KAK Aluminum Return Bends are engineered for high-efficiency HVAC and refrigeration applications, providing durable and leak-free tubing connections between coils or circuits.
Manufactured from premium 99.7% pure aluminum tubing, these U-type elbows ensure excellent thermal conductivity, corrosion resistance, and long-term reliability under pressure.
Key Features:
• Material: High-purity aluminum (99.7%) with bright, clean finish.
• Structure: Precision-drawn U-bend shape for condenser/evaporator return paths.
• Surface: Smooth interior walls for minimal flow resistance.
• Connection: Easy brazing with aluminum alloy filler or mechanical joining.
• Durability: Rust-proof and anti-oxidation treatment for extended coil lifespan.
• Temperature Range: -40 °C ~ +150 °C.
• Packaging: Sealed bags with anti-scratch and anti-moisture protection.
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Applications
✅ Air Conditioner Evaporator & Condenser Coils
✅ Refrigeration Systems (Commercial & Domestic)
✅ Heat Exchangers & Cooling Units
✅ Refrigerated Display Cabinets
✅ Aluminum Coil-to-Coil Connection or Circuit Return Lines
⚙️ Copper vs Aluminum Return Bends – Comparison for HVAC/R Systems
| Feature | Aluminum Return Bend | Copper Return Bend | Advantage |
|---|---|---|---|
| Density | Light (≈2.7 g/cm³) | Heavy (≈8.9 g/cm³) | 70% Lighter |
| Price | ⚡ Lower (40–60% of copper) | Higher, Volatile | Major Cost Saving |
| Corrosion | Excellent (Natural Oxide) | Moderate | More Durable |
FAQ
Q1: What is the function of aluminum return bends in HVAC systems?
A: They connect the ends of coil circuits, allowing refrigerant to return smoothly within the condenser or evaporator coil loops.
Q2: Are these bends compatible with copper tubes?
A: Normally, they are used with aluminum tubing to ensure metallurgical compatibility and prevent galvanic corrosion.
Q3: How should aluminum bends be joined?
A: Use aluminum brazing rods (e.g., 4047 or Al-Si alloys) under inert gas protection for a strong, leak-free connection.
Q4: Can I request custom angles or double-return shapes?
A: Yes, we support OEM / custom configurations including U-, W-, and S-type return bends for various coil layouts.
Q5: How are the products packaged for export?
A: Each bend is individually bagged, grouped by size, and packed in reinforced cartons or wooden crates with anti-oxidation liners.