| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To satisfy both specifications, i.e., prevention of valve-closing action caused by rising of an internal pressure of a tank due to temperature rising or the like of a fuel tank FT and prevention of excessive oil-feeding in a fuel shutting-off valve 10. <P>SOLUTION: The fuel shutting-off valve 10 includes: a first float mechanism 50 stored in a first valve chamber 30S of a casing 20; and a second float mechanism 80 stored in a second valve chamber 31S. At oil-feeding, when the fuel closes an introduction opening 38d, the second float mechanism 80 closes a second ventilation hole 33c and the first float mechanism 50 closes a connection passage 31b. When the fuel closes the introduction opening 38d at the time other than oil-feeding, since the inside of the fuel tank FT and the first and second valve chambers 30S, 31S are also communicated with the second ventilation hole 33c in addition to a first ventilation hole 32a, difference of the internal pressure of the tank and the pressure of the valve chamber does not become large, the valve-closing action of the first float mechanism 50 is not generated, and the fuel tank FT is not air-tightly closed. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
