three plate welded ball valve

following advantages: 1. The fluid resistance is small, its resistance coefficient with section of equal length. 2. Simple structure, small volume, light weight. 3. Compact and reliable, the widespread use of plastic ball valve sealing surface of materials, good sealing, also has been widely used in the vacuum system. 4. Easy to operate, open and close quickly, from open to close just rotate 90 , is advantageous for the remote control. 5. Easy maintenance, simple structure