Slow closing check valve, also known as check valve, is used to prevent the medium in the pipeline from backflow. The opening and closing parts are opened or closed automatically by the force of medium flow to prevent medium backflow. The slow closing check valve belongs to the automatic valve category, which is mainly used on the pipeline with one-way flow of medium. The medium is only allowed to flow in one direction to prevent accidents. Slow closing check valve should be generally installed horizontally in the pipeline. By selecting different materials, it can be applied to water, steam, oil, nitric acid, acetic acid, strong oxidizing medium, urea and other media.