Page 210 - Know and Understand Centrifugal Pumps

Mechanical Seals

1. Seal posterior (reference point for 5. Springs.
installation). 6. Rotary face.
2. Setscrew. 7. Stationary face.
3. Secondary dynamic seal ((0’ ring). 8. Anti rotation Pin.
4. Secondary static seal (10’ ring). 9. Secondary seals.
Figure 13-17

Advantages of the Cartridge Seal
Pre-assembled at the factory.

Reduced installation time.
Can be installed on most pumps without total pump disassembly.
Requires less technical expertise.
The mechanics don’t have to take complicated and confusing
installation dimensions with respect to spring tension and face
loading.
The mechanics can’t touch or contaminate the faces of the seal
during installation.
The installation costs less.
The cost of the seal is less as a total unit than the sum of the
individual parts.
Some cartridge seal models have accompanying re-build kits.
Most cartridge designs incorporate ports and hardware for
connecting environmental controls such as:
- Flush
- Quench and Drain