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Thank you for the advice...

I have taken over a property that has an unusual irrigation (for Me) design. The pump is a Cent. pump 2HP 2" suction from lake and feeding only 2 circuits both up hill and both controlled by 2" rainbird plastic solenoid valves. Note: There is no check valve in the suction line or just out of the pump. The system works but the valves cannot hold closed and the lines drain back through the pump. Over time the pump looses prime. Should I install a check valve? If so...Where? As a foot valve at the ...