Round Non-Metal Expansion Joint
High Temperature Flexible Expansion Joint for Industrial Ducting Systems
A Round Non-Metallic Expansion Joint is a high-performance flexible connector designed for industrial piping and duct systems to absorb thermal expansion, vibration, noise, and mechanical misalignment. Compared with traditional metallic expansion joints, non-metallic expansion joints provide superior flexibility, corrosion resistance, lightweight construction, and excellent vibration isolation performance.
As a professional non-metallic expansion joint manufacturer and supplier, we provide customized round fabric expansion joints for HVAC systems, flue gas pipelines, power plants, chemical plants, steel mills, cement plants, marine exhaust systems, and industrial ventilation applications.
What Is a Round Non-Metallic Expansion Joint?
A round non-metallic expansion joint, also called a:
- Fabric Expansion Joint
- Flexible Duct Expansion Joint
- Rubber Fabric Expansion Joint
- High Temperature Expansion Joint
- Circular Fabric Compensator
- Non-Metallic Bellows Expansion Joint
is engineered using multi-layer composite fabrics and elastomer materials instead of metal bellows.
The product is specially designed to compensate for:
- Thermal expansion
- Axial movement
- Lateral displacement
- Angular deflection
- Equipment vibration
- Pipe misalignment
while maintaining reliable sealing performance in low-pressure gas and air systems.
Main Features of Round Non-Metallic Expansion Joints
Excellent Thermal Expansion Compensation
Designed to absorb multi-directional movement caused by temperature fluctuations in industrial duct systems.
Superior Vibration Isolation
Effectively reduces vibration transmission from:
- Fans
- Blowers
- Pumps
- Compressors
- Turbines
High Temperature Resistance
Available operating temperature range:
- Standard: -196°C to +650°C
- Special design: Up to 1000°C
Excellent Corrosion Resistance
Suitable for:
- Acidic gas
- Corrosive vapor
- Flue gas
- Dust-containing gas
- Chemical exhaust systems
Lightweight & Flexible Design
Provides:
- Low spring rate
- Reduced anchor load
- Easy installation
- Lower maintenance costs
Excellent Airtight Sealing
Designed for:
- Positive pressure systems
- Negative pressure systems
- Vacuum duct applications
Round Non-Metallic Expansion Joint Structure
Inner Liner
Media-contact layer providing sealing and chemical resistance.
Available materials:
- PTFE
- EPDM
- Silicone Rubber
- FKM / Viton®
Reinforcement Layer
Provides mechanical strength and pressure resistance.
Material options:
- Fiberglass Fabric
- Aramid Fiber (Kevlar®)
- Polyester Fabric
Insulation Layer
Optional thermal insulation for high-temperature systems.
Materials:
- Ceramic Fiber
- Glass Wool
- Aluminum Silicate Fiber
External Protective Cover
Protects against:
- UV exposure
- Abrasion
- Moisture
- Weathering
Available Materials
| Component | Material Options |
|---|---|
| Flexible Skin | Silicone Rubber, PTFE, EPDM, FKM |
| Reinforcement Fabric | Fiberglass, Aramid, Polyester |
| Insulation Layer | Ceramic Fiber, Glass Wool |
| Flanges | Carbon Steel, SS304, SS316L |
| Tie Rods / Bolts | Galvanized Steel, Stainless Steel |
Technical Specifications
| Technical Parameter | Typical Range |
|---|---|
| Nominal Diameter | DN200 – DN5000 |
| Axial Movement | ±25 mm to ±200 mm |
| Lateral Movement | ±15 mm to ±100 mm |
| Angular Movement | ±1° to ±8° |
| Working Pressure | PN0.025 MPa – PN0.4 MPa |
| Operating Temperature | -196°C to +650°C |
| Maximum Temperature | Up to 1000°C |
| Applicable Media | Flue gas, hot air, steam, exhaust gas, corrosive vapor |
Industrial Applications
Water Supply Valve Power Plant Expansion Joint
Widely used in:
- Boiler systems
- Flue gas desulfurization systems (FGD)
- SCR systems
- Air preheaters
HVAC Flexible Expansion Joint
Suitable for:
- Ventilation ducts
- Air handling units
- Cooling towers
- Fan connections
Industrial Exhaust Systems
Applied in:
- Turbine exhaust systems
- Engine exhaust pipelines
- Dust collection systems
- Industrial ventilation systems
Chemical & Petrochemical Industry
Ideal for:
- Corrosive gas pipelines
- Chemical exhaust systems
- Acid vapor transportation
Cement & Steel Plants
Used in:
- High-temperature gas ducts
- Dust removal systems
- Furnace exhaust pipelines
Marine Exhaust Systems
Suitable for:
- Ship engine exhaust
- Offshore ventilation systems
Advantages of Non-Metallic Expansion Joints
Compared with metallic expansion joints, round non-metallic expansion joints offer:
- Better flexibility
- Larger movement absorption
- Lower noise transmission
- Excellent corrosion resistance
- Reduced vibration transfer
- Lower installation stress
- Lightweight construction
- Easier maintenance
- Longer service life in corrosive environments
Manufacturing Standards
Design Standards
- EJMA Standards
- ASME B31.3
- SMACNA Standards
- ASHRAE Standards
Material Standards
- ASTM D578
- ASTM D5748
- ASTM D2000
- ASTM A240
Round Non-Metallic Expansion Joint Dimensions
| DN | Flange OD | Length | Bolt Holes |
|---|---|---|---|
| DN200 | 300 mm | 250 mm | 8 |
| DN500 | 620 mm | 300 mm | 12 |
| DN1000 | 1140 mm | 350 mm | 16 |
| DN1500 | 1660 mm | 400 mm | 20 |
Custom sizes and special configurations are available according to project requirements.
Why Choose Our Round Non-Metallic Expansion Joints?
Professional Manufacturer
Years of experience in industrial expansion joint production and engineering solutions.
Customized Design
Custom manufacturing based on:
- Temperature
- Pressure
- Media
- Movement requirements
- Installation conditions
Strict Quality Control
Each product undergoes:
- Dimensional inspection
- Leak testing
- Material verification
- Movement testing
Global Export Experience
Exported to:
- Power plants
- EPC contractors
- HVAC projects
- Industrial facilities worldwide