What are the types of graphite gaskets with better mechanical seal performance and structure-

What are the types of graphite gaskets with better mechanical seal performance and structure

　2016-12-26　　

Several types of graphite gaskets with better mechanical seal performance and structure are:

①LattygrefReflex, a pure graphite gasket strengthened by the Jinli ring, originated from a gasket specially developed for nuclear power plants in France. The working principle of this type of gasket is based on the fact that the metal between the flange and the gasket must be kept in contact with each other under any conditions. Therefore, the graphite height (volume), the surface roughness of the metal, and the specific pressure of the gasket must be carefully calculated during the design. (Related to graphite density, fluid pressure, temperature, flange, etc.). The gasket has the advantages of lower compression load, large resilience, good reproducibility, insensitivity to pressure and temperature fluctuations, and better sealing performance than metal wound gaskets under the same conditions.

② Graphite gaskets reinforced with gold foil used adhesives to bond graphite to metal. Now there is a process of directly bonding with metal foil without adhesive, so that this gasket can withstand higher temperatures (except for metal plates that are not resistant to high temperatures)

③The design of traditional spiral wound gasket is based on applying sufficient load to compress the gasket to its optimal thickness. However, for flanges with lower pressure levels, the gasket stress is affected by the small size, quantity, and method. Due to the limitation of the stiffness of the Lan itself, it is difficult to meet this requirement. Therefore, Cary Briggs and Antoine Scrran proposed a new concept of low force sealing-LS gasket. LS is based on modifying the traditional winding gasket, so that only the graphite and the flange sealing surface are in contact at the initial compression stage, so as to allow the optimal compression thickness to be achieved under lower bolt stress, so the preload is reduced (about one-half) The sealing performance is improved (a difference of 丨 orders of magnitude), and the reliability is also increased (withstanding high temperature without leakage).　　214.html,

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