Hard seal pneumatic ball valve

advantages: 1. The fluid resistance is low, its resistance coefficient equal with the same length of pipe . 2. It has Simple structure, small volume and light weight. 3. Because of good sealing , reliable structure, not only it widespread use of plastic ball valve sealing surface of materials, ,but also has been widely used in the vacuum system. 4.it is Easy to operate, open and close quickly and from open to close just rotate 90 degree, so that it has advantage for the