Galvanized Tank Air Volume Control Placement

[lzenglish]

Hello. It seems that older Verticle Galvanized Tanks have their Air Volume Control tap set about 2/3rds up from the base of the tank. The new tanks have the tap set at 1/2 the way up from the base of the tank. Why is this? Will it make a differance on my drawdown? If so, can I bend the Air Volume Control float down to compensate for this? I do not want to weld a new tap in, for fear it will destroy the Galvanizing material.

Thanks

 

[Valveman]

The most you get from pressure tanks is about 15% draw down. Not going to make much difference on the location of the AVC.

 

[Sponsor]

 

[lzenglish]

Thanks for the Good Info., but if the AVC is set higher, would it not allow More water, and less air to charge the Tank? It seems that the new tank manufactures are looking at a 50/50 ratio for the best working system. I have been unable to get an answer from tank manufacturers on this point. It seems the AVC location was pulled from a hat, not engineered.

 

[lzenglish]

So you are saying no matter what the location of the AVC is on the tank, it can be adjusted for maximum air charge? And the more Air charge the more draw down? I will try this! My only way of knowing the water level is to feel the cold tank level, I wish I had a sight glass, but have no ports to install one. Thanks Again