Why is the valve position of the control valve increasing slowly?
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This post was last edited by Socrates and Di on 2011-6-1 at 11:05. This control valve is used for regulating high-pressure condensate; its position has been calibrated, and there are no issues with its operation. The process parameters also remained unchanged. Under such circumstances, over the course of a month, the value increased gradually from the normal range of 30%-40% to 80%-100%. Logically speaking, there should be no issues with foreign objects in the valve element of the condensate control valve. I’m really puzzled by this; I wonder if anyone has any insights and can help me figure this out?
I’m a technician and not very familiar with different types of valves; it’s probably a gate valve. But the specific type is unclear. There are no process diagrams either.
Is the liquid level controlled in automatic mode?
While maintaining a certain flow rate, the valve position gradually increases: If it is the pipeline at the pump outlet, consider whether the pump filter might become clogged and whether there are any fluctuations in the pump outlet pressure. If there is a filter in front of the valve, check whether there are any foreign objects.
There is no filter before the valve; the control valve is set to automatic mode. There are no pumps either before or after the valve, and flow occurs due to pressure alone. That’s why I’ve remained confused
Reply to 5# Socrates, Di: I have encountered such phenomena as well; in my opinion it’s a problem with the instrumentation. The valve position tends to increase frequently, and with the same pump pressure and the same valve opening, the flow rate still varies. The instrumentation specialist checked the valve and found no issues. . I’m very puzzled. .
Check your gauge pressure pipeline for any blockages or leaks
It’s hard to judge if the information given about the item isn’t detailed enough
Check whether the pipeline where the valve is located is blocked; it has nothing to do with the valve itself.
There will be no problems with the valve itself. Is there non-condensable gas in the system, causing an increase in internal pressure and a rise in flow rate?
One of the biggest headaches in chemical plant operations is when there are problems with instruments and valves, yet the so-called professionals claim that these instruments and valves are fine. . . . There’s no solution anymore