Flexible Rubber Joint – Union Type
Flexible Rubber Joint – Union Type
Compact Vibration-Absorbing Rubber Connectors for Oilfield, Marine, and Civil Pipeline Systems
🔍 What is a Flexible Rubber Joint (Union Type)?
A Flexible Rubber Joint – Union Type is a small-diameter, threaded-end expansion joint used to absorb vibration, reduce noise, and compensate for slight misalignments or thermal movement in pipelines. It consists of:
- A molded rubber body (single sphere or double sphere)
- Threaded union ends galvanized iron
- These are widely used in domestic, industrial, and commercial pipelines and are ideal for compact installations where flanged connections are not possible.
⚙️ Technical Features & Specifications
Feature | Specification |
Size Range | ½” to 4” (DN15 to DN100) |
Pressure Ratings | Up to 16 bar (232 psi) |
Temperature Range | -10°C to +90°C |
Connection Type | Threaded BSP / NPT Union (Male x Female or Female x Female) |
Movement Capability | Axial, Lateral, Angular |
Rubber Types | EPDM, NBR, |
End Materials | Galvanized Iron (GI), |
Design Options | Single Sphere / Double Sphere |
🧪 Material Details
Component | Material | Features |
Rubber Body | EPDM / NBR / Neoprene | Resists water, oil, UV, seawater, chemicals |
Union Ends | GI | Threaded for easy install/removal |
Sealing Element | Molded Integral Rubber | High elasticity, leak resistance |
Thread Type | BSPT / NPT | Global piping compatibility |
📊 Pressure Ratings by Size and Rubber Type
Nominal Size | EPDM (Water Use) | NBR (Oil Use) | Neoprene (Marine Use) |
½” – 1” | 16 bar | 10 bar | 12 bar |
1½” – 2” | 12 bar | 8 bar | 10 bar |
2½” – 4” | 10 bar | 6 bar | 8 bar |
💡 Pressure ratings vary depending on temperature, rubber type, and installation method.
🌍 Industries & Applications
Flexible Rubber Union Joints are suitable for:
- Oilfield Pipelines – Vibration damping at pumps, separators, or control valves
- Marine & Shipbuilding – Saltwater lines, bilge systems, engine connections
- Civil Infrastructure – Building services, plumbing, HVAC systems, pressure pumps
- Water Supply & Drainage – Expansion joints in potable water and sewage lines
- Fire Protection Systems – Used in sprinkler and hydrant risers
✅ Key Advantages
- 🚀 Compact design – Perfect for space-restricted piping systems
- 🔧 Threaded unions – Easy to install, remove, and replace
- 🔇 Vibration & noise reduction – Ideal for pump or motor connections
- 💦 Leak-proof sealing – Ensures long service life under pressure
- 🌊 Chemical & saltwater resistance – With NBR or Neoprene rubber
- 🔄 Movement absorption – Accommodates axial and lateral pipe stress
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🛠️ Customization Options
Option | Availability |
Thread Type | BSPT, NPT |
Connection Ends | Male × Female, Female × Female |
Rubber Type | EPDM, NBR, |
Body Color | Black, Red, Blue (based on rubber type or media) |
Pressure Range | Standard (10–16 bar), Heavy Duty (20 bar, upon request) |
Flexible Rubber Joint – Union Type – Burj Al Noor Trading L.L.C
Flexible rubber joints – union type are connectors designed to absorb vibration, thermal expansion, and misalignment in piping systems while providing easy installation and maintenance. These joints consist of a rubber body with union ends that allow simple assembly and disassembly without the need for welding, reducing downtime and installation effort.
They are widely used in HVAC, water supply, sewage systems, chemical plants, and various industrial applications where flexibility, durability, and leak-proof connections are essential. The rubber construction ensures excellent resistance to wear, corrosion, and pressure fluctuations.
At Burj Al Noor Trading L.L.C, we are trusted flexible rubber joint suppliers in Dubai, specializing in flexible rubber joints – union type suppliers in Dubai. Our union type joints are engineered to accommodate axial, lateral, and angular movements, protect pumps, valves, and piping systems from stress, and provide long-lasting performance.
Whether for chilled water, drainage, chemical transfer, or process piping, our flexible rubber joints – union type ensure reliable operation, easy installation, and extended service life. They are designed to minimize maintenance costs while maintaining system integrity under variable pressure and temperature conditions.
Our Range of Flexible Rubber Joints – Union Type Includes:
Single Sphere / Single Arch Flexible Rubber Joints
Double Sphere / Double Arch Flexible Rubber Joints
Reinforced High-Pressure Flexible Rubber Joints
PTFE-Lined or Chemical-Resistant Rubber Joints
Customized Sizes and Union End Specifications
Choose Burj Al Noor Trading L.L.C as your trusted flexible rubber joint suppliers in Dubai. We provide high-quality products, competitive pricing, and timely delivery for contractors, industries, and infrastructure projects across the UAE.
We deal in all kinds of flexible rubber joints, including: union type, single-sphere, double-sphere, reinforced, PTFE-lined, chemical-resistant, and custom-designed flexible rubber joints for industrial and commercial applications.