How to choose flanged concentric butterfly valve?
Flanged butterfly valves are mainly used in industrial production pipelines. Its main function is to cut off the flow of medium in the pipeline, or to adjust the flow of medium in the pipeline. Flanged butterfly valves are widely used in production pipelines in general industries such as water conservancy projects, water treatment, petroleum, chemical industry, and urban heating, and can also be used in condensers and cooling water systems of thermal power stations.
Flanged butterfly valves are especially suitable for making large-diameter valves. They are widely used in the field of large-diameter regulation. When the flanged butterfly valve is fully opened, the flow resistance is small. When the butterfly plate is opened at an angle of about 15-70° When the flanged butterfly valve can control the medium flow very sensitively.
In addition, because the butterfly plate of the flanged butterfly valve has wiping properties when rotating, this type of valve can be used in pipelines with suspended particle media. According to the strength of the seal, it can also be used for powder Shaped and granular medium pipeline.
Classification of flanged butterfly valves
Flange butterfly valves can be divided into soft seal flange butterfly valves and hard seal flange butterfly valves according to the material of the sealing surface.
The sealing pair of the soft-sealing flanged butterfly valve is made of elastic sealing materials such as rubber and fluoroplastics; the sealing of the hard-sealed flanged butterfly valve is made of metal-to-metal, metal-to-fluoroplastic and multi-layer composite board.
The sealing ring of the soft-sealed flanged butterfly valve can be inlaid in the valve body passage, and can be inlaid around the butterfly plate. When it is used as a shut-off valve, its sealing performance can reach FCI70-2:2006 (ASME B16 104) VI The level is much higher than that of the hard-sealed flanged butterfly valve; but because the soft-sealed material is limited by the operating temperature, the soft-sealed flanged butterfly valve is usually used in the field of water conservancy and water treatment at room temperature.
The metal hard seal flange butterfly valve has the advantages of materials, can adapt to higher working temperature, higher working pressure, and has a longer service life than the soft seal, but the disadvantages of the hard seal flange butterfly valve are also obvious. It is difficult to achieve complete sealing, and the sealing performance is very poor, so this type of flanged butterfly valve is generally used in occasions that do not require high sealing performance to regulate flow.
Post time: Apr-10-2023
