The ball valve and the butterfly valve are the comparison common valve. Some occasions can be universal, and some conditions can only be used in one way. The difference between the two is mainly the structure and the switch principle.

One, ball valve: plug valve evolved, the headstock is a sphere. Features are:

1. The fluid resistance is small, the whole diameter ball valve has no flow resistance at all.

2. Simple structure, small size, light weight.

3. Tight and secure. It has two sealing surface, and now the ball valve sealing surface information widely used a variety of plastic, good sealing, can complete the complete seal. In the vacuum system has also been widely used.

4. Convenient operation, open and close, from open to full off as long as 90 °, easy to control long-distance.

5. Easy to repair, the ball valve structure is simple, sealing ring is usually active, the replacement is convenient to disassemble.

6. In open or full closed, the ball and valve seat sealing surface and media isolation, the media through, will not cause the valve seal surface corrosion.

7. Wide range of applications, ranging from small to several millimeters, to a few meters, from high vacuum to high pressure can be used.

8. Because the ball valve in the opening and closing process has scrub, so can be used with suspended solids particles in the medium.

Second, butterfly valve: The opening and closing parts are disc-style open, characterized by:

1. Simple structure, small volume, convenient installation;

2, the flow resistance coefficient is small, the opening and closing agile,;

3, can be used for large-caliber valves;

4, can use different sealing surface, use a variety of environment, including powder, granular media;

5, opening and closing convenient agility, labor-saving, fluid resistance is small, can often operate.

6, the ability to transport mud, at the mouth of the pipeline to accumulate liquid at least.

7, under the low pressure, can complete the outstanding seal.

8, good conditioning performance.

At Last

Butterfly valve relative to the ball valve, the seal is slightly worse, but the large diameter valve, butterfly valve than the ball valve to have a unique advantage; As the conditioning flow, butterfly valve conditioning scale is not small, and V-type conditioning ball valve, conditioning accurate. In other, in the high-pressure pipeline, the ball valve has the superiority than the butterfly valve.