What type of valve is commonly used for throttling flow?

The globe valve is specifically designed for throttling or regulating the flow of liquids or gases. Its internal structure features a movable disk that can be positioned to either open or close the flow path, allowing for fine adjustments in flow rate. The unique shape of the globe valve creates a significant pressure drop across the valve, which is beneficial in applications where precise flow control is required.

In contrast, ball valves are typically used for on/off service and are not ideal for throttling because they are designed to create a tight seal, which can lead to water hammer or damage if used to restrict flow. Gate valves are primarily used for fully open or closed applications, rather than for controlling flow, as they do not provide the gradual modulation of flow needed for throttling. Check valves are designed to prevent backflow and are not intended for flow control at all, as their primary function is to allow fluid to flow in one direction only.

Thus, the globe valve stands out as the best option for applications that require flow adjustment and control, making it the most suitable answer for this question regarding throttling flow.