The difference between regulating valve FO and FLO
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FO means accident open, wind off valve, that is, it is fully open when the instrument wind is lost.； If the FLO is on for accident locking, what is the status if the instrument wind is lost? It is fully closed at the beginning. What is the state when the instrument wind is lost?
The difference is that it maintains its original position after losing the instrument wind. As time goes by, the device processing is completed and it is safe, and it gradually opens.
FLO means losing energy and maintaining the current state without changing.
Assuming it was closed before, will it remain closed after the wind breaks?
FLO, the valve position remains unchanged when the instrument air fails, and slowly changes to the "valve open" direction as time goes by.