PTFE Expansion Joints
PTFE Bellows Expansion Joint
A PTFE bellows expansion joint for corrosive-service piping where controlled axial, lateral or angular movement must be accommodated within the selected configuration. Mingchao catalog data covers DN25–DN1600 three-convolution configurations. Final selection should be confirmed against pressure, temperature, medium, concentration, movement, vacuum condition, flange requirements and piping-system design.
Also searched as a PTFE expansion joint, PTFE compensator, PTFE expansion bellows or polytetrafluoroethylene bellows compensator.
- Product Type
- PTFE Bellows Expansion Joint
- Size Range
- DN25–DN1600
- Movement
- Axial / Lateral / Angular
- Configuration
- Three-Convolution Data Available
- Connection
- Flanged
- Flexible Element
- PTFE Bellows
- Typical Service
- Corrosive Chemical & Process Piping
- Standard
- GB/T 15700-2008
Project ConfigurationProject-specific configurations are reviewed against confirmed movement, pressure, temperature, medium, vacuum, flange and piping-layout requirements.
Project Configuration
Mingchao can customize the product configuration based on the technical information, operating conditions and dimensional data you provide. Final configuration can be reviewed and manufactured to the approved project drawing.
PTFE Bellows Expansion Joint Overview
The Mingchao PTFE Bellows Expansion Joint is designed for piping systems that require movement accommodation together with a corrosion-resistant PTFE flexible element.
The PTFE bellows forms the flexible section of the joint, while the flanged assembly connects the unit into the piping system.
Current Mingchao catalog data covers DN25–DN1600 three-convolution configurations and provides axial, lateral and angular movement data together with size-dependent TF02-1 and TF02-2 catalog performance information.
The applicable national product standard follows GB/T 15700-2008, verified as the currently effective Chinese national standard at publication.
Final selection should consider pressure, temperature, process medium, concentration, movement, vacuum conditions, flange requirements and piping-system design.
PTFE Bellows Construction & Corrosion-Resistant Service
A PTFE bellows expansion joint uses a PTFE bellows as its primary flexible element. Depending on the selected configuration, the complete assembly may also include flanges, supporting or reinforcing components and control or limit hardware.
The number of convolutions and complete assembly design affect movement capability and operating performance. Mingchao’s current catalog provides three-convolution data and TF02-1 / TF02-2 catalog values. No unverified construction difference between TF02-1 and TF02-2 is claimed.
PTFE is selected for its chemical-resistance characteristics, but final suitability must always be checked against the actual medium, concentration, operating temperature and complete assembly conditions.
| Specification | Confirmed Product Data |
|---|---|
| Product Type | PTFE Bellows Expansion Joint |
| Product Standard | GB/T 15700-2008 |
| Model | No Fixed Model |
| Size Range | DN25–DN1600 |
| Bellows | PTFE Bellows |
| Connection | Flanged |
| Catalog Configuration | Three-Convolution Data Available |
| Movement | Axial / Lateral / Angular |
| Typical Service | Corrosive Chemical & Process Piping |
| Selection | Pressure / Temperature / Medium / Concentration / Movement / Vacuum / Flange / Piping Layout |
| Customization | According to confirmed project requirements |
Technical Data — Three-Convolution Movement & Length
The table publishes exact three-convolution movement and length values from the Mingchao C06 catalog. Size-dependent TF02-1 / TF02-2 working-pressure data exists in the source, but its unit and merged ranges are not published here pending confirmation against the applicable standard and factory configuration.
| DN | Axial Movement ΔX (mm) | Lateral Movement ΔY — TF02-1 (mm) | Lateral Movement ΔY — TF02-2 (mm) | Angular Movement Δθ (°) | Three-Wave Length L (mm) |
|---|---|---|---|---|---|
| 25 | 12 | 8 | 10 | 20 | 65 |
| 32 | 14 | 12 | 16 | 20 | 70 |
| 40 | 17 | 14 | 18 | 20 | 75 |
| 50 | 20 | 17 | 22 | 20 | 82 |
| 65 | 22 | 20 | 26 | 20 | 88 |
| 80 | 24 | 24 | 32 | 20 | 92 |
| 100 | 26 | 25 | 33 | 20 | 95 |
| 125 | 29 | 25 | 33 | 20 | 105 |
| 150 | 32 | 20 | 26 | 20 | 115 |
| 200 | 40 | 20 | 26 | 20 | 125 |
| 250 | 42 | 20 | 27 | 20 | 135 |
| 300 | 44 | 20 | 27 | 20 | 145 |
| 350 | 46 | 20 | 27 | 20 | 150 |
| 400 | 46 | 20 | 27 | 20 | 160 |
| 450 | 48 | 12 | 16 | 15 | 180 |
| 500 | 48 | 12 | 16 | 15 | 200 |
| 600 | 49 | 12 | 16 | 15 | 220 |
| 700 | 49 | 12 | 16 | 15 | 240 |
| 800 | 50 | 12 | 16 | 15 | 260 |
| 900 | 50 | 10 | 13 | 15 | 280 |
| 1000 | 52 | 10 | 13 | 15 | 300 |
| 1200 | 52 | 10 | 13 | 15 | 320 |
| 1400 | 54 | 8 | 10 | 15 | 340 |
| 1600 | 54 | 8 | 10 | 15 | 360 |
Movement values are configuration-specific. Pressure capability is size-, configuration- and temperature-dependent. Vacuum and flange-dimension columns remain hidden until their definitions, units and applicable configuration are confirmed.
