Self-acting control valve
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The self-acting control valve does not allow overflow; there is no bypass line, and no valves are present upstream, making it impossible to isolate the flow – the medium is high-pressure gas. The flange connection bolts on the front and back of the valve are loose by a few turns. There is fluid in front of the valve but none behind it; it is suspected that the valve is blocked. I hope experts can help diagnose the problem and suggest how to address it{:3_55:}
Is it due to a large pressure difference between the front and back, the lack of heating, or ice blockage in the throttle? If there is no heating, use steam to blow it clean
The steam tracing has been activated. Expert, what is throttling ice? Just a beginner
This post was last edited by ylb913 on 2018-7-14 at 11:22. Can it be confirmed that the valve is fully open? Ice? It means that the gas contains liquefied gas, and when the pressure drops, it vaporizes, causing a drop in temperature and ice formation that can lead to blockages. If the gas does not contain liquefied gas, and heating is also applied, this factor can be ruled out.
There is no pressure behind the valve; it is open. How can one determine whether it is fully open? Heat tracing – installed this morning
I wonder if this situation needs to be resolved urgently? If possible, it is definitely necessary to determine the opening and closing status of the valve. If that doesn’t work, we’ll find openings on both ends, add temporary cross-cables, and use metal-clad hoses; we’ve done this kind of thing before.
The reduced-pressure furnace has high-pressure gas for the permanent flame; now that the flame is out, it doesn’t affect production for the time being, but the process team needs to handle this as soon as possible...
This process should be evaluated together with the equipment. In many organizations, whenever there is a problem with the equipment, it is considered the responsibility of the equipment technician. In fact, in many cases, equipment problems are related to the process media or the approach used for process control. ——It’s a bit off-topic, but since there’s no rush either, it’s recommended to discuss the process equipment slowly.
For the self-acting valves in the constant-flame tube lines, the CV value is already low; if heating is applied, there is a risk of the valve getting clogged, or there may be mechanical failures in the valve body itself. It can only be taken apart to take a look.