Introduces air into the system at an atmospheric pressure
I think that is what caused my water lines to have too much air in the water
In the incoming water line from well, before pressure tank.
foot valve leaking,
Well, pump, storage tank, pressure switch, pressure gauge, Cycle Stop Valve, tank tee, drop pipe, wire, (with a submersible pump) gate valve and possibly water filtration. bob...
A foot valve, in relation to a water well, is a check valve at he bottom of a well to keep the water from running back into the well from the pump when the pump is not running. If the check valve does not hold the water the pump will lose it's prime and will not pump water.
It is pumped into your home water system by the city water supply, or if you have a well, it's pumped into a pressure tank and then into your home. Either way when you open a faucet (essentially a valve) the water will come out.
If you are using a jet pump you must have a good foot valve, then remove the prime nut or gauge from the top of the pump and fill the pump and pipe with water. You may have to do this a number of times to get all the air out of the system.
Excessive pressure
Your pump or foot valve could be very near 'static level'. It may need to be lowered. But many other factors could be at work such as a fault in pump or pressure system.
You will have to dig the well deeper and adjust the length of the pipes to reach the water where the foot valve or pump is.
If you have a septic system, you are generally outside the city limits. So your water is probably not city water, it's well water from your own or a shared well.
Low pressure causes:Low pressure supply from the mainIn a rural or well system a worn or failed pressure switch.In a rural or well system A leak in the casingIn a rural or well system a worn or failing pumpMineral build up inside pipesA partially closed main supply valve either curb stop or in house supply valvekinked or damaged pipe either under ground or inside.If there is a water softener or filter these can fail or become plugged.In Europe many houses have booster pumps to boost pressure and flow, these fail also.