# Question: b the maximum flowrate through a control valve with an...

###### Question details

b) The maximum flowrate through a control valve with an
equal

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!]