| 摘要 |
PROBLEM TO BE SOLVED: To provide a fusible plug used for a vacuum hot water boiler, performing safe function in pressure rise accompanied with temperature rise as well as pressure rise not accompanied with temperature rise. SOLUTION: The fusible plug having a plug body held and fixed via an easy-to-melt alloy molding with a push-in bolt comprises using a compression spring, instead of the push-in bolt, for mounting and fixation.
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