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Flange is used for the connection between two equipment, also known as flange plate or flange, referred to as the form of sealing surface, with holes on it, using bolts to make two flanges tightly connected, - generally used for shaft and flange

    The mutual connection between shafts is also used for the connection between pipe ends; It is composed of flange, gasket and bolt, which are connected with each other as a group of detachable connection of combined sealing structure. Flange thickness under different pressures

Different, they use different forms.

    Take the most common raised face flange and concave convex face flange for example, in the flange connection, the convex face flange needs to cooperate with the concave face flange, commonly known as a male and female, while the raised face flange should cooperate with the raised face flange. In general, raised face flange should also be a kind of plane flange, code named RF, RF face can only be linked with RF face. The code of convex flange is m, and M flange needs to be connected with FM face. One is concave FM (female male) and the other is convex m (male). The compression of M / FM surface is better than that of RF surface. Raised face flange and raised face flange are used together, code name is RF. The comparison is as follows:

    However, the raised face flange is widely used in the market. Generally, there is no problem under 2.5MPa. Concave convex face flange has higher price and better sealing effect, so the applicable pressure level is relatively high. It is troublesome to design. For example, when the equipment condition drawing is provided, it is necessary to indicate what type of flange it is, and then when the nozzle material is counted, it is another kind of matching flange.