Brazing a refrigerant line means an open flame, a nitrogen purge and a fire risk inside an occupied building. So what if braze-free tube connections could remove all three?
VULKAN LOKRING® braze-free tube connections join refrigerant lines with a light hand tool in just a few seconds per joint. As a result, you get a hermetic, metal-to-metal seal while installation and servicing continue during business hours, with no fire risk.
From Space Technology to Everyday Cooling
Engineers originally developed the LOKRING® connection for manned space travel. Since then, they have refined it for more than 40 years. Today, five plants produce around 500,000 LOKRINGs every day and ship them to 83 countries. Now this German-engineered system is also available in Indonesia through PT Saka Nusa Persada.
How Braze-Free Tube Connections Work
Initially, the installer slides the LOKRING® over the joint. Then a hand tool presses it, which reduces its diameter until the tube and fitting form a hermetic, metal-to-metal connection. Because the process needs no filler metal, heat or purge gas, it stays clean and safe.
Key Advantages of VULKAN LOKRING® Braze-Free Tube Connections
- About 40% faster than brazing: every joint takes only seconds, so projects finish sooner.
- No flame, no nitrogen purge: therefore, you need no hot-work permit and no fire watch.
- Work during business hours: because there is no fire risk, occupied buildings can stay open.
- Hermetic metal-to-metal seal: in addition, both TÜV and UL approve it.
- Ready for modern refrigerants: including HFC, HC, R32 and CO₂.
- Light, portable tooling: especially useful in tight ceiling voids and for service work.
Technical Specifications
| Tube diameter | 6 to 41.3 mm (1/4″ to 1 5/8″) |
| Max. working pressure | 75 bar (1,088 psi) |
| Temperature range | −50°C to +150°C |
| Refrigerants | HFC, HC, R32, CO₂ |
| Approvals | TÜV, UL |
Typical Applications for Braze-Free Tube Connections
- Split and multi-split air conditioning
- VRV / VRF systems
- Commercial refrigeration
- Cold storage, especially where downtime is costly
- Heat pumps
- Solar and geothermal systems
Why Source VULKAN LOKRING® from PT Saka Nusa Persada
We support HVAC contractors and facility owners with product selection, sizing and on-site application support. In addition, we handle reliable delivery to your project. For the complete product range, visit the manufacturer, VULKAN Group. Need weld-equivalent joints for oil and gas piping too? Then see our LOKRING® coldweld pipe fittings.
Ready to make your next refrigeration project flame-free? Request a technical assessment, and then we will recommend the right braze-free tube connections for your system.
