every once in a while I loose all water pessure from my well. I shut off the power to the well pump for a few hours and then when I turn it back on every thing is fine for a few months again. on pressue is at 35psi and off pressure is 55psi. water pressure coming in to tank when running is 70 to 85 psi. Is their a relief valve to stop all water from empty out of tank and water lines when pressure goes out or down below the pressure setting to turn on the pump?
It depends on what kind of system you have. Ther may be a check in the pumpset upstairs, or there might be a foot valve in the line at the bottom by the well point. If a shallow-well injection line is clearing sediment from a drain-back, that is one possibility.