Types of Mechanical Seal 

Mechanical Seal is used to control rotating shaft leakage. There are following main types;
Balanced Mechanical Seals
Unbalanced Mechanical Seals
Pusher Type Mechanical Seals
Non Pusher Type Mechanical Seal
Bellow Type Mechanical Seals
Cartridge Type Mechanical Seals
This video covers following;
Single Spring Mechanical Seal
Multi Spring Mechanical Seal
Conical Spring Mechanical Seal
Metal Bellow Mechanical Seal
Teflon Bellow Mechanical Seal
Cartridge Type Mechanical Seal
Applications of different types of mechanical seals are as under;
Balanced mechanical seals are particularly suited to higher operating pressures, typically above 200 PSIG. They are also a good choice when handling liquids with low lubricity and higher volatility.
Unbalanced mechanical seal types are commonly employed as a more economical option to the more complex balance seal. Unbalanced seals may also exhibit less product leakage due to tighter control of the face film, but as a result can exhibit much lower mean time between failure. Unbalanced seals are not recommended for high pressure or most hydrocarbon.
Pusher seals utilize one or multiple springs to maintain seal closing forces. The springs can be in the rotating or stationary element of the mechanical seal. Pusher type seals can provide sealing at very high pressures but have a drawback due to the elastomer under the primary seal face that can be subjected to wear as the face moves along the shaft/sleeve during operation.
Non-pusher seals utilize a metal or elastomeric bellows to maintain seal closing forces. These seals are ideally suited to dirty and high temperature applications.
Bellows seals are limited to medium/lower applications.
Cartridge type mechanical seals incorporate all of the seal elements into a single assembly. This dramatically reduces the potential for assembly error and the time require for seal replacement .
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