What valve is specifically designed for adjustment or throttling of flow?

• A. Ball valve.
• B. Check valve.
• C. Straight pattern globe.
• D. Butterfly valve.

Answer: (C)

The straight pattern globe valve is specifically designed for the adjustment or throttling of flow due to its unique internal design. It features a movable disk (plug) that can be raised or lowered to vary the size of the flow passage. This capability allows for precise control over the flow rate, making it an ideal choice for applications that require fine tuning of fluid movement.

The globe valve's design minimizes turbulence, which also contributes to its effectiveness in throttling applications. Unlike other valves that may be primarily for on-off service, such as ball valves and butterfly valves, the globe valve excels at regulating flow, allowing operators to achieve the desired flow rate through careful adjustments.

While ball valves and butterfly valves can be used for throttling, they are more suited for quick shut-off applications. Check valves, on the other hand, are designed to prevent backflow and do not allow for flow adjustment at all. Therefore, the straight pattern globe valve stands out as the best option for applications where flow needs to be carefully controlled.