Method for determining amplitude of stick-slip on a valve assembly and implementation thereof
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United States of America Patent
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Mar 20, 2018
Grant Date -
Oct 1, 2015
app pub date -
Oct 3, 2014
filing date -
Mar 31, 2014
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Abstract
A method for processing operating data (e.g., position, setpoint, and pressure) for a valve assembly. The method is configured to associate characteristics of operation for the valve assembly with a root cause and/or a contributing factor. In one embodiment, the method can assign a first amplitude with a value that quantifies movement or “jump” of the valve stem that results from stick-slip on the valve assembly. The method can also assign a second amplitude with a value that quantifies a change in the data for the setpoint. The method can further ascertain the relationship or “position” of the first amplitude relative to the second amplitude, or vice versa. The method can use the relationship between the first amplitude and the second amplitude to indicate the root cause of the operation of the valve assembly.
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