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Feature Report: Part 1: Using Installed Gain to Improve Valve Selection
By Melissa Niesen, Emerson Process Management |
The perfect valve to control your process has been selected. The valve will pass your maximum flow. Everything is great, right? In some cases digging a little deeper might help. The control valve usually should not be the most restrictive element of the process, but it also should not be oversized or have performance issues that do not mesh well with the process characteristics.
Typically when a valve is selected, attention is paid to whether the valve is the correct size by determining the travel of the valve (openness) at several operating points. Often these are labeled minimum, normal and maximum. From these conditions, suitability can be judged by seeing that certain rules of thumb are followed. For example
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