A valve on top of the top drum of the boiler, used to vent air from drum on boiler startup, and opened when boiler is cooling down to prevent a vacuum in the drum.
« Back to Glossary IndexGarratt-Callahan Water Treatment Expertise Since 1904
Water Treatment Products
Eduardo Lopez · ·
A valve on top of the top drum of the boiler, used to vent air from drum on boiler startup, and opened when boiler is cooling down to prevent a vacuum in the drum.
« Back to Glossary IndexWorried about Legionella in your system? Get Help