Flanges are parts connected between shafts and shafts, and are used for the connection between pipe ends.
Sealing surface form of plate steel pipe flange marked with PN and applicable nominal pressure and nominal size range

Plate-type flange: easy to take materials, simple to manufacture, low cost, widely used; but the rigidity is poor, so it should not be used in chemical process piping systems with high demand, high flammability, explosiveness and high vacuum requirements. Hazardous occasions. The sealing surface type has a flat surface and a raised surface.
Plate type flange is a common flange, the pressure is PN2.5, PN6, PN10, PN16, PN25.
Material of plate flange: 201, 304.316.316L.0Cr18Ni9.321.202, carbon steel, 20 #, 20G, and alloy steel, etc.
Due to its good comprehensive performance, the plate flange is widely used in basic projects such as chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, freezing, sanitation, plumbing, fire fighting, power, aerospace, shipbuilding, etc.