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Centerline Butterfly Valve Structure

May 09,2022 Posted by Bundor

Industry News
The centerline butterfly valve adopts the centerline sealing structure, and the centerline of the disc seal of the butterfly valve is at the same position as the centerline of the valve body and the centerline of the rotation of the valve stem. The upper and lower ends of the disc close to the valve stem are designed as two smooth planes, and are in close contact with the valve seat gasket made of rubber to ensure that the medium does not leak from both ends; the outer edge of the disc is designed as a spherical outer edge, It should be ensured that the arc surface has a suitable surface roughness during processing, and the valve seat gasket should ensure that the sealing surface has a suitable surface roughness during molding. When the valve is closed, the butterfly plate rotates 0 to 90 degrees, and gradually compresses the valve seat gasket made of rubber, so that the elastic force formed by the elastic deformation of the valve seat gasket is used as the necessary sealing pressure to ensure the sealing of the valve. 

The centerline butterfly valve is usually used for water supply and drainage and gas pipelines with temperature ≤120℃ and nominal pressure ≤1.6MPa for food, medicine, chemical industry, petroleum, electric power, textile, papermaking, etc. to adjust flow and cut off fluid.
Advantages of centerline butterfly valve
  1. The channel is designed as a full-diameter structure, which ensures the flow area of the valve and reduces the flow resistance when the fluid passes through the valve.
  2. The disc is designed with a disc-shaped streamline, which can not only ensure the stress intensity in the center of the disc, but also ensure that the valve can obtain a larger flow coefficient and a smaller fluid resistance coefficient.
  3. The valve seat sealing ring is designed as a soft sealing structure of rubber and resin skeleton (fixed sleeve), which is embedded in the valve body after being made. The part of the inner ring higher than the inner cavity of the valve body adopts a streamlined design to achieve the purpose of reducing the flow resistance.
  4. The operating torque of the butterfly valve is small, the operation is convenient, labor-saving and smart.
  5. It can be installed in any position and easy to maintain.
  6. The seals can be replaced, and the sealing performance is reliable to achieve zero leakage of bidirectional sealing.
  7. Under normal temperature and pressure, the sealing material is resistant to aging and corrosion, and has a long service life.
Of course, the centerline sealing structure of the centerline butterfly valve also has shortcomings. It can only be made into a soft-sealing butterfly valve, which can only be used in a low-pressure and normal-temperature working environment, and is not suitable for high-temperature and high-pressure conditions.

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