In the pipeline system, the elbow is a pipe fitting that changes the direction of the pipeline. According to the angle, there are three most commonly used 45° and 90°180°. In addition, according to the needs of the project, it also includes other abnormal angles such as 60°. The materials of the elbows are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals, and plastics. The ways to connect with the pipe are direct welding (the most common way) flange connection, hot melt connection, electric fusion connection, screw connection, and socket connection. According to the production process, it can be divided into welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow, etc.

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