Product Overview
The 8 Inch Double Sphere Rubber Expansion Joint with ductile iron
flanges is a high-flexibility pipe connector designed to absorb
vibration, reduce noise, and compensate for pipeline displacement.
It is widely used in water supply systems, HVAC pipelines, sewage
treatment, chemical plants, and shipbuilding industries.
The double sphere structure provides better flexibility, higher
pressure resistance, and longer service life compared to single
sphere types, making it ideal for demanding industrial
applications.
Key Features and Advantages
✅ 1. Enhanced Flexibility and Vibration Absorption
The double sphere rubber design increases movement capacity,
allowing axial compression, lateral offset, and angular deflection.
It effectively absorbs vibration from pumps and compressors,
protecting pipelines and extending service life.
✅ 2. High-Quality EPDM / NBR / Neoprene Material
The inner rubber layer is made of EPDM, NBR, or Neoprene, depending
on the medium:
EPDM: Excellent resistance to hot water, steam, and chemicals
NBR: Best for oil, gas, and fuel environments
Neoprene: Good for seawater and outdoor applications
This ensures durability and reliable sealing performance in various
working conditions.
✅ 3. Ductile Iron Flanges – Strong and Corrosion-Resistant
The flanges are made of ductile iron (QT450), offering high tensile
strength and good corrosion resistance.
They are produced according to ANSI 150, DIN PN10/PN16, JIS 10K or
customized standards, ensuring global compatibility and easy
installation.
✅ 4. Wide Temperature and Pressure Range
Working Pressure: PN10 / PN16 / 150LB
Temperature Range: -20°C to +120°C (depending on rubber material)
Nominal Diameter: DN25 – DN3000 (customized sizes available)
✅ 5. Noise and Shock Reduction
It significantly reduces vibration and water hammer effects in
pipelines, especially near pumps, chillers, and compressors,
creating a quieter and more stable system.
Applications
The 8-inch double sphere rubber expansion joint is suitable for:
1. Water treatment plants – absorb vibration and misalignment
2. HVAC systems – reduce thermal expansion stress
3. Chemical and petrochemical plants – resist corrosion and
chemical media
4. Marine and shipbuilding – withstand seawater and movement stress
5. Pumping stations – minimize noise and extend pump life
Why Choose Our Rubber Expansion Joints?
Factory direct supply – competitive pricing and fast delivery
Over 20 years manufacturing experience
OEM / ODM service available
Strict quality control – 100% pressure test before shipment
Exported to 60+ countries worldwide
Our products have earned trust from customers in Europe, the Middle
East, Southeast Asia, and North America, especially in water
treatment and energy industries.
FAQ
Q1: What is the difference between single and double sphere rubber
expansion joints?
A1: The double sphere type offers greater flexibility and
displacement absorption capacity, suitable for systems with higher
vibration or movement.
Q2: Can this joint be used for seawater or chemical media?
A2: Yes. For seawater, choose Neoprene rubber; for chemical
resistance, select EPDM material.
Q3: Do you support custom flange standards?
A3: Yes, we can provide ANSI, DIN, JIS, and customized standards to
match your pipeline requirements.
Contact Us
Looking for a reliable rubber expansion joint supplier?
We are a professional manufacturer of rubber sphere rubber joints ,
providing high-quality products at competitive prices.
Website: www.rubberflexiblejoint.com
Contact: +86-18838958009
