Types:

There are two different types of Mechanical Face Seals: the most common form is Type DO, which is characterized by the use of an ORing as the secondary sealing element.

Type DF, on the other hand, has an elastomer with a diamond-shaped cross section as a secondary sealing element instead of the ORing.

Both types consist of two identical metal seal rings which seal against each other on a lapped seal face.

Technical data for metal seal rings :

Material: High-alloy, Corrosion-Resistant Cast Iron

Process: Cast

Hardness: HRC 65 To 72

Life time: More than 4000 hours

Peripheral speed: <= 3m/s

Corrosion Resistance: High

Scoring Resistance: High

Technical Data for O-Ring:

Material: NBR

Hardness: 60-65 Shore A

Temperature range: -20 °C to +100 °C

Advantages:
- Simple, reliable design
- High sealing effect against dirt, dust, water and abrasive media from the outside and against oil and grease from the inside
- Cost-effective
- Long service life
- Self-centering to compensate for shaft eccentricity or misalignment
- Maintenance-free
- Easy to assemble

Applications:
Mechanical Face Seals are predominantly used for sealing the bearings in construction machinery or production plants operating under extreme arduous conditions and subject to severe wear.
These include:
- Tracked vehicles, such as excavators and bulldozers
- Conveyor systems
- Heavy trucks
- Axles
- Tunnel boring machines
- Agriculture machines
- Mining machines
Mechanical Face Seals are proven in general machine engineering for gearboxes, mixers, stirrers, wind-driven power stations and other applications with similar conditions or where maintenance-free lifetime time sealing is expected.