Checking Manual Throttle Valve Position (Section 4.4): When operation of a throttled valve is necessary to determine its position, consult with the appropriate Operations supervisor prior to manipulating. Check throttled valve position by counting the number of 360-degree turns required to fully close the valve, then re-position the valve by opening the same number of turns counted. Restoring locked throttled valves requires concurrent verification. Personnel must be aware of mechanical valve operator slack.