A valve designed to close automatically when subjected to intense heat.
Typically, a fire valve is equipped with a fusible link. Under normal conditions, this link holds a spring-loaded poppet in the open position, allowing fuel to flow, unimpeded, through the valve. A fire at the site, however, would cause the fusible link to melt. This, in turn, would cause the spring loaded poppet to pop into the closed position, automatically cutting off the flow of gasoline or other fuel.