| General principles (O-Rings) | |||||||||||||
 The simple geometry is the main
characteristic of an O-Ring which, in conjunction with
proper elastomer selection results in a low cost, easy to
use and efficient sealing system.Elastomeric materials, when compressed, react like a high viscosity fluid which transmits applied stress in every direction; consequently, the O-Ring serves as a barrier, blocking the leak paths between the sealing surfaces. Technical sealing has been defined by DIN Standards as follows:
O-Rings offer several
advantages over other sealing systems: simplicity of
construction, standardized seal dimensions, wide
selection of materials, suitability for both static and
dynamic applications, standard dimensioning of glands,
low cost due to high volume manufacturing. |
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| The design
of an O-Ring application is based upon available
technical data and the experience of the specification
writer with regard to dimensions and available material
characteristics within a given environment or
application. O-Ring glands or grooves are normally cylindrical with flat and parallel faces.In high pressure applications, anti-extrusion devices (Back-Up Rings) are used to prevent extrusion of the elastomeric material through the clearance gaps when close tolerances are difficult to maintain. |
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The most
common international standards for O-Ring dimensions, in
addition to ISO 3601/1 are:
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