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 control 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.

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Car System Function

2011-08-23

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