In the 1930s, the United States invented the butterfly valve. It was introduced to Japan in the 1950s. It was generally adopted in Japan in the 1960s, and promotion in China was after the 1970s. Low operating torque, small installation space and light weight. Taking DN1000 as an example, the butterfly valve is about 2T and the gate valve is about 3.5T. The butterfly valve is easy to be combined with various driving devices and has good durability and reliability.
The disadvantage of the rubber seal butterfly valve is that if it is used for throttling, cavitation may occur due to improper use, and the rubber seat may peel off or be damaged. 80-90 years for this metal. However, how to use it correctly must be based on working conditions.
The relationship between the opening and the flow of the butterfly valve is basically a linear proportional change. If it is used to control the flow, its flow characteristics are also closely related to the flow resistance of the piping. If the diameters and forms of the two pipeline installation valves are the same, and the pipeline loss coefficient is different, the flow rate difference of the valves will also be very large.
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