1.The fluid resistance is small, and its resistance coefficient is equal to the pipe segment of the same length. 

2.Simple structure, small size, light weight. 

3.Tight and reliable, and the ball valve sealing surface materials are widely used in plastic, good sealing, in the vacuum system has been widely used. 

4.Easy to operate, open and close quickly, from full open to all off as long as the rotation of 90 °, easy to control over long distances. 

5.Easy maintenance, ball valve structure is simple, sealing ring is generally active, disassembly and replacement are more convenient. 

6. Wide range of applications, diameter from small to a few millimeters, as large as a few meters, high vacuum or high pressure can be applied.