Axial, Lateral & Angular Movement
Mingchao’s current three-convolution catalog data provides axial, lateral and angular movement values by nominal size. These values are configuration-specific and must not be added together arbitrarily or treated as unlimited simultaneous movement.
Torsion is not an intended movement mode for this PTFE bellows expansion joint. The piping system should be arranged so that the joint accommodates the intended movement without uncontrolled twisting or severe misalignment.
Flanged Connection & Project Configuration
The current Mingchao catalog shows a flanged PTFE bellows assembly. Project flange specification, pressure class, drilling, sealing face and mating dimensions must be confirmed before production.
The old catalog flange block contains legacy headings and merged dimensional ranges that are not republished as universal export dimensions. Where a project specifies another flange system, the required flange standard and approved drawing must be reviewed together with pressure, temperature, medium, vacuum condition and movement.
Applications in Chemical & Process Piping
Chemical Process Piping
Movement accommodation in chemical-process piping after PTFE compatibility and assembly conditions are confirmed.
Corrosive-Media Transfer
Flexible connection for compatible corrosive media with concentration, pressure and temperature reviewed together.
Tank & Reactor Connections
Movement accommodation around tanks and reactors according to the approved piping layout and support design.
Pump & Process Equipment
Flanged flexible connection near pumps or process equipment within the selected movement configuration.
Chemical Water Treatment
PTFE bellows service in water and wastewater chemical-treatment systems after media compatibility review.
Industrial Process Piping
Corrosion-resistant flexible element for process piping with project-specific pressure, movement and flange selection.
Application suitability depends on the actual medium, concentration, temperature, pressure, vacuum condition and complete assembly configuration. No universal chemical-compatibility claim is made.
How to Select a PTFE Expansion Joint
Provide the following operating and piping-layout information for technical review.
- DN / pipe size
- Required number of convolutions, if specified
- Required axial movement
- Required lateral movement
- Required angular movement
- Design pressure
- Normal working pressure
- Operating temperature
- Vacuum / external-pressure condition
- Process medium
- Chemical concentration
- Required flange standard
- Flange pressure rating
- Required face-to-face / installed length
- Piping orientation and layout
- Anchor and guide arrangement
- Control / limit-rod requirement
- Quantity
- Destination country
- Project drawing, specification, test and documentation requirements
Providing the actual operating and piping-layout conditions allows the PTFE bellows configuration, movement and connection requirements to be reviewed before quotation.
PTFE Bellows vs. PTFE-Lined Rubber Expansion Joint
| Selection Point | PTFE Bellows Expansion Joint | PTFE-Lined Rubber Expansion Joint |
|---|---|---|
| Flexible Element | PTFE bellows | Rubber body |
| PTFE Role | Forms the flexible bellows | Forms the wetted liner |
| Primary Selection | Movement / pressure / temperature / vacuum / convolutions / flange | Rubber movement / vibration / lining / pressure / medium |
| Chemical Service | PTFE bellows compatibility plus complete assembly review | PTFE lining protects the selected rubber joint from compatible media |
| Vibration | Within the selected PTFE configuration | Rubber construction is naturally suitable for vibration isolation |
| Product Identity | PTFE compensator / PTFE bellows | PTFE-lined rubber expansion joint |
| Interchangeability | Not universal | Not universal |
These products should not be selected interchangeably only because both use PTFE.
Anchors, Guides, Control Rods & Pressure Thrust
- Piping and equipment must be independently supported.
- Anchors and guides should control the intended piping movement.
- Pressure thrust must be considered in the piping-system design.
- The expansion joint must not support pipe or equipment dead weight.
- Control or limit hardware does not automatically replace anchoring required by the selected system design.
- Major pipe misalignment must not be corrected by forcing the expansion joint into position.
Installation, Inspection & Safety Considerations
Verify the selected configuration and approved piping-system design before installation.
Product Identity
Verify product identity, DN and selected configuration before installation.
Operating Conditions
Confirm pressure, temperature, vacuum, medium and chemical concentration.
Movement
Confirm required axial, lateral and angular movement.
Flange Requirement
Confirm flange standard, pressure class and mating dimensions.
No Torsion
Do not apply torsion to the PTFE bellows.
Alignment
Do not use the joint to correct severe piping misalignment.
Independent Support
Support connected piping and equipment independently.
PTFE Protection
Protect PTFE convolutions from scratches, impact and sharp tools.
Hot-Work Protection
Protect PTFE from welding spatter and other hot work.
Sealing Surfaces
Keep flange and sealing surfaces clean.
Pre-Installation Inspection
Inspect the bellows and control components before installation.
Control Hardware
Do not alter factory-set control or limit hardware without approval.
Anchors & Guides
Install anchors and guides required by the approved piping design.
Testing
Pressure and leak testing must follow the selected product and project procedure.
Post-Test Inspection
Inspect the joint before service after testing.
Site Safety
Corrosive or hazardous media systems require appropriate site safety controls.
Real Product Photos & Technical References
The photograph shown is the exact C06 PTFE bellows product published in the current Mingchao catalog. Available technical references include the confirmed three-convolution movement table and project-specific selection information.
GB/T 15700-2008 is the current applicable Chinese national product standard. The catalog’s GB/T 12777-2008 reference was removed because that obsolete standard applies to metal bellows expansion joints, not this PTFE bellows product.
Pressure, vacuum, flange dimensions, testing and documentation must be confirmed for the selected configuration and project requirements before production.