Läpptätning

Läpptätning is a Swedish term that translates to lip sealing or lip closure. In a technical context, it refers to a sealing mechanism that relies on the deformation of a flexible lip or flange to create a seal against a mating surface. This type of seal is commonly found in various mechanical applications, such as in fluid power systems, pumps, and valves.

The principle behind läpptätning involves a component with a thin, elastic lip that is pressed against a shaft or a bore. The pressure of the fluid or gas being contained, or sometimes a mechanical preload, causes the lip to deform and conform tightly to the surface, thereby preventing leakage. The effectiveness of a läpptätning depends on factors like the material properties of the lip, the geometry of the sealing element, and the surface finish of the mating part.

Common materials used for läpptätningar include various elastomers like rubber, polyurethane, and PTFE, chosen for their flexibility, resilience, and resistance to the media being sealed. The design can vary, with single-lip and double-lip configurations being prevalent. Double-lip seals often provide enhanced sealing performance and can also offer dust or dirt exclusion capabilities. Läpptätningar are valued for their simplicity, relatively low cost, and effective sealing under moderate pressure conditions.