1. Raised Face (RF):
The surface is a smooth plane and can also have serrated grooves. The sealing surface has a simple structure, is easy to manufacture, and is suitable for anti-corrosion lining. However, this type of sealing surface has a large gasket contact area, making it prone to gasket extrusion during pre-tightening, which makes it difficult to achieve proper compression.
2. Male-Female (MFM):
The sealing surface consists of a convex and a concave surface that fit together. A gasket is placed on the concave surface, preventing the gasket from being extruded. Therefore, it is suitable for high-pressure applications.
3. Tongue and Groove (TG):
The sealing surface is composed of tongues and grooves, with the gasket placed in the groove. It prevents the gasket from being displaced. Smaller gaskets can be used, resulting in lower bolt forces required for compression. This design is effective for achieving a good seal, even in high-pressure conditions. However, the drawback is that the structure and manufacturing process are relatively complex, and replacing the gasket in the groove can be challenging. Additionally, the tongue portion is susceptible to damage, so caution should be exercised during assembly, disassembly, or transportation. Tongue and groove sealing surfaces are suitable for flammable, explosive, toxic media, and high-pressure applications. Even with a larger diameter, they can still provide an effective seal when the pressure is not too high.
4. Saky Steel Full Face (FF) and Ring Joint (RJ):
Full face sealing is suitable for low-pressure applications (PN ≤ 1.6MPa).
Ring joint surfaces are primarily used for neck-welded flanges and integral flanges, suitable for pressure ranges (6.3MPa ≤ PN ≤ 25.0MPa).
Other Types of Sealing Surfaces:
For high-pressure vessels and high-pressure pipelines, conical sealing surfaces or trapezoidal groove sealing surfaces can be used. They are paired with spherical metal gaskets (lens gaskets) and metal gaskets with elliptical or octagonal cross-sections, respectively. These sealing surfaces are suitable for high-pressure applications but require high dimensional accuracy and surface finish, making them challenging to machine.
Post time: Sep-03-2023