Swing check valves, also known as check valves or check valves, are used to prevent the backflow of media in the pipeline. The opening and closing parts rely on the flow and force of the medium to open or close by themselves, so as to prevent the medium from flowing backwards. Check valves belong to the automatic valve category, which are mainly used on pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents. This type of valve should generally be installed horizontally in the pipeline.