Armstrong AVA and AVV automatic air vents continuously remove air that can accumulate in a Hydronic system. Effective air elimination helps to reduce system operating noise caused by entrained air in the hydronic fluid and also helps to extend system component life by reducing the risk of corrosion or cavitation. AVA and AVV automatic air vents may be used on their own, or with Armstrong air removal traps for maximum air elimination performance.

In operation, when sufficient air is accumulated in the air vent chamber, the float mechanism opens the vent valve, and system pressure expells the air to the atmosphere. When the air is expelled the float closes the vent, and the cycle repeats. Additionally, these valves help serve as a vacuum break when the system is drained. All vents are equipped with a manual shutoff. Models supplied with service check valves may be removed for service or replacement while the hydronic system is operating.