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SPECIFICATION FOR SIX TYPES GASKET BETWEEN FLANGE
2024.08.06
1 Graphite gasket
Flat gaskets made of soft graphite for use in high-temperature, highly corrosive media.
2 Metal gaskets
There are three main types:
1) Octagonal and oval pads – suitable for trapezoidal trough flange sealing faces;
2) The tooth form is to process the bevel tooth corrugation on the sealing surface of the metal flat gasket - suitable for the concave and convex flange sealing surface;
3) Lens pad – suitable for lens flange sealing surface.
Metal gaskets are available in a variety of materials such as pure iron, extremely mild steel, stainless steel, and aluminum.
The processing accuracy and surface roughness of the sealing surface of the metal gasket are very high, and the bolt pressing force is very large, which is used in high temperature and high pressure valves.
3 Metal-clad graphite gasket
It is made of a thin metal clad annular asbestos gasket. It is generally used on the sealing surface of concave-convex flanges. Valves for higher temperatures and pressures.
4 Spiral wound gaskets
It is made of a mixture of corrugated metal strip and sealing material strip. There are many kinds of steel belt-asbestos, steel belt-PTFE, steel belt-flexible graphite, etc. It is generally used for concave-convex flange sealing surfaces. Suitable for medium pressure valves at higher temperatures.
5 PTFE gaskets
It is generally used for tongue and groove sealing surface, mainly including PTFE and glass fiber PTFE. It is suitable for highly corrosive media at low temperatures and various pressures.
6 Asbestos rubber gaskets
Suitable for smooth flange sealing faces, concave and convex flange sealing faces and tongue-and-groove flange sealing faces. The advantages are good corrosion resistance and thermal stability, good plasticity, and small compression force to ensure sealing. The disadvantage is that the strength is low and it is easy to stick to the flange sealing surface. Asbestos rubber gaskets include universal asbestos boards, anti-corrosion asbestos boards, generally used asbestos boards, acid-resistant asbestos boards, oil-resistant asbestos boards, wire asbestos boards and other materials. It is used for medium pressure valves at higher temperatures.
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