Keeping air pressure up on a remote conventional tank system.
So we are trying to set up a holding/pressure tank. It is going to be a conventional tank without a bladder, it is about 5,500 gallons. We want to install the tank on the uphill side of our property away from the pump and well. This will allow us flow and pressure in case of power/pump failure.
Originally, we were going to set this up as a dedicated gravity system, but we don't have enough elevation drop for desired pressures. So now we want to pressurized the system and are trying to plan for anticipated problems.
One problem is that the air in the tank will absorb into the water and we will lose the air pressure and volume in the tank to maintain pressure. Adding a compressor or air line to the tank are options, but not ones we want to have to go to since the tank will be installed a long way from power.
I was wondering if I can install a bleeder and snifter valve allowing air to be injected into the tank when the pump cycles. In theory it would work, but our problem with this option is that we have only one line into and out of the tank. Tank is plummed for two, but because this was to be a gravity pressured system, my dad only planned on and burried one line- so it is the supply and discharge line depending on if the pump is running or not.
What I need is a 3 port, dual direction check valve of some sort that would alow us to tee off and isolate a portion of pipe that would have the snifter and bleeder installed on it. It would allow flow to the tank from the pump past the bleeder and snifter when the pump is running. It would then close the supply side of the snifter/bleeder line and allow discharge out of the tank to supply the system until the pressure/water level dropped enough for the pump to cut in. If there was something that was controlled by flow of the outlet side of the valve, that would be ideal.
If I forgot to explain something, I am sorry. Just ask me and I will try to clarify.
Thanks for the help!