I don't understand the question. A pressure switch has nothing to do with holding prime. Is this for domestic water or for irrigation?
With a small sandpoint, there is no way to use a footvalve. Often, a checkvalve is used at the top of the wellhead. You can place the checkvalve closer to the pump but should not place it too close to the pump because it can disturb the laminar flow and cause some cavitation.





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