New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is a significant benefit of using a lubricated plug valve?

1. It reduces costs significantly.

2. It prevents seizing and maintains a positive seal.

3. It can operate at any temperature.

4. It does not require maintenance.

The correct answer is: It prevents seizing and maintains a positive seal.

A lubricated plug valve offers the significant benefit of preventing seizing and maintaining a positive seal. The lubrication reduces friction between the plug and the valve body, which is essential for smooth operation. This characteristic is particularly important in environments where frequent operation or changes in temperature and pressure may occur, as it helps ensure that the valve can open and close easily without becoming stuck. Moreover, the lubrication enhances the sealing capability of the valve, as it allows for a more consistent and effective seal when the valve is in the closed position. This is crucial for applications where leakage could lead to safety hazards or loss of product. The combination of these factors contributes to overall operational reliability and efficiency in piping systems. The other choices do not pertain to the specific advantages that lubrication provides; for instance, while cost and maintenance are important factors in choosing a valve, they do not directly relate to the unique benefits found in lubricated plug valves. Moreover, the ability to operate at any temperature is not accurate, as each valve type, including lubricated plug valves, has specific temperature limitations based on the materials used and the design.