Worm gear ball valve position according to the channel can be divided into straight-through, three general formula and right Angle type.Two kinds of ball valves for distribution after the medium and change the flow of medium.Ball valve installation and maintenance should be paid attention to the following: 

1. To leave the position of the valve handle rotation.

2. Cannot be used for throttling.

3 belt drive mechanism of ball valve should be installed upright.The working principle of ball valve is love by rotary valve to keep the valve open or occlusion.Ball valve switch lightweight, small size, can make it big caliber, reliable sealing, simple structure, convenient maintenance, sealing surface and the spherical often in the closed state, not easily be medium erosion, has been widely used in various industries.Worm gear ball valve in the line is mainly used for cutting, distribution, and change the flow direction of medium.

    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.Ball rotated 90 degrees in the inlet and outlet should be completely present spherical, thereby blocking flow.

Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve