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Power station check valve, also known as check valve or check valve, its main function is to prevent the backflow of media in the pipeline to ensure the safe operation of the system. The check valve automatically opens or closes by the force of the flow of the medium itself, which is a kind of automatic valve. They are widely used in power plant systems, especially for preventing the steam or water in the steam pipe and heater from flowing back to the turbine when the load is suddenly dumped, so as to avoid damage to the blades and ensure the safety of power plant equipment.

Check valves are available in various types, including lift, swing, butterfly and diaphragm. The structure of the lift check valve is usually similar to that of the globe valve, and the valve disc moves up and down along the center line of the channel, which is suitable for light and small diameter occasions. The flap of the swing check valve rotates around the rotating shaft and is suitable for large diameter pipelines, and its fluid resistance is less than that of the lift check valve.

The design and manufacture standards of power station check valves usually follow ANSI, API 6D, ASME B16.34, etc., ensuring their reliability and safety in harsh environments such as high temperature, high pressure, and corrosive media. Disc and seat sealing surfaces may be surfacing with cobalt-based cemented carbide to improve wear resistance, high temperature resistance and abrasion resistance, thereby extending service life.

In addition, some power station check valves are specially designed to reduce or eliminate the phenomenon of water hammer, which is a high pressure fluctuation caused by a pressure shock wave when fluid flow suddenly stops, which can cause damage to the piping system. The Silent Check Valve controls the closure of the disc through a specially designed spring mechanism to prevent water hammer from occurring.

When selecting the power station check valve, it is necessary to consider its nominal pressure, operating temperature, applicable media and other factors to ensure that the valve can provide effective check function under specific working conditions. For example, the welded check valve is suitable for systems with nominal pressure PN20.0 ~ 32.0MPa and operating temperature not exceeding 540℃.

In general, the power station check valve is an indispensable component to ensure the safety of the power station system, and its correct selection and installation are crucial to prevent equipment damage and ensure the stable operation of the system.以上翻译结果来自有道神经网络翻译（YNMT）· 通用场景