U2 are used to seal the knots of reciprocating motion higher dynamic working conditions than rings U1. They do not require supporting rings. The geometry of the U2 seal is based on short and thick lips provide high of size contact pressures or the high value of the pressure in the throttle slot. Pressure of ring lips to the sealing surface increases with the increase of self-pressure medium. There is no risk of damaging the surface due to galling, because the configuration of the grove ring lips allows lubrication of gap, even at high pressure which allows the use of U2 in wide range of pressures.

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