Question: b the maximum flowrate through a control valve with an...
b) The maximum flowrate through a control valve with an
percentage characteristic is 10 m3/h. If the valve has a rangeability
ratio of 50:1 and is subjected to a constant differential pressure,
calculate the percentage change in flowrate through the valve for
valve lifts at 10% intervals.
Hence show that the valve is indeed equal percentage by finding the
change in flowrate from one interval to the next.
[n.b. a spreadsheet would be a useful tool to use in this question!]