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 Flange connections are generally used for pipes and equipment, valves, pipe connections. For the chemical industry require constant maintenance to replace pipes and dust, slurry pipelines, steel-plastic composite pipe, rubber lined steel pipe flange connection can be applied. Sealed between the flange gasket with bolt fastening. See flange connection diagram. Flange according to the pressure transmission medium, type and pipe material selection, often there are flat welding steel flange, welded steel flanges, loose flanges and plastic sets of steel flange and so on. Flange sealing gasket according to the media pipeline characteristics, temperature and working pressure selected, commonly used in rubber mats, rubber mats asbestos, asbestos pads and metal pads and so on. To enhance the sealing performance of gaskets in the gasket should be coated on both sides in order to be able to resist medium leakage, non-chemical reaction with the media since the sealing agent.