Arizona Driving Permit Written Practice Exam

Fail-safe design of a control valve means that upon loss of instrument air, the valve will:

Stay exactly in its last position Move to a safe position (fully open or fully closed) depending on the process requirement Vibrate continuously Open halfway

Correct Answer:

Move to a safe position (fully open or fully closed) depending on the process requirement

Explanation:

Fail-safe valves are spring-loaded to automatically move to the safest state (Fail Open or Fail Closed) if air is lost.

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