In pipeline and water pipe construction there are several types of valves that are required to apply secure seals to guarantee the lack of leaking ; among these valves are sleeved plug valves, which are non-lubricated valves that achieve secure sealing through the employment of a compressible sleeve as a sealing agent. In many circumstances they operate maintenance free and with simplicity of use. Plug valves are very versatile valves that are found typically in low-pressure industrial applications, particularly in the development of petroleum pipelines and similar sorts of piping. plug valve are also highly employed in chemical processing and related fields, and power plants. These valves can be used in high capacity directional flow control ; they can also safely and efficiently handle gas and liquid fuel, and extreme temperature flow.
Of the a couple of kinds of plug valves, the lined plug valve may be employed to stop leaks while the valve is in service and without line interruption by tightening down the packing flange. Similarly, the adjustments are designed in such a way that it can be performed by a plant operator equipped with just a pair of pliers. These lined valves are bidirectional and totally independent of line pressure. The primary seal to the atmosphere is between the plug and the seal band at the very top of the liner. As a secondary seal, a dynamic self-adjusting, self-energized reverse-lip PFA diaphragm seal prevents stem seepage in the most ill-conditioned applications.

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