When fully opened, which type of valve is likely to create the highest head loss?

The globe valve is designed primarily for throttling, and its internal structure is optimized for controlling flow rather than allowing it to pass through with minimal resistance. When fully opened, a globe valve still has a significant amount of flow disruption due to its internal geometry, particularly the bend and the plug design that restricts flow. This results in higher head loss compared to other valve types.

In contrast, ball valves and butterfly valves are designed for straight-through flow, allowing fluid to pass with less resistance when fully opened. While check valves are also critical in certain applications, they do not have the same flow characteristics as globe valves when discussing head loss in a fully open condition.

Thus, among the choices presented, the globe valve produces the highest head loss because its design inherently limits flow efficiency, even when fully opened.