Historically we have always used globe style control valves in most of our process applications. How can I best determine when to use a ball or butterfly valve in those applications?
There are a number of considerations that you have in the selection process but number one is what valve will provide the best overall process performance while meeting your budget concerns. For this reason full port or reduced port ball valves and segmented ball may provide a very good solution. While globe valves provide a wide range of options in flow characteristics, pressure, temperature, noise reduction, etc., ball valves provide higher rangeability and nearly twice the flow capacity of globe valves. Ball valves are also less expensive than globe valves. High performance butterfly valves are even less expensive than ball valves, especially in larger sizes, and can provide good control. However, they also have less rangeability than ball valves and are more prone to cavitation. When trying to obtain a particular flow characteristic Metso Automation offers a rotary eccentric plug valve that provides a near linear characteristic. flow curves for all 3 of these valves can also be enh
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