is compared commonly used valve ball valve and butterfly valve. Some occasions can be common, but some operating mode is used only in one. Primary differences lies in the structure and principle of switch. Double valve manufacturer gives brief analysis:

a, ball valve, plug valve has evolved, open-close part is a sphere. Fluid resistance small, full size of the ball valve doesn't flow resistance. Construct a brief, small volume, light weight. Closely. It has two sealing surface, and now ball valve sealing surface material widely used in all kinds of plastic, good sealing, can accomplish completely sealed. Have been widely used in the vacuum system. Open and close operation is convenient, agile, from open to close just rotate it 90 & deg; To facilitate remote control. Convenient repair, ball valve structure brief, sealing ring are often activity, open convenient replacement are compared. In full open or full close, sphere and Industrial Valves seat sealing surface and the dielectric isolation, medium through, does not cause the valve sealing surface corrosion. Wide scale of application, size from small to several millimeters, big to a few meters, from high vacuum to high pressure can be used. Swab for ball valves in the process of opening and closing have sex, so can be used to bring in the medium of suspended solid particles.

2, butterfly: opening and closing a disc type is at the mercy of an open,

features are:

1, construct a brief, small volume, convenient device;

2, small flow resistance coefficient, quick opening and closing,;

3, can be used in large diameter valves;

4, can use different sealing surface, use all kinds of environments, including powder and granule medium;

5, convenient for opening and closing the agile, energy saving, fluid resistance small, can often operate.

6, can transport the mud, and the apertures accumulated liquid at least.

7, low pressure, can accomplish outstanding seal.

8, regulate performance is good.

three, summarizes the

butterfly valve relative to the ball valve, sealing is a bit poor, but in the large diameter valves, butterfly valves than ball valve has a unique advantage; As regulate traffic unavailable, butterfly valves regulate the scale is not big, and recuperated v-shaped ball valve, regulate accurately. Else, in high-pressure pipe, ball valve butterfly valve has the advantage.

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