Commonly used self-sealing compression hydraulic seals, o-ring, round ring and square ring has a simple structure, easy to manufacture, low cost, etc., so they are widely used in the hydraulic drive system dynamic sealing components and static sealing. Install them in a sealed tank is usually 10-25% of the radial compressive deformation, and seal the surface of the higher to the initial contact stress, thereby preventing leakage of non-pressure liquid.

Hydraulic cylinders working pressure liquid extrusion self-styled compression type hydraulic seals, so that further deformation, and seal the surface with the pressure of the liquid pressure, strictly speaking, should be pressure. Increased and additional contact stress increased, and together with the initial contact stress to prevent the leakage of liquids under pressure. But when the pressure is greater than 10Mpa, in order to avoid the quality of self-styled synthetic rubber compression hydraulic part of the seal to squeeze into the sealing gap being cut off caused by leaks in the hydraulic cylinder reciprocating motion, must be the quality of the synthetic rubber self-sealing compress hydraulic seal the compression side setting the retaining ring of a synthetic resin such as nylon retaining ring, the POM retaining ring and filled PTFE retaining ring.

Synthetic rubber quality self-styled pressed hydraulic seals larger compression deformation, so the static frictional resistance is particularly large, usually more than twice its dynamic frictional resistance. Such a large static frictional resistance in a number of low pressure in the hydraulic system will inevitably result in low pressure crawling and operating difficulties and other negative phenomena, this is the self-sealing compression hydraulic seal small alone used as dynamic seals of reasons.

Lip type seals

At present, the ceramic factory hydraulic equipment hydraulic cylinder combination of hydraulic seals, o-ring and square ring, U-shaped ring, Y-ring, YX ring and other special shape of the hydraulic seals. superimposed using the composition of.

V-ring

V ring sealing performance, depending on the size of the working pressure to determine the number of seals are normally required the help of the gland adjustment to compensate for the amount of wear of the sealing ring, its Achilles heel is the complex structure is usually required to by the bearing rings, seals, and pressure ring is composed of three parts, the larger its frictional resistance and increases with increasing working pressure and seal number. V-ring is only suitable for low velocity and higher working pressure of hydraulic cylinder with.

U-ring

U-shaped sealing ring sealing performance, but used alone it is easy to roll, and therefore need the support ring supporting the tin bronze quality, its larger frictional resistance increasing with the increased work pressure. U-shaped ring is only suitable for the hydraulic cylinder of the lower working pressure or lower velocity.

Y-shaped ring

Y-shaped ring is to rely on its open lip close to the sealing surfaces remain sealed, and can usually be used alone, good sealing performance, less frictional resistance, good pressure resistance, good job stability and service life length. Y-ring is suitable for high-speed transformer, large bore, long stroke hydraulic cylinders.

YX ring

The YX ring is a section height and width ratio greater than 2 and the work of lip at the level of non-working lip Y-shaped ring, which is divided into the hole YX-ring and ring axis using YX, the sealing performance In addition to all the advantages of the Y-shaped ring, YX ring alone will never roll, further increasing its pressure and job stability. Therefore the YX ring is particularly suitable for the high pressure, high-speed transformation and rapid movement of the hydraulic cylinder.

The self-styled compact hydraulic seals: lip seal with self-sealing compression-shaped hydraulic seal the pieces of the same, according to their own deformation of the sealing surface to produce a higher initial contact stress and prevent pressure liquid leakage. Hydraulic cylinders working pressure liquid extrusion and softened the sealing lip, so close to the sealing surface and the additional contact stress increased the pressure of high pressure with liquid increased, and together with the initial contact stress to prevent pressure liquid leakage.



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