Can a pneumatic diaphragm control valve achieve an opening degree of 30% after failing? What methods can be used to achieve it
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Can a pneumatic diaphragm control valve achieve an opening degree of 30% after failing? What methods can be used to achieve it
Once the fault is resolved, it will be possible to achieve.....
It’s just that there’s no instrument air anymore. The valve opening degree is required to be 30%
Set the handwheel to 30% please
Regarding the maintenance of the valve position, it is possible to address this in the short term by adding gas cylinders or electromagnetic valves
Fixed at 30%; under normal conditions, it is likely necessary to maintain an opening of 30% as well. Otherwise, if you need to close it completely, manual intervention will be required
Hardware failures (such as issues with instrument air or cables) are generally addressed through mechanical interlocks, while software failures (such as problems with fan control) can be handled by setting fault limits in the DCS.