knowledge,  sanitary butterfly valves

Development History of Butterfly Valve

Butterfly valve developing history

In the 1930s, the United States invented butterfly valves. This valve has a small operating torque, a small installation space and a light weight. Taking DN1000 as an example, the butterfly valve is about 2T, but the gate valve is as heavy as 3.5T. The butterfly valve is easy to combine with various driving devices, and has good durability and reliability.

The relationship between the opening of the butterfly valve and the flow rate changes substantially linearly. If used to control flow, its flow characteristics are also closely related to the flow resistance of the piping. For example, if the diameters, forms, etc. of the two pipe installation valves are all the same, but the pipe loss coefficient is different, the valve flow difference will be large.

The valve industry plays an important role in the development of the national economy as an important part of the equipment manufacturing industry.

Butterfly valve classification

Wafer butterfly valve

The wafer butterfly valve is simple in structure, small in size and light in weight. The butterfly valve has two types of sealing: elastic sealing and metal sealing. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.

Flanged butterfly valve

The flanged butterfly valve is a vertical plate structure, and the valve stem is a sealing ring of the integral metal hard sealing valve.
It is a composite structure of flexible graphite plate and stainless steel plate, which is installed on the valve body, and the sealing surface of the butterfly plate is welded with stainless steel. The seal of the soft-sealed valve is made of nitrile rubber and is mounted on the disc.

Welded butterfly valve

The welded butterfly valve is a non-closed butterfly valve, which is widely used in pipelines with a medium temperature of ≤300°C and a nominal pressure of 0.1Mpa in the production process of building materials, metallurgy, mining, electric power, etc., for connecting, opening and closing or adjusting the amount of medium.

Butterfly valve installation and maintenance

1. When installing, the valve flap should be stopped at the closed position.

2. The opening position should be determined according to the rotation angle of the disc.

3. Butterfly valve with bypass valve, open the bypass valve before opening.

4. It should be installed according to the installation instructions of the manufacturer. The heavy butterfly valve should be provided with a solid foundation.

The video below shows how to maintain the sanitary butterfly valve. For more information, please visit for more information.

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