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A forged steel check valve is a type of check valve; it is a valve that opens and closes its valve disc automatically due to the flow of the medium itself, and is used to prevent backflow of the medium. It is also known as a non-return valve, one-way valve, reverse flow valve, and backpressure valve. A check valve is a type of automatic valve whose main function is to prevent the backflow of fluid, stop the pump and driving motor from rotating in reverse, and prevent the leakage of fluid from containers. Forged steel check valves are typically suitable for small-diameter valves and high-pressure applications. Forged steel check valves come in three different designs for the valve cover: The first is the bolted valve cover design, in which the valve body and the valve cover are connected using bolts and nuts, with spiral gaskets (made of 316 stainless steel combined with flexible graphite) serving as the sealing element. Metal rings can also be used for connection when the customer has specific requirements. The second design type is the welded bonnet valve; for valves of this design, the valve body and the bonnet are connected by threads, achieving a fully welded seal. Weld-through connection can also be used if the customer has special requirements. The third type is the self-sealing valve cover. In valves designed with this approach, the valve body and the valve cover are connected by threads, with an internal pressure-driven sealing ring providing sealing. The advantage is that the higher the internal pressure, the better the sealing performance. Standards for forged steel check valves: Design and manufacture in accordance with API602 and ASME B16.34; inspection and testing per API598; marking in accordance with MSS-SP-25. Socket ends comply with ASME B16.11 and JIS B2306; threaded connections (NPT) comply with ANSI/ASME B1.20.1, BS21, ISO 7/1, and JIS B0203