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Plate flat flange
Plate flat welding flange (chemical standard hg20592, national standard GB / t9119, mechanical JB / T81): it is easy to obtain materials, simple to manufacture, low in cost and widely used; however, it has poor rigidity, so it can not be used in chemical process piping system with requirements of supply and demand, flammability, explosibility and high vacuum degree, and occasions with high and extreme hazards. The sealing surface type has flat surface and protruding surface.
