PTFE lined metal bellows expansion joint
DN25-DN500.
PTFE lined metal bellows expansion joint adopts outer metal bellows with seamless PTFE lining. It absorbs pipeline thermal displacement and withstands pressure, while PTFE lining provides outstanding corrosion resistance for strong corrosive media. Optional tie rods, flow liner and vacuum support ring available. Designed per EJMA/GB standards for chemical, wastewater and desulfurization piping.
Delivery
EXW
minimum order
10 pieces
Supply Ability
100pieces / Day
Country of Origin
CHINA
Stock Time
7Day
Quantity:
US $10.00 - US $200.00 / pieces
Product Introduction
PTFE lined metal bellows expansion joint consists of outer metal bellows and inner seamless PTFE lining. The metal bellows bears pipeline pressure and absorbs thermal displacement, while PTFE lining isolates corrosive media. It combines high pressure resistance of metal and excellent corrosion resistance of PTFE, widely used in strong corrosive chemical pipelines.
Main Technical Data Table
| Item | Specification |
|---|---|
| Product Name | PTFE Lined Metal Bellows Expansion Joint |
| Nominal Diameter | DN25 ~ DN1600 (Custom larger size available) |
| Pressure Rating | PN0.6 / PN1.0 / PN1.6 MPa (High pressure customized) |
| Working Temperature | -20℃ ~ 180℃, short term max 200℃ |
| Bellows Material | 304, 316L, 254SMo, Hastelloy |
| Lining Material | PTFE (thickness: 2~3mm seamless molding) |
| Flange Material | A105, 304, 316L; flange face PTFE lined |
| Optional Accessories | Limit tie rods, internal flow liner, vacuum support ring (mandatory for negative pressure) |
| Applicable Media | Most acids, alkalis, salt solutions, strong oxidants, organic solventsNot suitable for molten alkali metals |
| Design Standard | GB/T12777-2019, HG/T3985, EJMA, ASME B16.5, GOST33259 |
| Fatigue Life | ≥5000 cycles (EJMA fatigue calculation available) |
Features
- Superior corrosion resistance, anti-scaling, smooth inner surface for easy cleaning
- High pressure bearing capacity compared with full PTFE expansion joint
- Limit rods protect bellows from over-displacement damage
- Vacuum support ring required under negative pressure to prevent PTFE lining collapse
Application Fields
Chemical industry, waste water treatment, desulfurization, pharmaceutical, metallurgy pickling line, pump & fan inlet/outlet.
Inquiry Information Required
- Medium name & concentration
- Working temperature & working pressure (positive / negative pressure)
- Nominal diameter, flange standard
- Required displacement: axial, lateral, angular movement
- Wave quantity, accessories requirement
- Fatigue cycles, material certificate (MTC 3.1), test reports
FAQ
- What types of displacement can this expansion joint absorb?
- It is engineered to absorb multi-dimensional displacements, including axial elongation and compression, lateral offset, and angular deflection.
- What materials are available for the bellows?
- Bellows materials can be customized to include Stainless Steel, Carbon Steel, PTFE, HDPE, EPDM, and NBR.
- Is OEM or ODM service available?
- Yes, OEM/ODM services are available, allowing for customization from samples or designs.
- What is the maximum design pressure?
- The maximum design pressure for this expansion joint is up to 4.0MPa.
- What certifications does the product hold?
- The product is certified with CE, ISO14001, JIS, and ISO9001 standards.
- What is the warranty period for this expansion joint?
- The warranty period provided is 6 months.
- What is the minimum order quantity?
- The minimum order quantity is 1 set.
- What is the lead time for production?
- The lead time is within 15 workdays during the off-season and within one month during the peak season.