Mechanical seals have the purpose of preventing leakage of a fluid (liquid or gaseous) through the clearance between a shaft and the fluid container.
The main components of a mechanical seal are the seal rings on which a mechanical force is acting, generated by spring or bellows, and a hydraulic force, generated by the process fluid pressure.
The seal ring which rotates with the shaft is called the “rotary ring”; the seal ring fixed on the casing of the machinery is called “stationary ring”.
rotary rings and shafts and also between stationary rings and the casing of the machinery, Elastomeric 0-rings are usually used as secondary seals bbt alternative systems can be used.