Dry gas seal is a non-contact sealing type, characterized by low sealing power consumption, which is only about 5% of that of contact mechanical seals; Compared with other non-contact seals, dry gas seals have less gas leakage; In a centrifugal compressor, using its own process gas as the sealing gas has no adverse impact on the process flow; It can achieve zero escape of the medium and is an environmentally friendly seal; The sealing auxiliary system is simple and reliable, and requires no maintenance during use.

The performance of dry gas seals is mainly reflected in the contradiction between the stability (or service life) of seal operation and seal leakage. The direct factor affecting the leakage of dry gas seals is the film thickness of the dry gas seal, which is the working gap formed between the sealing surfaces during the operation of the dry gas seal.

The new technology of dry gas sealing has solved this problem and provided strong guarantee for the stable, long-term, and full load operation of the device. It also indicates that adopting new technologies and processes is an effective way to solve the operational problems of the device. The sealing end face of the dry gas seal has almost no wear during operation, only minimal wear during startup and shutdown. Once particulate impurities enter the sealing chamber, the pressure groove root on the sealing surface is easily worn. Therefore, the gas used for sealing should be clean and free from particulate impurities.