dear David, thanks for your clarification. however, the line pressure is stable only flow and valve Fluctuating please advise.Since you say it 'start'-ed malfunctioning, and the valve can control to a steady state in manual mode, then something in the process has changed.
Either find out what's changed and change it back or re-tune the process controller that drives the valve position to take into account the new process conditions.
Neither I nor anyone else on the forum can tell you what's changed, because we're not there.
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