Add sealing points between the two flanges and fasten them with bolts. Flanges with different pressures have different thicknesses and use different bolts. Common standards of 20 # flange include national standard, American Standard, Japanese standard, German standard, British standard and French standard. It is mainly used in oil, natural gas, chemical industry, electric power, metallurgy, pharmaceutical, shipping, urban construction and other industries. In order to prevent rusting, the flange surface is usually provided with electroplated layer (yellow zinc, white zinc, etc.), or brushed with antirust oil and sprayed with antirust paint. 20 # flange production process includes forging, casting, medium plate rolling, medium plate cutting, etc. Among them, the forging price is the highest, the medium plate product is the second, and the casting product is the lowest. In terms of quality, forging is the best, rolling is the second, and casting is the third. However, the diameter of forgings is generally small
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