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 the parameters by measuring the inlet pressure. Choose the outlet pressure you require, which should typically be in piloted pressure reducing valves 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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