New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What type of valve is primarily used for better flow control at low pressures?

1. Globe valve

2. Ball valve

3. Butterfly valve

4. Check valve

The correct answer is: Globe valve

The globe valve is primarily used for better flow control at low pressures due to its design, which allows for precise regulation of fluid flow. The internal structure of a globe valve includes a movable disk or plug that can be adjusted to throttling position, which helps in controlling the flow rate effectively. This feature makes it particularly suitable for applications where flow adjustment is necessary. In contrast, the ball valve typically provides full flow and is best for on/off applications rather than for throttling. Although it can be used for flow regulation, it does not offer the same level of control as a globe valve at lower pressures. The butterfly valve is often used for larger flow volumes and is not as efficient at controlling flow at low pressures compared to globe valves. Lastly, the check valve is designed to prevent backflow rather than to regulate flow; it automatically allows fluid to flow in one direction while preventing reverse flow, which doesn't align with the goal of better flow control. Thus, among the options provided, the globe valve is the optimal choice when aiming for improved flow control at low-pressure scenarios.