For our system, At this point, some people would be tempted to go to the valve charts or characteristic curves and select a valve. Preliminary valve selection Don't make the mistake of trying to match a valve with your calculated Cv value. The Cv value should be used as a guide in the valve selection, not a hard and fast rule. The valve chart for this type of valve is shown below. Not yet, there are still some characteristics to consider.
Judgements plays role in many cases.
Or is it more likely to operate near the minimum flowrate for extended periods of time. It's difficult to find the perfect valve, but you should find one that operates well most of the time. Notice that we used the maximum pressure drop of 15 psi once again in our calculation. Essentially, at lower pressure drops, Cv would only increase which in this case would be advantageous. Also note that the gain should never be less than 0.50.