Sealing and connection types of commonly used flanges-Zhongneng Guojian Pipeline|Manufacturers of elbows and fittings

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Sealing and connection types of commonly used flanges

Sep 10,2024

Summary: The flange gasket is placed between the two flange sealing surfaces.

Sealing and connection types of commonly used flanges

There are three types of flange sealing surfaces: flat sealing surfaces, suitable for situations with low pressure and non-toxic media; Concave convex sealing surface, suitable for situations with slightly higher pressure; Mortise and tenon sealing surface, suitable for flammable, explosive, toxic media and high-pressure environments.
The flange gasket is placed between the two flange sealing surfaces. After tightening the nut, the specific pressure on the gasket surface reaches a certain value and deforms, filling the uneven areas on the sealing surface to ensure a tight and leak free connection. In high-voltage equipment and pipelines, lens shaped or other shaped metal gaskets made of copper, aluminum, No. 10 steel, stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the machining smoothness of the sealing surface and gasket is high. Ordinary rubber gaskets are suitable for situations where the temperature is below 120 ℃; Asbestos rubber gasket is suitable for situations where the temperature of water vapor is below 450 ℃, the temperature of oil is below 350 ℃, and the pressure is below 5MPa. For general corrosive media, acid resistant asbestos board is the most commonly used.
A flange is a component that connects pipes to each other. Connected to the pipe end, there are usually holes on the flange that can be threaded with bolts to tightly connect the two flanges. Seal the flanges with gaskets. Flanged pipe fittings refer to fittings with flanges (flanges or flanges). It can be made by casting (not shown in the picture), or by threaded connection or welding. The flange connection consists of a pair of flanges, a gasket, and several bolts and nuts.

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