Which valve is used to increase or decrease flow through a pipeline?

• A. Check valve
• B. Ball valve
• C. Globe valve
• D. Gate valve

Answer: (C)

Controlling how much fluid moves through a pipe is about throttling—the ability to adjust flow. The globe valve is built for this purpose. It uses a movable globe plug that sits against a fixed seat. When you turn the stem, the plug rises or lowers, changing the opening between the plug and seat. That lets you dial in the flow rate with smooth, predictable changes, even as pressure varies. That precise throttling capability is what makes it ideal for increasing or decreasing flow.

Other valves serve different primary roles. A check valve only prevents backflow; a ball valve provides quick, on/off shutoff with a round ball that rotates to block or allow flow, not precise control; a gate valve opens fully or closes, and its linear flow isn’t suited to fine regulation. So for adjusting flow, the globe valve is the best choice.