Moulded lip seals

A moulded lip guarantees a better geometrical fit of the sealing lip by eliminating the machining tolerances on:

– the lip angle on the fluid side,
– the distance between the edge of the lip and the axis of the spring,
– the length of the lip (i.e. the distance between the fixing rim and the sealing edge).

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It avoids “irregularities” in the sealing ridge which could be caused by the machine tool.

Nowadays, the moulded lip has become a standard technique, thanks to:

– more accurate machining of the mould,
– suitable means of testing,
– improved vacuum moulding techniques.