Answer / rajesh.kon

Control valve will turn its failure position either close or
open (FO/ FC)

Answer / nikunj dungarshi furia

it will return to its position at no signal condition i.e.
either normally closed (air to open / fail closed) or
normally open (air to close / fail open)

Answer / james

Based on the process
1st If barrier fails before escalating to a incident - The answer is fail safe c/v CLOSE
2nd when barrier fails - fail safe action done - Then the fail safe action will be - c/v OPEN to atm / flair

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