Advantages
Compared with the O-ring, the star-shaped seal ring has a smaller friction resistance and starting resistance because it forms a lubricating cavity between the sealing lips. Because its flash edge is located in the concave part of the cross section, the sealing effect is better. The non-circular cross section effectively avoids the rolling phenomenon during reciprocating motion.

Scope of application
The star-shaped seal ring has a wide range of applications. According to the temperature, pressure and medium, the technical parameters of the project reciprocating motion|rotating motion dynamic seal static seal should consider the mutual constraints between all working parameters. When determining the scope of application, it is necessary to consider the peak temperature, continuous speed (m/s) 0.5 2.0 working temperature and operating cycle. In rotating occasions, the temperature rise caused by friction heat must also be considered.

Mechanism of action The star-shaped seal ring is a self-tightening double-acting sealing element. The radial and axial forces depend on the pressure of the system. As the pressure rises, the compression deformation of the star-shaped seal ring will increase, and the total sealing force will increase, thus forming a reliable seal.

How to choose a star-shaped seal ring If the diameter of the shaft and hole is known, select the appropriate star-shaped seal ring according to the following criteria:

Static sealing or reciprocating linear motion: (1) Hole sealing: The inner diameter of the star-shaped ring should be compatible with the groove, or less than about 2% of the groove bottom diameter. Because the pre-compression force generated by pre-compression can effectively prevent the star-shaped seal ring from twisting and rolling. (2) Shaft sealing: The inner diameter of the star-shaped ring should be equal to or appropriately larger than the outer diameter of the shaft by about 0.2~0.3mm, or it can be about 1% larger than the outer diameter of the shaft. As a result, the seal ring will be easier to install and have a longer service life.

Rotary sealing: The inner diameter of the star-shaped ring should be about 2~5% larger than the diameter of the shaft it seals. Because the seal ring will generate friction and heat when used in a rotating motion, and the rubber will shrink when heated (Joule effect). Therefore, in order to ensure that the seal ring can be lubricated and work reliably, a star-shaped ring with an inner diameter larger than the shaft diameter must be selected. Usually, a seal ring with a smaller cross-section can meet the needs of static sealing. On the contrary, a larger cross-section seal should be selected to meet the dynamic seal. In the case of high pressure or large gap, a rubber material with higher hardness must be selected. The best way is to add a PTFE retaining ring to prevent high pressure extrusion damage.

Material: NBR, fluororubber, silicone rubber, fluorosilicone, perfluoroether, EPDM and other materials can be selected. Focus on quality, excellent material selection, can be customized according to customer needs