1. Divide by material: carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon alloy, PPC, etc.
2. According to the production method, it can be divided into pushing, pressing, forging, casting, etc.
3. According to manufacturing standards, it can be divided into national standard, electric standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc.
4. It can be divided according to its true radius of curvature: it can be divided into long radius elbow and short radius elbow. Long radius elbow refers to its radius of curvature equal to 1.5 times the outer diameter of the pipe, that is, R=1.5D. A short radius elbow means that its true radius of curvature is equal to the outer diameter of the pipe, that is, R=1.0D (D is the straightness of the elbow, R is the true radius of curvature).
5. If divided by pressure level: there are about seventeen types, which are the same as the American pipe standards: Sch5, Sch10s, Sch10, STD, Sch60, Sch80s, Sch100, Sch120, Sch140, Sch160, XXS, among which the most Commonly used STD, XXS.
