Automatic Air Vent Valve Leaking Water

Two taco automatic air vents on boiler.

Automatic air vent valve leaking water.

Here we explain how to repair or replace both manual heating system air bleed valves and automatic float type air vents that are leaky. It consists of a brass body construction with male npt connection brass cover air vent with silicone rubber seal polyethylene float with valve plug and automatic. For the heck of it i tried switching the autovents. The one that was leaking did not leak at the new location but the other non leaking one leaked in the leaking location.

It has an air purger with an expansion tank screwed into the bottom and an automatic air vent on top of the air purger. An automatic bleeding valve or air release valve arv is a plumbing valve used to automatically release trapped air from a heating system. Float type automatic vents on hot water heating systems are normally left open to automatically purge air from the system. Guide to repairing an auto air vent aav.

The air vent is leaking some water. I tried cleaning it out and reinstalled but it still leaked. Switched back and the leak is because of the location. Leaky hot water heating system vent repairs how to repair a leaky hot water air vent or bleeder valve.

Based on tapping the expansion tank it does not seem waterlogged bottom 2 3rd of tank sounds hollow or empty. When air is purged the discs come into contact with system water which causes. The coin vent features special hygroscopic cellulose discs in the valve body that when dry allow air to be released from the system.