Regarding the issue of replacing the locator online
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Someone asked how to replace the positioner of an FO valve while it is in operation How to replace the positioner of an FC valve online?
Regardless of the type of valve, when replacing the positioner, control should be switched to use the control line associated with the control valve.
Can anyone share an example of online replacement? Let me learn it too!
It is the safest option to switch to the bypass line when one is available. When there is no auxiliary line, the valve position is fixed using a handwheel; after replacing the locator, it is necessary to find a way to provide a limit for the control valve, and the locator must be adjusted within the limits permitted by the process – there is no other choice.
What is line control? ? Could you popularize some knowledge?
The so-called feed line is a bypass pipeline set up in the process. Close the manual valves before and after the control valve; the process medium will flow through the manual valve on the bypass line. Find a flowchart to take a look at
The bypass route involves closing the valves before and after the control valve, allowing the medium to flow through a detour. It’s difficult to replace without a bypass. .