True or false? A plug valve requires lubrication.

A plug valve is a type of valve that is used to control the flow of fluids through a pipe. It consists of a cylindrical or conical plug that rotates within the valve body to either allow or block flow. Lubrication is important for plug valves because it helps ensure smooth operation and prolongs the life of the valve. The lubrication reduces friction between the moving parts, preventing wear and tear that can result from constant movement and sealing against the valve body.

While some plug valves are designed for specific environments or conditions that may not require lubrication, generally, to maintain optimal performance and reliability, it is advisable to lubricate plug valves. This is particularly true in applications where the valve may experience frequent operation or where the media flowing through the valve could cause corrosion or accumulation of debris.

The other potential options suggest scenarios where lubrication may not be considered necessary; however, regular lubrication is an important maintenance practice for most plug valves to ensure they function properly over time.