Hongwo Sealing Gasket
I. Sealing Principle
PTFE flange gasket is a sealing component that prevents the leakage of media. The sealing principle relies on the elastic deformation theory of compression. Pre-tightening the flange bolts compresses the gasket. It fills the gap between the two flange ends and prevents media leaks. The compressive force on the gasket can now fully contact the sealing surface. This improves the seal.
II. Influencing Factors
1. Surface Roughness of Sealing Surface
The smoothness of the sealing surface affects a PTFE flange gasket’s seal. The smoother the sealing surface, the better the gasket can fill the gap. It will be more resistant to erosion and compression.
2. Material Hardness
The material hardness of the gasket also affects its sealing performance. If the material is too hard, the gasket will deform unevenly when compressed. This will cause a poor seal. If it is too soft, the media will likely penetrate or wear it down.
3. Pre-tightening Force
The pre-tightening force is the pressure from the flange bolts on the sealing surface. The greater the pre-tightening force, the better the sealing effect of the gasket. But if the pre-tightening force is too high, it will deform the gasket or cause poor contact. This will destroy the seal.
4. Medium Pressure and Temperature
The pressure and temperature of the medium also affect the sealing effect of the gasket. High pressure and temperature can cause the gasket to expand or soften. This will harm its seal and may cause it to fail. So, when choosing a gasket, consider the medium’s temperature and pressure.
III. Suggestions for Selecting the Appropriate Gasket
Choose the right PTFE flange gasket to ensure a good seal. Generally, you should consider the following factors when choosing a gasket:
1. Determine the highest temperature and pressure in the application environment.
2. Find the gasket’s medium and any special environmental requirements.
3. Choose the material’s hardness and thickness based on the sealing surface’s roughness.
4. Determine the appropriate pre-tightening force and fastening method.
IV. Conclusion
This article explains the sealing principle of PTFE flange gaskets. It also covers the factors that affect their sealing performance. Choosing the right gasket is key to a good seal on the flange. So, we must closely consider the application and medium. Then, we should choose the gasket wisely.
