The swing check valve, also known as one-way valve or non-return valve, its effect is to prevent medium backflow in the line. The valve that is opened or closed itself by the medium flow and force to prevent the backflow of the medium is called the check valve. Check valve belongs to automatic valve class, mainly used for directional flow of medium pipeline, only allow medium to flow in one direction to prevent accidents. These valves shall generally be installed horizontally in the pipeline.
This valve controls the opening and closing valve by turning the plate around a pivot above the valve seat. Open and close the valve by thrust from spontaneous flow of medium in the pipe.