PTFE Corrugated Compensator SS & Galvanized Carbon Steel Flange

1. Core Structure & Material Selection

1. Inner PTFE Lining
   Manufactured from virgin PTFE, soluble polytetrafluoroethylene (PFA), or fluorinated ethylene propylene (FEP), the lining is formed as a seamless, integral structure without joints or pinholes to prevent medium leakage.
   Key Properties: Exceptional chemical inertness, resistant to strong acids, alkalis, oxidants, and various organic solvents; smooth, non-adhesive inner surface that avoids medium residue and scaling; broad temperature tolerance range from -200ºC to +260ºC, with PFA linings capable of short-term operation at 300ºC.
2. Metal Bellows Substrate
   Serving as the flexible support core of the expansion joint, the bellows are typically made of SS304 or SS316L stainless steel. For extreme corrosive environments, materials such as Hastelloy or Monel can be adopted.
   Key Properties: The corrugated structure enables multi-dimensional displacement compensation (axial, lateral, angular); the metal material provides excellent pressure resistance and structural rigidity, ensuring minimal deformation during operation.
3. Outer Metal Braid Layer
   Woven from stainless steel wire of the same material as the bellows, this layer tightly wraps around the outer surface of the bellows.
   Key Functions: Restricts axial expansion of the bellows under pressure to enhance pressure rating; protects the bellows from external mechanical impact and scratches; improves the fatigue resistance of the expansion joint and extends its service life.
4. End Connection Components
   Including flanges, threaded joints, or welded ends, these components are made of materials matching the bellows (primarily SS304/316L). A special sealing structure is applied at the interface between the end components and the PTFE lining to prevent medium leakage and ensure overall sealing performance.

2. Key Technical Advantages

1. Superior Corrosion Resistance for Harsh Media
   The PTFE lining isolates the metal components from direct contact with the transported medium, enabling safe conveyance of various corrosive substances such as sulfuric acid, hydrochloric acid, nitric acid, strong alkalis, and organic solvents. This resolves the common failure issue of traditional metal expansion joints caused by corrosion.
2. Multi-Dimensional Compensation to Reduce Pipeline Stress
   It effectively compensates for axial displacement (±5% of hose length), lateral displacement (±30mm), and angular deflection (±15°) caused by thermal expansion and contraction of pipelines. It also absorbs vibrations generated by equipment such as pumps and valves, reducing stress concentration in the pipeline system and protecting pipeline and equipment interfaces.
3. Hygienic Performance for High-Purity Requirements
   The PTFE lining complies with hygiene standards such as FDA, 3A, and USP Class VI. Its smooth surface does not adsorb media, avoiding secondary contamination, making it suitable for high-purity fluid transportation in food and beverage, pharmaceutical, and semiconductor industries.
4. Wide Temperature & Pressure Compatibility
   Operating temperature ranges from -200ºC (for cryogenic media like liquid nitrogen) to 260ºC (for high-temperature fluids). Nominal pressure can reach PN0.6~PN25 (Class 150~Class 300), meeting the requirements of both conventional industrial and special working conditions.
5. Easy Installation & Maintenance
   The lightweight overall structure supports flexible connection methods (flange/thread/welding) and requires no special tools for installation. For post-operation maintenance, the product can be directly disassembled and replaced without cutting the pipeline, significantly reducing downtime costs.

3. Typical Technical Specifications

4. Main Application Scenarios

1. Chemical Industry: Acid and alkali medium transportation pipelines, chemical reactor discharge lines, solvent recovery systems.
2. Pharmaceutical & Food Industry: Medicinal liquid conveying pipelines, sterile water systems, juice/dairy/sauce food material transportation lines.
3. Semiconductor Industry: Ultrapure water (UPW) delivery systems, electronic-grade chemical (EGC) transfer pipelines.
4. Petrochemical Industry: Corrosive catalyst transportation lines, refinery by-product treatment pipelines.
5. Cryogenic & High-Temperature Engineering: Liquid nitrogen/liquid oxygen cryogenic medium pipelines, high-temperature steam conveying pipelines.

5. Selection Guidelines

1. Choose the lining material based on medium type: PTFE is preferred for highly corrosive media, while PFA is suitable for high-temperature and high-frequency working conditions.
2. Determine the nominal pressure rating and metal material according to operating pressure and temperature to avoid over-range use.
3. Calculate the rated compensation capacity of the expansion joint based on pipeline displacement to ensure the selected model meets actual requirements.
4. For hygienic applications, select a dead-leg-free structural design and verify compliance with relevant industry certification standards.

 

a) How can I get more details about your products?
You can send an email to our email address. We will provide catalogue and pictures of our products for your reference.We can also supply pipe fittings, bolt and nut, gaskets etc. We aim to be your piping system solution provider. 
b) How can I get some samples?   
If you need, we will offer you samples for free, but new customers are expected to pay express charge. 
c) Do you provide customized parts? 
Yes, you can give us drawings and we will manufacture accordingly. 
d) To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru , Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.). 
e) I can't see the goods or touch the goods, how can I deal with the risk involved?  
Our quality management system conforms to the requirement of ISO 9001:2015 verified by DNV. We are absolutely worth your trust. We can accept trial order to enhance mutual trust.