Nuclear power valves are valves used in nuclear power plants in nuclear island NI, conventional island CI, and power plant auxiliary facility BOP systems. From the security level, it is divided into nuclear safety level I, level II, level III, and non-core level. Among them, nuclear safety class I has the highest requirements. Nuclear power valves are used in nuclear power plants with a large number of medium conveying control equipment, which is an indispensable and important part of the safe operation of nuclear power plants.

In nuclear power plant equipment, although the valve is only an accessory, its role can not be ignored, because the valve plays an extremely important role in the normal, safe and reliable operation of the nuclear power plant.

A pressurized water reactor type nuclear power plant equipped with two sets of millions of kilowatt units is a relatively common and reasonable configuration. It consists of Nuclear Island, Conventional Island and Power Plant Auxiliary Facilities BOP (Balance of Plant). Three parts, of which the nuclear island NI includes the nuclear steam supply system NSSS (Nuclear Steam Supply System) and the nuclear island auxiliary facility BNI (Balance of Nuclear Island). NI is the core of a nuclear power plant, where nuclear energy is converted into heat and a large amount of steam is produced to provide electricity.

The most representative technical parameters in nuclear power valves are:

Maximum diameter: 1200mm butterfly valve of nuclear grade 3; 800mm of main steam isolation valve of nuclear grade 2; 350mm of main circuit gate valve of nuclear grade 1.

Maximum pressure: about Class 1500 LB.

Maximum temperature: about 350℃

Medium: coolant(boated water), etc.