Swing check valve, also known as one-way valve or check valve, its role is to prevent the backflow of media in the pipeline. The opening and closing parts are opened or closed by themselves by the flow and force of the medium to prevent the medium from flowing backward. The valve is called a check valve. Check valves belong to automatic valves, mainly used for one-way flow of media on the pipeline, only allowing the flow of media in one direction to prevent accidents. This type of valves should be installed horizontally in pipes.