The star ring is the most commonly used seal in hydraulic cylinders, and it is a typical lip seal. Compared with the O-ring, the star-shaped seal is equivalent to an improved or upgraded version of the O-ring, except for the different bearing surfaces.
The star ring can completely replace the O-ring, and the non-circular section avoids rolling in the reciprocating motion. It is improved and improved on the basis of the performance of the O-ring, and its standard size is completely the same as that of the American AS568 standard O-ring.