Why is a globe valve good for throttling?

• A. Because it's round and the disk will wear evenly
• B. Because it's cheap to manufacture
• C. Because it seals without leakage
• D. Because it can be used in high-temperature service

Answer: (A)

Globe valves are well suited for throttling because their disk moves linearly toward and away from a flat seating surface, creating a controllable restriction that can be adjusted in small, precise increments. The contact between a round disk and its seat tends to wear evenly around the circumference, helping maintain a consistent, predictable control over many cycles. This combination—linear, fine adjustment with reliable, repeatable flow change—makes globe valves effective for throttling. Other points like being cheap to manufacture or handling very high temperatures relate to broader valve design considerations, not to the specific ability to throttle smoothly, and sealing without leakage is more about shut-off than modulation.