The American standard threaded vertical check valve disc is guided by the central axis at both ends of the inlet and outlet, which is flexible in opening and closing, accurate positioning, and can be installed horizontally or vertically. The disc is spring-loaded, and its fast closing can effectively reduce water hammer pressure. The sealing surface adopts a combined sealing structure of rubber elastic seal and metal hard seal, with good sealing performance and no noise when closed. It is widely used in cold and hot water, non-corrosive liquids and other media.
