We have found that the best method to control the rate of flow of the fertiliser being pumped is with the use of the Maric precision flow control valve. Usually we would use a standard PVC bodied valve with the nitrile elastomer. At the selected flow rate, the pump would then be selected to deliver at least 20m more head at that flow rate than the highest pressured irrigation shift (at the injection site).
Ian Arnold B.App.Sc.Ag.
TOTAL EDEN PTY LTD