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3. Controlled leak tightness
Rotational movement is used to create special seals that are only effective when moving. Such dynamic systems must be backed up by a static seal.
3.1 Smooth ring seal (with fixed ring)
Fixed-ring annular seals (figure 5 ) operate on the principle of throttling action provided by a long annular gap with a relatively small clearance of the order of a few tens to a few hundreds of microns. Since their efficiency is directly related to the viscosity of the fluid, this type of seal is suitable for liquids, and in particular for applications where some leakage can be tolerated.
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Controlled leak tightness
Relative tightness
Bibliography
Standards
- Mechanical seals – Main dimensions, designations and material codes. - NF EN 12756 - Avril 2001
- Bagues d'étanchéité à lèvres pour arbres tournants incorporant des éléments d'étanchéité en élastomère. Partie 1 : dimensions nominales et tolérances. - ISO 6194-1 - 2007
- Lip seal rings for rotating shafts incorporating elastomer sealing elements – Part 2: vocabulary. - NF ISO 6194-2 - 2009
- Geometric product specification...
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