Metallic seals are of vital importance in all kinds of valves for the best possible, safe conduct of processes. Processes must also be optimally controllable at extreme pressure and temperatures. The highest possible returns must be achieved in the generation of power.
Shaft seals are used in, among other things, compressors and engines where they ensure:
- controlled sealing
- lubrication during the operation of the compressor
The correct size of the shaft seal determines the effectiveness of its performance:
- the measurements of the piston rod must correspond exactly with the measurements of the seal
- the choice of the correct types of material determines the long-term faultless functioning of the compressor
- a correct choice of materials must restrict the wear process to a minimum in the most difficult and corrosive circumstances
These seals can be divided into 3 categories:
- Seals: these are rings where there is, in theory, no leakage. They consist of two rings which are cut in segments with an overlap of the segmenting to ensure a seal.
- Pressure release rings: rings with a controlled degree of leakage. This is usually a single ring with a slight opening at the segments or with a slight play on the shaft. (Both types ensure that the ring releases a controlled quantity of gas or liquid).
- Skim rings: Rings for skimming liquid from the shaft surface. A skim ring ensures that the contact with the shaft allows only a thin film of liquid to be formed as a result of the pressure between the ring and the shaft. The ring skims liquid from the shaft surface and leads this via radial grooves in the side of the ring to a feed out. Shaft seals can be obtained in an almost unlimited range of material types and in various models depending on the characteristics of the material. You can select the correct combination of type and material for the gasket from a wide range of rings.