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Sealing principle of metal toothed composite gasket

Jul 15, 2020

When the flange connection is pre-tensioned, the soft material (flexible graphite or PTFE) covered on the two tooth surfaces of the metal toothed gasket even easily fills the uneven defects on the flange contact surface and is pressed in To many concentric circular tooth grooves on the surface of the metal core, the compressive stress during preloading increases the density of the covering material in the groove and on the tooth top (for example, the density of flexible graphite under 200Mpa compressive stress can be increased to close to 2.27g/cm3 or so).

When the average compressive stress during preloading is very low, the compressive stress of the flexible graphite at the top of the tooth will also be high, and it can still achieve a high density. In this way, multiple high-density seal rings with the same center are formed above the contact between the flange and the gasket. The state, coupled with the rebound effect of the metal core part, enables the gasket to withstand various deformation changes and maintain a good sealing effect.