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Fusible Link Valve

beanbean Member Posts: 27
What is a Fusible Link Valve? How does it operate?


  • Jamie HallJamie Hall Member Posts: 9,383
    Any of a variety of valves, usually for oil but sometimes for gas which contains a fusible link and a spring. The fusible link is a low melting point alloy, chosen to melt at a certain temperature, depending on the application. The link is arranged -- in the variety I suspect you are enquiring about -- so that it holds a valve in the oil line open against the force of a spring. If the temperature gets too high, the link melts and the spring shuts the valve.

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • STEVEusaPASTEVEusaPA Member Posts: 2,441
    Which one specifically are you talking about? There is suppose to be one (typically called a firomatic) at the burner and one at the oil tank, for the oil lines, and there should be one above the heating appliance in series electrically with the main shut-off to the system (burner).
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