| 摘要 |
A fuel tank cap with enhanced sealing property of a valve body of a positive pressure valve, which improves the pressure control ability of the fuel tank cap is disclosed. The positive pressure valve controls the pressure in a fuel tank by opening and closing a rubber valve body. The valve body is supported on its rear face by a valve support member, and is seated on and separated from a seat member. The valve body has a ring recess arranged in an outer circumferential portion thereof to form a thin-wall seating portion, which is seated on the seat member. The valve body is seated horizontally on the seat member, and is supported by the valve support member on both the inner circumferential side and the outer circumferential side of the ring recess.
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