Chapter 10 : Valves

Example 10.1 Page No 225

import math

#Variable initialization
Q=30.0              #gpm flow rate
dp=300.0            #pressure drop lbf/in^2
Sg=0.85             #density
Cv=5.41             #Flow coefficient

#CALCULATIONS
Cv1=Q/(math.sqrt(dp/Sg))  
dp1=Sg*Q**2/Cv**2

#RESULTS
print('\n Flow coefficient = %.3f gpm ' %Cv1)
print('\n Pressure drop = %.3f psi ' %dp1)

 Flow coefficient = 1.597 gpm 

 Pressure drop = 26.138 psi