The swing type check valve is also called a check valve , and its function is to prevent the medium in the pipeline from flowing backward. The valve of the opening and closing member is opened or closed by the flow of the medium and the force to prevent the back flow of the medium from being called a check valve. Check valves are automatic valves. They are mainly used on pipes with one-way flow of media. Only the media is allowed to flow in one direction to prevent accidents.The swing type check valve should be installed horizontally in the pipeline.