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.
3: Consider the inlet water pressure.
Pressure regulating valves can be direct acting, piston operated or
externally piloted models. Choose direct acting valves for flows ranging
from low to moderate. For moderate to high flow rates, use piston
operated or externally piloted pressure reducing valves.
4: Choose the right valve size needed. Choosing the right size is
critical to the longevity of the pressure reducing valve. Over-sized
valves will lead to noise, valve failure and wire draw during low flow
conditions. If more than one size of valve meets your required capacity,
choose the valve that is less expensive and allows you to use smaller
diameter pipes.

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