Automatic Air Vent Leaking Water

I do leave automatic air vents active in open loop systems like cooling towers.

Automatic air vent leaking water. The quality of these vents is about the same irrespective of make. The air vent is leaking some water. It has an air purger with an expansion tank screwed into the bottom and an automatic air vent on top of the air purger. The air bleeder pictured has a fouled seal and allows water to escape as well as air.

How do i go about changing it. When the rising water expels all the air the float lifts cutting off the outlet and retaining the water the dust cap should be slightly open all the time over time the needle valve often gets gummed up and the vent leaks. If you are going to replace make sure that when you unscrew you have isolated the water. Alot of times a leak can be traced back to the relief valve opening.

Air vents automatic air vents should be isolated after original fill of closed hydronic systems. I don t see any valves that allow me to isolate the air. This is is most commonly due to a water logged x pansion tank. If you mean the schrader valve on the expansion vessel is leaking water then the membrane in the vessel is burst.

This is by no means a fault caused by the automatic air vent. As the air escapes the float rises again and seals off the top of the automatic air bleeder preventing water from escaping. A high pressure will cause the pressure relief valve to open typically 3 bar if the auto air vent is leaking water it needs changing. Just look at the brown colour water coming from the aav.

Like ice sailor said just close caps next tme. You can see the signs clearly that this heating system is badly sludged up. Furthermore the air bleeders are non serviceable and need to be replaced when. Based on tapping the expansion tank it does not seem waterlogged bottom 2 3rd of tank sounds hollow or empty.

Amazon tool shop here. Air rises in the pipe allowing the float to fall and open the needle valve to let the air escape. As time goes on corrosion and minerals foul the seal at the top of the float in the automatic air vent.