The formula to calculate the pressure drop (ΔP) is:
\[ \Delta P = \left( \frac{Q}{Cv \times \sqrt{SG}} \right)^2 \]
Where:
Cv, or flow coefficient, is a measure of the capacity of a valve to pass fluid. It is defined as the flow rate of water in gallons per minute (GPM) at 60°F that will pass through a valve with a pressure drop of 1 psi. The higher the Cv, the greater the flow rate through the valve for a given pressure drop.
Let's assume the following values:
Using the formula to calculate the pressure drop:
\[ \Delta P = \left( \frac{100}{50 \times \sqrt{1}} \right)^2 = \left( \frac{100}{50} \right)^2 = 4 \]
The Pressure Drop (ΔP) is 4 psi.
