Which type of valve is commonly used for throttling purposes in boiler systems?

A globe valve is commonly used for throttling purposes in boiler systems due to its ability to regulate flow effectively. The design of a globe valve includes a movable disk or plug that can be raised or lowered to control the passage of fluid through the valve. This design allows for fine adjustments to the flow rate, making it ideal for applications where precise control is needed, such as in boiler systems where steam or water flow needs to be adjusted to maintain desired operating conditions.

In contrast, other types of valves like gate valves are primarily used for on-off control and do not provide the same level of flow regulation. Ball valves offer quick shut-off capabilities but are not designed for throttling and can cause turbulence if partially open. Check valves are one-way valves designed to prevent backflow and are not used for throttling. Therefore, among the options provided, the globe valve stands out as the most suitable choice for throttling in boiler systems.