Plug valves are valves with cylindrical or conically-tapered "plugs" which can be rotated inside the valve body to control flow through the valve. Plug valves usually do not have bonnets but often have the end of the plug with the handle exposed or mostly exposed to the outside. In cases like that, there is usually not much of a stem. The features of the Sleeve Type Soft Sealing Plug Valve can be described as this:Its sealing is realized by the sealing face around the sleeve. It has unique 360 degree metal edge for protection and fixing of the sleeve. There is no cavity in the valve for accumulation of medium. Metal edge provides the function of self-cleaning when the plug is rotated, applicable to the operation condition that is glutinous and apt to smudge. Double direction. The product detail:1>Design and Manufacture: API599,API 6D. 2>Face to face(end to end) ANSI B16.10. 3>Flanged connection ANSIB16.5 4>Test and inspection API598,API6D