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Fusible Link Valve

bean Member Posts: 34
What is a Fusible Link Valve? How does it operate?


  • Jamie Hall
    Jamie Hall Member Posts: 20,501
    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.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • STEVEusaPA
    STEVEusaPA Member Posts: 5,983
    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).