Which valve is commonly used to throttle flow in piping systems?

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

Answer: (C)

The ability to regulate flow smoothly and predictably is what makes a valve suitable for throttling in piping systems. The globe valve is designed for this purpose: its internal geometry, with a movable disk hugging a stationary seat, creates a controllable, variable orifice. As you turn the stem, the disk moves in and out, giving a steady, incremental change in flow and a relatively predictable relationship between valve position and flow rate. It also provides good shutoff when fully closed, making it versatile for both regulation and isolation.

Ball valves are excellent for quick on/off with minimal pressure drop when fully open, but their flow path isn’t ideal for fine, precise throttling, especially in partially open positions. Check valves are intended to prevent reverse flow and don’t offer throttling control. Gate valves allow a lot of flow with low resistance when fully open but don’t regulate well—the flow changes are less predictable as the valve opens, making them poor choices for accurate throttling.

So, for controlling flow with fine, predictable adjustment, the globe valve is the standard choice.