What are six types of flange gasket?
In piping, a gasket is a sealing material placed between the connecting flanges to form a static seal that maintains a leak proof seal under all operating conditions.Different types of gaskets are used to realize leak proof sealing between pipeline flanges.The main function of gasket is to seal the uneven surface of the flange, so that the flange joint will not leak the use of fluid.There are six types of flange gasket:
The graphite gasket is a flat gasket made of soft graphite.It is suitable for high temperature,highly corrosive media.
There are mainly three types:
1.octagonal and elliptical gasket – suitable for trapezoidal groove flange sealing surface
2.tooth form is to process the conical tooth shape ripple on the sealing surface of the metal flat gasket, which is suitable for the sealing surface of the concave convex flange;
3.lens pad – suitable for lens flange sealing surface. Metal gasket has pure iron, extremely soft steel, stainless steel, aluminum and other materials. The requirements of machining accuracy and surface roughness of metal gasket sealing surface are very high, and the bolt pressing force is very large, which is used in high temperature and high pressure valves.
Metal clad graphite gasket
It is made of thin metal covered with circular asbestos gasket. Generally used in MFM flange sealing surface. Suitable for valves with higher temperature and pressure.
It is composed of corrugated metal tape and sealing material tape. There are steel belt asbestos, steel belt polytetrafluoroethylene, steel belt flexible graphite and so on. Generally used for concave convex flange sealing surface. Suitable for medium pressure valves with high temperature.
Generally used for tenon and groove type sealing surface, mainly PTFE and glass fiber PTFE two materials. It is suitable for corrosive medium with low temperature and various pressures.
Asbestos rubber gasket
It is suitable for smooth flange sealing surface, concave convex flange sealing surface and mortise groove flange sealing surface. The utility model has the advantages of good corrosion resistance, thermal stability, good plasticity, and small compression force to ensure sealing. The disadvantage is low strength, easy to stick on the flange sealing surface. Asbestos rubber gasket has asbestos board, anti-corrosion asbestos board, generally using asbestos board, acid resistant asbestos board, oil resistant asbestos board, metal wire asbestos board and other materials. Used for medium pressure valves with high temperature.
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