Spiral seals are used in many cutting-edge technology sectors, such as gas cooled reactor compressor seals, breeder reactor sodium pump seals, etc. Sometimes it is also used for high speed shaft sealing of reducer. Its advantage is that there is a large gap between the sealing pairs, and it can also effectively play a sealing role. If the design is reasonable, its service life can reach infinite. Because it can make a wide choice from the material and is extremely easy to manufacture, when the pressure difference is not large, the spiral seal power loss and heating are very small, and the cooling water jacket is enough to dissipate heat. Spiral seals often need to be supplemented by parking seals, which makes the structure complex and increases the size, so that the application is often limited. Spiral seal can be used for high temperature, deep cold, corrosion and liquid with particles, harsh sealing conditions, good sealing effect.