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[ pdf ] Valve Sizing Calculations

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Topic under  Valve System
Source: www.documentation.emersonprocess.com
File size: 1.13 MB
File type: pdf
Short Desciption:
FisherŪ regulators and valves have traditionally been sized using equations derived by the company.

Summary:
There are now standardized calculations that are becoming accepted worldwide. Some product literature continues to demonstrate the traditional method, but the trend is to adopt the standardized method. Therefore, both methods are covered in this application guide. Improper valve sizing can be both expensive and inconvenient. A valve that is too small will not pass the required flow, and the process will be starved. An over sized valve will be more expensive, and it may lead to instability and other problems. The days of selecting a valve based upon the size of the pipeline are gone. Selecting the correct valve size for a given application requires a knowledge of process conditions that the valve will actually see in service. The technique for using this information to size the valve is based upon a combination of theory and experimentation.

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