| 摘要 |
A gas injection valve designed for long-term storage of liquefied carbon dioxide, adapted to minimize the permeation of carbon gas through a seal ring even if used for a long time, thus solving the problems including an increase in injection concentration of the contents and a decrease in the number of times of spraying. Particularly, it is arranged that a seal ring (17) closely contacts the three surfaces of a seal ring holding groove (18) holding the seal ring (17), and the outer peripheral surface of a valve pin, whereby the gas permeation area of the seal ring (17) is reduced to a half or less of the conventional value. Further, the seal ring (17) is made of an elastic material whose carbon dioxide gas permeability is low, thereby greatly reducing the amount of gas permeation through the seal ring (17).
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