AVT125 series (Thermostatic Air Vents) are used on
steam applications up to 125 PSIG for removal of air and non-condensable
gases from process equipment, vessels and piping. The air vent contains
a welded stainless steel thermal element that expands when heated and
contracts when cooled. When air and non-condensable gases are present,
the valve is in the open discharge position. When steam reaches the air
vent, the element expands and closes the valve off tightly. The air vent
should be located at the highest paint in the system or vessel.