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Advantages and disadvantages of various types of flanges

Flat flange

Advantages: simple structure, convenient processing and disadvantages: The contact area is large, the required pre-tightening pressure is large, and the bolt bearing is large, so the flange and other parts are required to be high, bulky, the gasket is easy to be extruded, and the sealing performance is poor. The use pressure P≤2.5Mpa, toxic, flammable, easy Cannot be used in explosive media.


Concave surface flange

Advantages: easy to center, can prevent gasket extrusion, less scouring and corrosion of medium for low pressure occasions: It is not convenient to replace the gasket.


Grooved surface flange

Advantage: It consists of the kneading surface and the groove surface. The gasket is placed in the groove and will not be squeezed out of the pressing surface. It is less subject to the erosion and corrosion of the medium. Because the sealing surface is narrow, the bolt force required is small. Where the pressure is higher and the sealing requirements are strict, such as flammable, explosive and high or extremely dangerous toxic medium, the main disadvantages are: the structure is complicated, the gasket is easily squeezed in the tank and is difficult to remove, and it is difficult to replace the gasket. It should also be noted that the kneading flange is protected during transportation to avoid collision deformation.


Ring joint flange

Advantages: The ring connecting surface is mainly used on the neck butt welding flange and the integral flange. The sealing performance is good, the installation requirements are general, and it is used in high temperature and high pressure working conditions. The sealing surface has high processing precision.


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