Product Overview
The Double Sphere Rubber Expansion Joint is a flexible connector designed to absorb pipe system vibration, thermal expansion, and noise transmission. Featuring a double-sphere structure, it offers greater displacement and shock absorption compared to single-sphere models, delivering reliable piping protection under demanding operating conditions.
This product is widely used in industrial water supply, HVAC systems, fire protection pipelines, pump systems, desalination plants, and chemical applications.
Key Features & Advantages
Enhanced Flexibility & Movement Compensation
Double bulb design provides increased axial, lateral, and angular movement capabilities, ideal for complex system layouts.
Superior Vibration & Noise Reduction
Effectively protects pumps, valves, chillers, and pipeline equipment from dynamic loads and mechanical stress.
Leak-Proof & Durable Construction
High-strength synthetic rubber bonded with reinforced nylon cord fabric, ensuring excellent sealing and long service life.
Corrosion & Pressure Resistance
Available in EPDM, NBR, Neoprene, NR, and PTFE lined options to support various media including seawater, oil, chemical liquids, and hot water.
Easy Installation & Maintenance
Standardized flanged connection integrates easily with global pipeline standards (DIN, ANSI, JIS, BS).
Recommended Material Options
| Rubber Material | Suitable Medium | Temperature Range |
| EPDM | Hot water, steam, weak acid/alkali, HVAC | -20°C ~ +120°C |
| NBR | Oil, fuel, gas | -20°C ~ +80°C |
| Neoprene | lime mortar, salt mist | -15°C ~ +100°C |
| Natural Rubber | General water systems | 0°C ~ +80°C |
| PTFE Lining | Strong acid/alkali, corrosive chemicals | -20°C ~ +150°C |
If your working conditions are complex and unique, please contact our technical staff to recommend materials suitable for your needs.
Typical Applications
1.Water supply and drainage systems
2.HVAC and chiller pipelines
3.Firefighting systems
4.Water treatment and desalination plants
5.Petroleum & chemical industry
6.Power plant cooling systems
7.Shipbuilding and marine pipelines
Installation Tips
Install with limit rods to avoid damage under high pressure or unstable operating conditions.
Do not compress excessively during installation; allow reserved displacement.
Suitable for both vertical and horizontal pipeline layouts.
Avoid direct exposure to sunlight and ozone environments—use protective covers outdoors.
Workshop
Frequently Asked Questions (FAQ)
Q1: Why choose a double sphere rubber expansion joint instead of a single sphere?
A double sphere provides higher movement absorption and better vibration reduction performance, especially suitable for long pipeline distances and high vibration environments such as pumps.
Q2: Do you support customized flange standards?
Yes, flanges can be manufactured according to ANSI 150/300, DIN PN10/PN16, JIS10K, BS, or customized drawings.
Q3: What is the maximum pressure rating?
Usually PN10, PN16, and PN25 are available. High-pressure reinforcement structure can be customized.
Q4: Can it be used for seawater or chemicals?
Yes, choose EPDM, Neoprene or PTFE lining depending on the medium.
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Double Sphere Rubber Expansion Joint | High Flexibility Vibration & Noise Reduction Connector for Piping Systems Images
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