Air Control Valve

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Chrisw1958

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What is a air control valve and what does it do on a bladderless tank? Is it mandatory?
 

NHmaster

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It maintains the air cusion in the top of the tank and no, it's not strictly mandatory but without it you will have to drain the tank and re-establish the air cusion a couple times a year or more.
 

Cacher_Chick

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There is more than one type of setup. Peter is referring to one that allows air INTO the tank. When the air bleeders are in the well, a float-style AVC works to allow the excess air OUT of the tank.
 

Chrisw1958

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This had a steel tank and whenever the pump shut off it made a little pffft sound. My boss put in a bladder tank and it is getting air probably from the well as I have learned here. I guess we need to go back with a regular tank but I wondered where to buy the float style avc? Where do you get galvanized tanks all I see is steel with epoxy liner?
 

Cacher_Chick

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Epoxy lined is the "new and improved" galvanized-style tank.

The AVC is Grainger part# 7P020 . Probably also available at any good plumbing wholesaler.
 

Texas Wellman

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Ratio of galvanized tanks to bladder tanks. For every 1 bladder tank in this area there are probably 2 galvanized regular tanks.
 

NHmaster

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Funny how they do different things in different parts of the country. Nobody installs non bladder air tanks up here. I have not used one in better than 30 years. Doubt I could even get one from my wholesaler unless I special ordered it.
 
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