1) The structural features of butterfly valve Butterfly valve is equivalent to cut off a section of the valve body, the middle of the throttle plate. Its outstanding features are as follows: (1) The valve is roughly divided into ordinary butterfly valve, oval butterfly valve and high-performance butterfly valve. (2) With small size, light weight, especially adapted to large diameter occasions. (3) has a better logarithmic flow characteristics, good performance. Because of its valve body and valve seat function, can make good use of throttling erosion effectively flushing the valve body wall, but also bring better "self-cleaning" performance. (4) The most suitable for large diameter, high flow, low pressure, clean media occasions. With the strengthening of process parameters, the caliber increases, the application of the butterfly valve will be more and more widely. 2) The use of butterfly valve Butterfly valve has the advantages of light weight, small size, anti-blocking, the disadvantage is that the leak, can only be used for small pressure occasions. In order to reduce the amount of leakage, there will be an elliptical butterfly valve, butterfly valve leakage than the ordinary reduced by 3 to 5 times above, in order to meet the weight of light, small size, and leakage is small, it is recommended full use of ultra-light control valve Or spherical sealing butterfly valve and other high-performance butterfly valve, leak up to 10-5 ~ zero leakage. As early as the 1950s and 1960s, butterfly valve throttling piece rubber for corrosion-resistant applications, but rubber lining butterfly valve is not corrosion or poor reliability, has already been eliminated, and replaced by fluorine anti-blocking cut off butterfly valve, which has resistance Corrosion, blocking, cutting off, light weight, small size and other advantages, for a wider range of applications, the valve has been the national patent.
