New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What are the two general classifications of diaphragm valves?

1. Weir and valve

2. Ball and globe

3. Weir and straight way type

4. Reducing and full port

The correct answer is: Weir and straight way type

Diaphragm valves are categorized into two general classifications based on their design and operational characteristics: the weir type and the straight way type. The weir type diaphragm valve features a raised seat, which creates a flow path that promotes good shutoff and throttling capabilities. This design is particularly effective for handling slurries and viscous fluids, as it minimizes the likelihood of buildup on the seat. On the other hand, the straight way type diaphragm valve has a design that allows for a more direct flow path, which can be advantageous when minimal pressure drops are desired. This classification is used when there are concerns about the integrity of the fluid and the need for less resistance in the flow. Understanding these classifications is essential for selecting the appropriate valve type for specific applications in pipe fitting and hydraulic systems, as each type offers unique advantages depending on the characteristics of the fluid being controlled.