| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas external blowoff preventive valve for automatically operating a gas leakage preventive valve by causing deformation or rupture in a specific position when a shock is applied to a pipeline by an earthquake or falling of a snow mass. SOLUTION: A thin part 13 is formed on a valve body 11. A valve 15 and a valve seat 14 are constituted on the upstream side of this thin part 13. A valve push rod 17 provided with a fin 16 for securing flow of gas is loaded on the downstream side. An intermediate rod 39 is interposed between the valve 15 and the push rod 17 when necessary.
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