Hot dip galvanized flange PTFE lined rubber expansion joint


Fluoroplastics have unique thermal stability, non-stick surface, extremely low friction coefficient and resistance to almost all forms of corrosive fluids and chemical attack.

PTFE lined rubber expansion joint

PTFE expansion joints are widely used in paper mills, chemical plants and other piping applications that handle acids and highly corrosive chemicals.

Our manufacturing capabilities include a full line of metal and rubber expansion joints lined with Teflon for the transfer of chemicals, strong acids, corrosive substances or other hazardous materials.

These liners cover all wetted surfaces in the bellows and flange areas and provide excellent resistance to nearly all chemicals.

1. Characteristics of PTFE lined rubber expansion joint 

1. Strong corrosion resistance: PTFE has excellent corrosion resistance and can resist the erosion of corrosive media such as strong acids, strong alkali, salts, etc., thereby ensuring the long-term stable operation of the pipeline system.

2. Good high temperature resistance: PTFE has a very high melting point and can maintain good performance at high temperatures. PTFE lined rubber expansion joint can be used for a long time in the temperature range of -200°C to +260°C, meeting the needs of various high-temperature pipelines.

3. Good aging resistance: PTFE is not easily oxidized in the air and is not easily affected by ultraviolet rays, so PTFE joints have a long service life.

4. Good oil resistance: PTFE has very good resistance to permeability of various oil media, and can effectively prevent the erosion of oil media and ensure the sealing performance of the pipeline system.

5. Easy installation: The PTFE lined rubber expansion joint adopts flange connection method, which is easy to install and can withstand large pressure and vibration, ensuring the safe and stable operation of the pipeline system.

2. Application of PTFE lined rubber expansion jointin pipeline systems

PTFE lined rubber expansion joints are widely used in various pipeline systems, such as chemical pipelines, petroleum pipelines, pharmaceutical pipelines, light industry pipelines, etc. In these fields, the main functions of PTFE joints are to connect pipelines, compensate for thermal expansion and contraction of pipelines, absorb pipeline vibrations, and prevent pipeline system leakage. At the same time, PTFE joints can also prevent the pipeline system from being interfered by external factors, such as earthquakes, wind shocks, etc., improving the safety and stability of the pipeline system.

2. Precautions for using PTFE lined rubber expansion joints

1. When installing PTFE lined rubber expansion joint, ensure that the flange end surface is flat, the center deviation of the bolt hole does not exceed 5% of the hole diameter, and the free penetration of the flange bolts is ensured.

2. When transporting and storing PTFE lined rubber expansion joint, avoid violent impacts and extrusions to prevent damage to the internal structure of the joints.

3. When using PTFE lined rubber expansion joint avoid exceeding the design pressure and temperature range to prevent damage to the joints.

4. When replacing PTFE lined rubber expansion joint, the old gaskets and residues should be removed first, and then an appropriate amount of sealant should be applied to ensure the sealing performance of the joints.

4. Conclusion

As a special rubber joint, PTFE lined rubber expansion joint have excellent corrosion resistance, high temperature resistance, aging resistance and oil resistance, and are widely used in various pipeline systems. When using PTFE lined rubber expansion joint, they should be operated and maintained in accordance with relevant regulations and precautions to ensure their long-term and stable service life and good sealing performance. With the continuous advancement of science and technology and the continuous expansion of application fields, PTFE lined rubber expansion joint will play a more important role in future pipeline systems.