Introduction and classification of elbows<br> 1, the introduction of the elbow: In the pipeline system, the elbow is the pipe that changes the direction of the pipeline. <br> 2, elbow classification: <br> According to the angle, there are three most commonly used 45° and 90°180°, and other abnormal angle elbows such as 60° are also included according to engineering needs. According to the material, there are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics. According to the connection method, direct welding (the most common way) flange connection, hot melt connection, electrofusion connection, screw connection and socket connection. <br> The purpose of the elbow; that is, the object used when the pipe needs to turn, regardless of whether the pipe needs to travel in any direction, the elbow is used to change the direction<br>
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