Of the one or two types of plug valves, the lined plug valve can be employed to stop leaks while the valve is in service and without line interruption by tightening down the packing flange. Furthermore, the adjustments are designed in such a fashion that it can be performed by a plant operator equipped with merely 2 pliers. These  are lined plug valve bidirectional and absolutely independent of line pressure. The first seal to the atmosphere is between the plug and the seal band at the top of the liner. As a secondary seal, a dynamic self-adjusting, self-energized reverse-lip PFA diaphragm seal prevents stem leakage in the most ill-conditioned applications. Majorly, these valves are used to carry liquids and gas ( as well as vapor ) in numerous pipelines with high corrosive materials like acids / alkaline, and salt.

In the production of more dynamic pipeline applications sever service plug valve are advised for use because of their design that targets tight emission control to ensure safety in more demanding environments. This valve is meant for applications in processes involving thermal cycling or a high number of mechanical operations. Grim service valves are meant for maximum safety assurance in sensitive operations and are recommended for high-temperature piping.

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