| 主权项 |
1. A valve device for a fuel tank, adapted to be attached to a fuel tank, comprising:
a case including a vent valve port communicating with an outside of the fuel tank at an upper portion, and including an inflow portion for a fuel below the vent valve port; and a float body which is located inside the case and rises by the fuel flowing into the case so as to be seated in the vent valve port, wherein in a face portion facing a bottom portion of the float body in the case, an elastic piece is formed by a first arc-shaped split groove formed such that a center of the face portion becomes a curvature inner side, and a second arc-shaped split groove formed outside the first arc-shaped split groove such that the center of the face portion becomes a curvature inner side, the elastic piece has an arc-shape in which the center of the face portion becomes a curvature inner side, one portion of the elastic piece abuts against the bottom portion of the float body, the elastic piece is disposed in the face portion between the first arc-shaped split groove and the second arc-shaped split groove, the first arc-shaped split groove, the second arc-shaped split groove, and the elastic piece have an arc-shape curving around a center axis of the case, and the face portion further comprises a communicating portion communicating the first and second arc-shaped split grooves, the communicating portion comprising a first groove extending radially outwardly from one groove end of the first arc-shaped split groove, and extending beyond the second arc-shaped split groove; a second groove extending radially outwardly from one groove end of the second arc-shaped split groove; and a third groove extending perpendicular to the first and second grooves to communicate the first and second grooves. |
