New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Which statement about composition disc globe valves is accurate?

1. They cannot be interchanged for different services.

2. The disc must always remain the same.

3. The disc can be changed to suit different service types.

4. They are only used in a single type of service.

The correct answer is: The disc can be changed to suit different service types.

The statement regarding composition disc globe valves indicates that the disc can be changed to suit different service types, which is a crucial feature of these valves. This flexibility allows for adaptation to various fluids and service conditions, enhancing their usability in diverse piping systems. Composition disc globe valves are designed in a way that allows for different disc materials and configurations to be utilized depending on the specific requirements of the application. For instance, if a valve is initially set up for a certain fluid, such as water, it can be modified to handle oils or corrosive materials simply by changing the disc. This adaptability to different service types improves performance and longevity, as using the appropriate disc material can mitigate wear and resistance to chemical reactions. In contrast, options that suggest limitations on interchangeability or service types do not apply because the design of composition disc globe valves inherently supports modification to meet different operational needs.