1:Determine the size  of the valve
needed based on the system demands. The term fall-off refers to the
difference between the pressures on the valve outlet and the inlet
pressure. If the demand is more, there will be a greater fall-off. Study
the performance curve provided by the valve manufacturer. These charts,
also known as valve capacity charts, show a plot of the flow rate
against the pressure fall-off for valves of various sizes. Choose the
chart for the maximum flow rate of your system and locate the fall-off
for this flow rate. Select the valve size that gives a fall-off in the
range of 10 to 15 psi for your system flow rate.
2:Determine theparameters by
measuring the inlet pressure. Choose the outlet pressure you require,
which should typically be in the range of 50 to 70 psi for domestic
applications. Decide on the minimum and maximum flow rates you need to
maintain in gallons per minute or liters per minute.

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