New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is a characteristic feature of a lubricated plug valve?

1. It uses water for lubrication.

2. It requires less sealing effort.

3. It is only for low-pressure systems.

4. It typically has a larger size than non-lubricated valves.

The correct answer is: It requires less sealing effort.

The characteristic feature of a lubricated plug valve is that it requires less sealing effort. In these valves, a lubricant is introduced into the valve body, which assists in sealing the plug against the valve body. This lubrication helps to reduce friction when the valve is operated, making it easier to turn the plug and create a tight seal. As a result, the effort needed to operate the valve is reduced, which is particularly beneficial for larger or heavier valves where manual operation may be challenging. This feature is crucial for ensuring reliable and efficient operation in various applications, as it minimizes wear and prolongs the valve's lifespan. A lubricated plug valve can be beneficial in situations where frequent operation is required, as it can lead to less fatigue on valve operators and lower maintenance costs over time.