زانویی 45 درجه
Therefore, it is very important in the pipeline. The main function of the elbow is to change the direction of the pipeline. All pipelines can not go all the way to the end, so the elbow is needed to turn. The most commonly used are 90° elbow, 45° elbow, 180° elbow, and special angle elbow, or long elbow, big elbow, etc.