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Non-standard flanges are generally flanges designed by companies or individuals in order to save materials or use local materials.
Generally, non-standard flanges are designed to be smaller and thinner than national standard flanges to save materials. The form of the sealing surface can also be changed, such as sealing with a ring.
National standard flanges can be purchased in the market, while non-standard flanges must be designed and processed by yourself.
There are not many applicable occasions for non-standard flanges. For example, the working pressure of an equipment cylinder flange is only . If you think there is no need to use the national standard flange of . , you can design a small and thin non-standard flange yourself. , but you must consider that the cost of your own design and processing is less than the material cost you save.
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