What is one benefit of using a lubricated plug valve compared to a non-lubricated plug?

A lubricated plug valve provides the significant advantage of helping to prevent seizing while maintaining a positive seal. This is particularly important because plug valves can be subject to wear and corrosion over time, especially in corrosive environments or with the passage of certain fluids. The lubrication in the valve aids in reducing friction between the plug and the valve body, which minimizes the chance of the plug becoming stuck or difficult to operate. This feature is crucial for ensuring reliable operation and longevity of the valve, as well as for maintaining the integrity of the seal when the valve is closed.

In contrast, non-lubricated plug valves may encounter operational issues over time, such as sticking or leaking due to wear from friction. The lubrication ensures smoother operation and helps the valve to perform better under various conditions, making it a preferred choice in many applications requiring reliable sealing and accessibility.