Blow Off Valves

Blow Off Valves

This valve is located in the bustle pipe of a blast furnace to blow off counter-flow gas to the atmosphere from the blast furnace when the furnace is at a stop.

The body and the disc are both made of cast steel for high temperature and constructed so as to be water-cooled, because the blast furnace gas of a high temperature flows through the valve.
The body is refractory-lined in its upsteam side interior to protect it from a high temperature.