion at a position that lies spaced away from the recess portion when the housing is seen from thereabove,
• wherein a second groove portion is formed on the partition wall so as to extend to establish a communication between the recess portion and the third opening;
• wherein the housing includes a main body portion in which the lower valve chamber, the upper ventilation chamber, the partition wall, the recess portion, and the fuel vapor discharge port are provided, and
• wherein the ceiling wall as a separate me r is mounted on the main body portion.