1. Fluid resistance is small, the resistance coefficient of fish length loudness equal to the pipeline;
2. Simple structure, small size, light weight;
3. Tight and reliable, good sealing, the vacuum system is also widely used;
4. Easy to operate, switch quickly, easy to control;
5. Easy maintenance, ball valve structure is simple, easy replacement demolition;
6. In the fully open or fully closed, the sealing material and media isolation, media will not cause erosion of the sealing material.