Functional Principle
THE TYPICAL LOKRING union joint consists of two LOKRINGs and one tubular joint for the acceptance of the two tube ends. Thanks to the conical inner contour of the LOKRING and the special outer contour of the joint, the diameter of the connection is reduced during assembly to such an extent that the joint and the tube create a hermetically sealed metal-to-metal connection. The lifetime gas-tightness of the fitted connection is ensured by the state of permanent elastic pretension, which is produced by the radial forces of the LOKRINGs acting in the opposite direction to the tube-joint connection.
Technical Information
| Approvals | TÜV / UL (File SA12004) |
| Reference standards | EN 378-2 and ISO 14903 |
| Max. operating pressure | 75 bar (1088 psi) |
| Admissible refrigerants | HFC, HC, HFO, CO2 (unterkritisch) / not suitable for NH3 |
| Temperature range | -50°C up to 150°C (-58°F bis 302°F) |
| Tube diameter range | 6 mm up to 41.3 mm (1/4" bis 1 5/8") |
| Minimum tube wall thickness | 0.7 mm |
Sustainability
Since our tube connections are hermetically sealed, we can ensure that no climate damaging refrigerants leak into the environment. Furthermore, LOKRING makes the use of environmental friendly but flammable refrigerants (HC) safer and allows the use of CO2 (R744). Thus, by using LOKRING tube connections you make a contribution to the active protection of the environment.
