On vessels using reach rods to manually control the tank valves, one turn of the handwheel on deck will produce how many turns of the valve stem at the valve?

In USCG Marine Engineering General Subjects, for engine room systems involving 'On vessels using reach rods to manually control the tank valves, one turn of the handwheel on deck will produce how many turns of the valve stem at the valve', the standard operating requirement is: 'One turn'.