American standard check valve stem selection

    The American standard check valve is composed of a valve body, a valve cover, a valve stem, a valve disc, a valve seat, etc. The quality of the valve stem has a great relationship with the service life of the product, because the valve opening and closing process Under the action of tension, compression and torsion, the valve stem is in direct contact with the medium, as well as the relative friction between them. Under the action of these, the valve stem may be worn, resulting in a decrease in the service life of the valve. Therefore, it must be guaranteed to have sufficient strength and toughness at a fixed temperature. Therefore, the valve stem should have excellent corrosion resistance and not easy to be rubbed. This requires its manufacturing process to be very good. Row.

    Commonly used materials for the stem of the American standard check valve include carbon steel, alloy steel, stainless acid-resistant steel, and heat-resistant steel. When carbon steel is used in low-pressure American standard check valves, stop valves, and water and steam media whose medium temperature does not exceed 300°C, A5 ordinary carbon steel is generally used. Alloy steel is used in medium pressure gate valves, high pressure stop valves, and high pressure stop valves. Stainless acid-resistant steel is mainly used for non-corrosive and weakly corrosive media with medium pressure and high pressure, and the temperature of the medium does not exceed 450 ℃. If it is used for corrosive media, choose another material. Heat-resistant steel is used for high temperature valves whose medium temperature does not exceed 600℃.