Mechanical Seals

To obtain the desired sealing function and an adequate lifetime of the mechanical seal,the preconditions must be fulfilled within the permitted tolerances at any time:

parallelism of the sealing surfaces
perpendicularity of the seal faces to the rotation axis
elastic contact of the sealing surfaces
existence of a lubricating film between the two sealing surfaces

Usually the sealing capability of the mechanical seal against shaft or housing is obtained with the secondary seals, as O-rings, bellows or boots

In conjunction with the International Organization for Standardization (ISO) and their standards (ISO 3069), the German Industrial Standard (DIN) published proposals for standard mechanical seals with DIN EN 12756 (24960).

These proposals relate to the sealing rooms, main dimensions, designation and material codes.