New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Which statement about valve types is FALSE?

1. There are only three types of valve end connections.

2. A butterfly valve can be used for flow regulation.

3. A check valve operates based on pressure differentials.

4. A gate valve is suitable for on/off applications only.

The correct answer is: A butterfly valve can be used for flow regulation.

The assertion that a butterfly valve can be used for flow regulation is misleading. While butterfly valves are often used in flow control applications, they are not ideal for precise flow regulation due to their design and operating characteristics. Butterfly valves can indeed adjust flow rates, but they tend to be more efficient and reliable when utilized as on/off valves. When partially open, butterfly valves can create turbulence, leading to inconsistent flow and potential damage over time, particularly if used for delicate flow regulation. In contrast, the other statements are accurate. The claim regarding the three types of valve end connections outlines a common misconception, as there are various classifications of valve connections that go beyond just three types. Check valves do indeed operate based on pressure differentials, allowing flow in one direction while preventing backflow. Lastly, gate valves are specifically designed for either full open or full closed positions, thus making them unsuitable for throttling or regulating flow. Understanding the intended applications and limitations of different valve types is crucial for effective piping system design and operation.