1.The manufacturing standards can be divided into national standards, electrical standards, ship standards, chemical standards, water standards, American standards, German standards, Japanese standards, Russian standards, etc.
2. It can be divided into long radius elbow and short radius elbow according to its curvature radius. Long radius elbow refers to the outer diameter of the pipe whose curvature radius is equal to 1.5 times, that is, R=1.5D; Short radius elbow means that its radius of curvature is equal to the outer diameter of the pipe, that is, R=1.0D. (D is the elbow diameter, R is the radius of curvature).
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