SC Pressure And Process Piping Practice Questions - South Carolina Pressure And Process Piping Contractor Examination Exam

A control valve is specified fail-closed (FC / air-to-open). What happens if instrument air is lost?

The valve strokes to the closed seat under spring force The valve locks in the last position only if it is a fail-open valve The valve always opens wide so the pump can run away Fail action is unrelated to the actuator spring

Correct Answer:

The valve strokes to the closed seat under spring force

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