Opens gradually to admit outside air to
relieve a vacuum in a tank. Features iron,
or steel body; iron, steel,
or stainless steel seat; non-asbestos or TFE
disc; size 2" iron with NPT or 125FLG
connections, 2" steel and stainless steel
with 150 or 300 FLG; 4" through 12" iron
with 125FLG, 4" through 12" steel and
stainless steel with 150 or 300 FLG. Air
relief capacities to 14,280 CFM.
Photo: 4" Iron 200. Stainless steel stem and
non-asbestos disc assembly, Iron body with
seat and brass guide, and stainless steel
spring assembly shown separately.
