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Rubber Bellow Swivel
1. Product Overview
Rubber expansion joints (flexible connectors) are vibration-absorbing, pressure-compensating connectors for piping systems, designed to absorb movement, reduce noise, and compensate for misalignment. They consist of elastomeric bellows with internal reinforcement and flange/threaded end connections.
Key Advantages
✔ Vibration Damping – Reduces pipe vibration by up to 95%
✔ Movement Absorption – Compensates for axial, lateral & angular movement
✔ Noise Reduction – Lowers water hammer & system noise
✔ Corrosion Resistance – Immune to electrolytic/galvanic corrosion
✔ Easy Installation – No special tools required
2. Construction Types
By Design Type
|
Type |
Movement Capability |
Max Pressure |
Primary Use |
|
Single Sphere |
Axial: ±15mm Lateral: ±10mm |
PN16 |
General water systems |
|
Double Sphere |
Axial: ±25mm Lateral: ±20mm |
PN10 |
High-movement applications |
|
Tied Single Sphere |
Angular: ±15° |
PN25 |
Pressure surge protection |
|
Flanged vs. Threaded |
– |
PN10-PN25 |
Small vs. large diameter systems |
Reinforcement Materials
Nylon Cord – Standard pressure resistance
Steel Wire – High-pressure applications (PN25+)
Kevlar® – Extreme burst pressure resistance
3. Elastomer Options
|
Material |
Temperature Range |
Chemical Resistance |
Common Applications |
|
EPDM |
-30°C to +120°C |
Acids, alkalis, ozone, steam |
Hot water, HVAC, chemicals |
|
NBR |
-20°C to +100°C |
Oils, fuels, hydrocarbons |
Petroleum, diesel systems |
|
Neoprene |
-40°C to +110°C |
Weather, seawater |
Marine, outdoor installations |
|
Silicone |
-60°C to +230°C |
High-temperature air/steam |
Food, pharma, exhaust systems |
|
Hypalon® |
-40°C to +150°C |
Strong oxidizers, chlorinated water |
Water treatment, bleach lines |
4. Technical Specifications
|
Parameter |
Specification Range |
|
Size Range |
DN15–DN3000 (½"–120") |
|
Pressure Rating |
PN6–PN40 (ANSI 150–300) |
|
Burst Pressure |
3–5× working pressure |
|
Movement Capacity |
Axial: ±5–30mm Lateral: ±5–25mm Angular: ±5–15° |
|
Vacuum Rating |
Full vacuum (with wire reinforcement) |
5. Industry Applications
✔ HVAC Systems – Absorb thermal expansion in chillers
✔ Water Treatment – Compensate for pump vibrations
✔ Marine Engineering – Accommodate hull/pipeline movement
✔ Power Plants – Steam line vibration isolation
✔ Chemical Processing – Corrosion-resistant acid lines
6. Selection Guide
|
Application |
Recommended Type |
Elastomer |
Reinforcement |
|
Chilled Water |
Single Sphere, Flanged |
EPDM |
Nylon |
|
Fuel Oil Transfer |
Double Sphere, Threaded |
NBR |
Steel Wire |
|
Seawater Cooling |
Tied Single Sphere |
Neoprene |
Kevlar® |
|
Chemical Dosing |
Flanged, Lined |
Hypalon® |
PTFE Liner |
7. Installation Guidelines
Pre-Stretch – Extend 50% of max axial movement during installation
Alignment – Avoid permanent torsion (>5° twist)
Anchoring – Use control rods for pressure thrust applications
Avoid – Proximity to heat sources (>10cm from hot pipes)
8. Standards Compliance
ISO 9001 – Quality management
EN 14931 – European rubber joint standard
FDA 21 CFR – Food-grade compliance (silicone/EPDM)
DVGW – German water industry approval
UL Listed – Fire-resistant models
9. Why Choose Our Rubber Expansion Joints?
✅ Full Movement Compensation – Tested to EJMA standards
✅ Custom Fabrication – Odd sizes, special flanges, linings
✅ Extended Warranties – Up to 10 years for standard models
✅ Technical Support – Movement calculation services
Request our Vibration Isolation Guide or CAD Models!
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آدرس
20 خیابان Xingyuan جنوبی، شهرستان Zaoqiang، شهر Hengshui، استان هبی، چین
