Flange covers are mainly used for pipe ends or as heads. In order to match the flange, basically a flange is equipped with a flange cover, thereby determining the pressure level of the flange cover, the type of sealing surface, and the nominal diameter. But the nominal diameter range of PN1.0 and 1.6MPa is DN10~1200, and PN2.5 is DN10~600. Slightly smaller than the diameter range of flanges. This is because the diameter range of the flange cover in the ISO and DIN pipe flange standards is the same, and when the pressure is high and the nominal diameter is large, there is no reliable empirical judgment on the strength calculation results of the flange cover. . There are five types of sealing surface of flange cover: full plane, protruding surface, concave-convex surface, tongue and groove surface and ring connection surface.

   Flange covers are mainly used for pipe ends or as heads. In order to match the flange, basically a flange is equipped with a flange cover, thereby determining the pressure level of the flange cover, the type of sealing surface, and the nominal diameter. But the nominal diameter range of PN1.0 and 1.6MPa is DN10~1200, and PN2.5 is DN10~600. Slightly smaller than the diameter range of flanges. This is because the diameter range of the flange cover in the ISO and DIN pipe flange standards is the same, and when the pressure is high and the nominal diameter is large, there is no reliable empirical judgment on the strength calculation results of the flange cover. . There are five types of sealing surface of flange cover: full plane, protruding surface, concave-convex surface, tongue and groove surface and ring connection surface.