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Seals are devices used to join sections of a machine to prevent leakage fluid or water to the external environment. They are installed on power transmitting shafts or rotating devices to improve machine efficiency, environmental contamination, and machine safety. The main technology used in making seals is tribology (friction, lubrication, and wear) that helps to control the surfaces on the points where rotating rings rub against each other. They not only help prevent the liquid or gas that is handled by the machine from leaking but also improve the overall machine efficiency. Therefore, the seals you use in a device should be highly effective. Here are the main types of seals: 1. The pusher mechanical seals: These seals move axially along a rotating shaft of sheave to help maintain contact with the seals faces. The seals are very helpful in compensating for wear that occurs at the surface and wobbling from misalignment. 2. Unbalanced mechanical seals: These types of seals are mainly used under conditions where shaft misalignment, vibrations, and cavitation of fluid are major issues. Note that the seals are recommended for operations under low pressure. 3. The non-pusher mechanical seals: As the name suggests, these seals do not require being moved axially to maintain contacts. They are designed to operate on low temperatures and high-pressure conditions. To use the seals, it is advisable to upgrade the bellows so that they can run effectively even in corrosive conditions. 4. The balanced mechanical seals: These seals are designed to sustain high pressure across the faces and generating less heat. Therefore, they can be used for handling liquids with low lubricating capacities. 5. Cartridge mechanical seals: The primary benefit of this group of seals is that they are simple and do not need complicated setting during installation. This means that they are less prone to errors during setup.