Sewers play a vital role in urban sewage discharge. In cities, we usually regard these pipes as straight pipes, even if they pass through squares, halls or city squares. But in fact, sewers turn in some places for different reasons.

First of all, the turn of the sewer can reduce the speed of water flow and prevent the substances in the pipeline from moving along the pipeline. By changing the direction and angle of the pipeline, the speed of water flow in the pipeline can be controlled, and rotten substances and dust can be prevented from accumulating in the pipeline. This is also helpful to reduce the water flow of single-width pipeline, so as to better avoid the blockage of drainage pipes and poor water flow.

Secondly, in the installation and construction of sewer materials, it should be considered that roads, buildings and other land make the pipeline inclined and cannot be directly branched. The elbow structure can be used to shorten the pipeline and avoid roadblocks. This structure can not only make better use of the limited space, but also reduce the length of the pipeline, thus reducing the amount of materials.

In addition, in the drainage system, when the sewer is connected horizontally, the flow speed will also increase. By lowering the speed or installing the elbow directly from above, the pipeline can be protected by reducing the water flow speed.

To sum up, the sewer elbow is not only an indispensable part of the drainage system, but also the design of the elbow helps to keep the water flow stable and effective, avoid blockage and make full use of the pipeline space.