| 摘要 |
<p>The structure of the present invention enhances the sealing property of a valve body 61 of a positive pressure valve 60 in a fuel tank cap 10, thus improving the pressure control ability. The positive pressure valve 60 controls the pressure in a fuel tank by opening and closing a rubber valve body 61. The valve body 61 is supported on a rear face 62a thereof by a valve support member 68, and is seated on and separated from a seat member 30. The valve body 61 has a ring recess 64 arranged in an outer circumferential portion thereof to form a thin-wall seating portion, which is seated on the seat member 30. The valve body 61 is seated on the seat member 30 not in the inclined attitude but in the horizontal attitude, while being supported by the valve support member 68 on both the inner circumferential side and the outer circumferential side of the ring recess 64. <IMAGE></p> |
