Author: Site Editor Publish Time: 2018-12-14 Origin: Site
Further improved molding on the basis of the single offset butterfly valve is currently the most widely used double offset butterfly valve. The structural feature is that the stem axis is offset from the center of the disc and from the center of the body.
l What are the advantages of the double eccentric butterfly valve?
l What is the difference compared to the centerline butterfly valve?
l Structural features
Double eccentric butterfly valve is also called high performance butterfly valve. It is mainly used for system drainage of water plants, power plants, steel mill smelting, chemical industry, water source project, environmental facilities construction, etc. It is especially suitable for waterway pipelines and is used as regulation and interception equipment. Compared with the midline butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, longer life and good stability.
The double offset effect allows the disc to be quickly disengaged from the valve seat after the valves are opened, which greatly eliminates unnecessary over-squeezing and scraping of the disc and the valve seat, reduces the opening resistance, reduces wear and improves the seat life.
The butterfly valve and the upper and lower valve shafts are connected by a special-shaped hole and a special-shaped shaft. During the opening and closing process of the butterfly plate, the function of the pin-free connection of the upper and lower sides of the butterfly plate is realized, and the interference zone between the butterfly plate and the valve seat is reduced. This greatly reduces the torque. The floating structure of the disc realizes the single offset manufacturing process and the function of eccentricity.An anti-butter plate over-stop is provided in the inner cavity of the valve body to ensure that the disc is not in place when it is closed.
The bushing between the upper and lower valve shaft holes of the valve body cavity and the lower shaft of the butterfly plate is protected by a bushing to prevent large particles in the medium from entering the valve shaft hole.
Compared with the centerline butterfly valve, the double offset butterfly valve is more resistant to high pressure, longer life and good stability.
The double offset butterfly valve is further improved on the basis of a single offset butterfly valve. The structural feature is that the stem axis is offset from the center of the disc and from the center of the body. The scraping is greatly reduced, and the double offset butterfly valve can also be used with a metal valve seat, which improves the application of the butterfly valve in the high temperature field.
1 Reasonable design, compact structure, easy assembly and disassembly, easy to repair.
2 The offset structure is used to reduce the friction of the sealing ring and prolong the service life of the valve.
3 Completely sealed with zero leakage. Can be used in ultra-high vacuum conditions
4 Replace the valve plate seal, disc, shaft and other materials, can be applied to a variety of media and different temperatures
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