Flow control valve

A flow control valve disposed in a passage connecting an interior of a fuel tank with outside, comprising:

• a passage-defining member including (i) a first passage portion that has a first passage having an outlet port and a seal portion formed at a rim of an opening of the outlet port, and (ii) a second passage portion that has a second passage inflected from the first passage;
• and
• a valve mechanism adapted to seat onto the seal portion, and to open and close in response to pressure applied to the outlet port;
• wherein the passage-defining member includes a mounting portion disposed to an outside of the seal portion for mounting the valve mechanism;
• the valve mechanism has (i) a valve body for opening and closing the outlet port, and (ii) a mounted portion formed at an outside peripheral end of the valve body and adapted for mounting to the mounting portion, the valve mechanism being configured to open and close the outlet port with the mounted portion as a fulcrum point;
• and
• the valve body includes a seat portion adapted to seat onto the seal portion, and an extension portion integrally formed with the seat portion and protruding towards an outflow side of the second passage from the seal portion.