I have a flow control valve for steam, where the trend across 4 months period shows that the valve opening is different, for the same PV. Meaning the valve opening is going from 64% up to 90 something % for a steam flow of almost constant around 70t/hrs. Any reason why such variation in the control valve ? If there is a problem , any way to troubleshoot this and what parameters to look at ?
Your thoughts please
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