Post #9986

The original versions of this system didn't use bladders but they did have a way to make sure that enough air stayed in the tank! Remember a few days ago we talked about freeze proofing with a weep hole? When the pump shuts off, the well leaks down a little and we get air into the piping. When the pump runs again, that air gets pushed into the tank along with the water from well. There is a valve inside the tank about half way up called "air volume control valve" that makes sure the tank stays half full of air and lets out any excess air.