Mechanical Seals can be classified as follows according to their applications:

1. Mechanical seals for pumps: single stage centrifugal pumps, mutiple stage centrifugal pumps, water pumps,waste water pumps, oil pumps,swimming-pool pumps, mining pumps, fire hydraulic pumps, screw pumps, household water pumps, seawater pumps, vortex pumps,etc.

2. Mechanical seals for engine cooling water pumps including automotive cooling water pumps, tractor cooling water pumps, etc.

3. Mechanical seals for ships including cargo ships, aircraft carriers and battleships,etc.

4. Mechanical seals for refrigerators or freezers including screw refrigerators and centrifugal freezers

5. Mechanical seals for submersible engines in water or oils

6. Mechanical seal for ventilators and air-blowers

Mechanical seals can also classified as follows: industrial pump mechanical seals, chemical pump mechanical seal, household pump mechanical seals.