A few years ago my foot valve or piping on my 2 line jet starting leaking, in itself will only hold 15psi, so I put a check between the pump feed and the pressure switch, keeps my house/tank up to pressure but the pump drop lines pressure quickly drop to 12-15psi or so.
Been working flawless for a few years, however I'm in the middle of converting my dug well to a submersible since I know sooner then later ill probably loose my prime.