Suppose a remote valve operator is fitted with a gearbox. What is the purpose of the gearbox?

Correct Answer: Option B — The gearbox may be used to change the orientation of the hand wheel to the valve stem, or it may be used to reduce the turning effort, OR both.

Gearboxes in remote valve operators serve dual purposes: they provide the necessary angular change to align the handwheel with the valve stem and offer mechanical advantage. By utilizing gear ratios, they reduce the manual effort required to seat or unseat large valves, facilitating easier operation for the crew.