Working principle and application of piston star seal ring

What are the working principles and applications of common piston star seals? The star seal ring is one of the most commonly used seals in hydraulic cylinders. It is a typical lip sealing ring. The cross section pressure distribution is uniform and the sealing effect is good. Therefore, the piston or hydraulic cylinder can obtain a good sealing effect. However, at low pressure, the U-shaped seal produces a seal thanks to excessive deformation of the lip.

As the contact surface is small, the friction is relatively low, the pressure rises, the elastic deformation of the seal ring lip also increases, the tensile, compression and bending stress increases, the axial pressure of the U-shaped seal ring automatically increases, and the contact length with the protrusion increases, until the entire shaft length of the U-shaped ring is in contact with the protrusion and the seal is well sealed.

The star seal ring is widely used, mainly for dynamic sealing. Quich Star Seal Double acting seal with elastic sealing capability, which is sealed by the accumulation of axial or radial contact stress and system pressure caused by precompression during initial installation. As the system pressure increases, the cumulative sealing force increases.

Under the influence of pressure, the star seal acts like a liquid with high interfacial tension. Pressure can be transferred symmetrically to each protruding surface. The radial stress required by the star seal ring is smaller than the O-ring, the friction is small, the service life is long, and the O-ring can be completely replaced, and the non-circular cross section prevents rolling.

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