Nuclear power plants use nuclear reactors to replace boilers in thermal power plants. Nuclear fuel is burned in a special form in the nuclear reactor to generate heat, which converts nuclear energy into thermal energy to heat water and produce steam. Steam enters through pipelines to drive steam turbine generators to generate electricity, which is then converted into electrical energy.

The main parts of nuclear power plant valves need to withstand various load forces under persistent or instantaneous pressure and temperature changes, and no obvious elastic-plastic deformation should occur. The medium transported by the primary loop system of the nuclear reactor is mostly radioactive and no leakage is allowed. Strict and effective measures must be taken in terms of structural design, seal selection, material and quality inspection and control. The service life must be very long and safe and reliable.