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The flange type ball valve is a new type of valve and that is widely used. This ball valve full bore has the following advantages: 1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length pipe. 2. Sealing performance is good, flange type ball valve's seat widely uses plastics, such as PTFE, RPTFE, NYLON, PEEK. and flange type ball valve has been widely used in vacuum systems. 3. It is easy to operate and can open and close quickly. It only needs to rotate 90° from fully open to fully closed, which is convenient for long-distance control. 4. It is easy to maintain, the structure of flanged type ball valve is simple, Sealing ring generally is movable, easy to disassemble and replace