New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What are the two main types of butterfly valves?

1. Wafer and single flanged.

2. Wafer and double flanged.

3. Single flanged and double flanged.

4. Wafer and ball valve.

The correct answer is: Wafer and double flanged.

The two main types of butterfly valves are typically classified as wafer and double flanged. Wafer butterfly valves are designed to fit between two flanges in a piping system, providing a compact solution that is easy to install and suitable for systems with limited space. They are characterized by their simple installation method and the fact that they do not have significant protruding components, making them ideal for applications where the valve needs to be tightly integrated into existing piping. Double flanged butterfly valves, on the other hand, feature flanges on both ends of the valve that allow for bolting directly to the pipeline flanges. This design provides enhanced stability and can support higher pressure applications. The double flanged design also allows for easier alignment and installation in larger systems. In contrast, single flanged valves involve a single flange connection, which can limit their application in many systems. Other options, such as ball valves, do not classify as types of butterfly valves; they represent a different valve type with distinct operational principles. This comprehensive understanding of these valve types forms the basis for selecting the right valve for specific applications in plumbing and industrial systems.