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单词 Fusible plug
释义

Fusible plug

英语百科

Fusible plug

A drawing of a fusible plug, showing the tapered core.
A modern fusible plug. The core of low melting-point metal is visible.
Fusible plug with a core

A fusible plug is a threaded metal cylinder usually of bronze, brass or gunmetal, with a tapered hole drilled completely through its length. This hole is sealed with a metal of low melting point that flows away if a pre-determined, high temperature is reached. The initial use of the fusible plug was as a safety precaution against low water levels in steam engine boilers, but later applications extended its use to other closed vessels, such as air conditioning systems and tanks for transporting corrosive or liquefied petroleum gasses.

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