Ball valve and gate valve are belong to one type of valve, the difference in the closing of the ball valve is a ball, the ball around the valve core wire for rotation to achieve a kind of open and close the valve.Ball valve in the line is mainly used for cutting, distribution, and change the flow direction of medium.Flanged ball valves standard GB/T21465-2008 "valve terms" are defined as opening and closing (sphere) by stem drive, then make rotation movement around the axis of the stem of the valve.
Ball valve is widely used in recent years a new type of valve, it has the 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 of ball valve, sealing ring, which generally remove replacement is more convenient.
6. In the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, medium through, can not cause the valve sealing surface erosion.
7. Applicable scope is wide, size from small to several millimeters, big to a few meters, from high vacuum to high pressure can be applied.This valve shall generally be installed in the pipeli