‌ Nuclear power valve ‌ refers to the valves used in the nuclear island (NI), conventional Island (CI) and Station Auxiliary facility (BOP) systems in nuclear power plants. From the safety level, it is divided into nuclear safety level I, Level II, level III and non-nuclear level, of which nuclear safety level I has the highest requirements. Nuclear power valve is a large number of medium transmission control equipment used in nuclear power plants, and is an essential part of the safe operation of nuclear power plants ‌