Functionalities of Mechanical Face Seals
Mechanical face seals consist of two geometrically identical metal seals and two elastomeric components, which are mounted into two separate housings. The elastomeric parts, as a secondary seal, take over the function of the clamping force of the spring, the static seal between the sliding ring and the work holder as well as the torque transmission. One of the two rings rotates with the shaft, while the counter sealing ring remains stationary. The plan lapped contact surfaces of both metal sealing rings are pressed against and axially slide on each other.
An essential functional feature of the mechanical face seal is a robust construction form, combined with very long lifecycles. The selection of the most suitable materials for the sliding ring and elastomer part ensure high wear resistance. Mechanical face seals guarantee a fully adequate corrosion protection, as well as optimum lubricant and temperature resistance. The materials used to make elastomeric O-rings assure minimal power loss over the life of the drive seal. Thus, this seal is technically superior to other types of construction.
Functionality in Adverse and Dirty Environments
As a result of permanent operations in adverse and dirty environments the sealed units and vehicles are exposed to extreme and constant strain. In all “Outdoor” implementations, such as coal-mining, open-cast mining, construction industry, agricultural- and forestry applications, chemistry, waste disposal and removal industries, water treatment, wind craft energy, offshore drilling etc. the following abrasive and corrosive media have to be taken into account, which standardized oil seals or rotary shaft seals cannot cope with:
- Sand, loam, mud, earth, stone, lime sandstone, granite, basalt
- Concrete, lime, potash, rubble, grit, slag, glass, asphalt, bitumen
- Chemicals, liquids, salts, lye, acids
- Sewage water, rainwater, harbor water, dirty water, sea water
- Secondary raw materials, liquid manure, metal scrap, metal recycling & disposal materials
Additionally, in combination to extreme weather conditions such as -55 °C/-131 °F to +200 °C/+392 °F and corrosive surroundings, e.g. maritime climate, the mechanical face seal solutions prove exceedingly reliable and functional in a wide range of applications.
Product and Functionality Advantages
Mechanical face seals prove themselves in application due to three outstanding advantages:
- Prevention of entry of abrasive dirt, contamination and media into the sealing space
- Avoidance of leakage (oil or grease escape) from the sealing space
- Extremely high wear resistance according to application
