The vacuum butterfly valve is mainly cut off on the pipeline.

The vacuum butterfly valve is mainly used for cutting and throttling on the pipeline. Butterfly valves are widely used in industries such as petroleum, chemical, city gas, urban heating, and water treatment. They are also suitable for the condensers of thermal power plants and the sealing pairs of butterfly valves for cooling water systems. Generally, rubber sealing materials such as rubber and plastic are used. Metal-to-metal sealing method.

With regard to the elastic seal, the seal ring can be embedded in the valve body passage or embedded in the periphery of the disc. When used as a plugging, its sealing performance is much better than that of the metal sealing pair, but the elastic sealing is subject to the temperature of the data.

Although the metal sealing pair can be used to a higher operating temperature, the lifespan is longer than that of a general elastic sealing butterfly valve, but it is difficult to seal, and therefore, it is generally used for saving.

2) The structure is simple and agile. The butterfly valve has fewer parts and the structure is relatively compact. When opening and closing, it is only necessary to rotate the butterfly plate by 90°.

3) Outstanding conditioning and sealing performance, can achieve grading manipulation flow, excellent conditioning performance. Because the elastic material such as rubber and plastic is selected as the sealing ring, the tightening and recovery performance are excellent, and the sealing performance is better. 4) The fluid resistance and the operating torque are small. According to the flow resistance experimental data of the butterfly valve, the flow resistance of the butterfly valve is smaller than other types of valves such as ball valves, plug valves, and slab gate valves. In addition, since the force of the butterfly plate is close to equilibrium when it is closed, the valve can be opened with a suitable small torque, so the operating torque is small. There are many varieties of butterfly valves. According to their structural characteristics and uses, they can generally be divided into the following two categories.