The GAIRUI PTFE Sleeve Plug valves (full lining type) and bushing stopcock (semi lining type). Plug valves are mostly used for cutting off medium flow, and also for medium distribution (three way stopcock). The fluorine lining valve is suitable for various concentrations of water, sulfuric acid, hydrochloric acid, hydrofluoric acid and various organic acids, strong acids and strong oxidizing agents at -29~150 Degree C. FEP is also suitable for the use of various strong alkaline organic solvents and other corrosive gas and liquid medium.