u2-Lok Twin ferrule fittings

This always depends on the specific application, as well as the condition and stress on the components. However, as part of the certification processes, 25 reinstallations were successfully tested under the EC79 certification and 10 reinstallations under the DNV certification. If the components are handled correctly, additional reassemblies are still possible.

The screw connection consists of a total of four components: the fitting, the union nut, the clamping ring, and the wedge ring. The sealing and pipe clamping functions are separated by the front wedge ring and the rear clamping ring.

The fitting is available as standard in straight, elbow, T-shaped, and cross configurations and serves as a media-base body for securely holding the pipe. The specially developed, extra-long pipe guide ensures reliable centering and thus a secure fit of the pipe.

The clamping ring cuts into the pipe surface and thus performs the function of holding the pipe in place. Thanks to its special, spring-like contour, it dampens vibrations from the pipe network.

The wedge ring provides a ring-shaped seal on the contact surfaces between the fitting and the pipe. The cone in the socket’s bore presses the ring onto the pipe, creating a constriction. This clamps the pipe securely in place, making it pressure-tight.

The u2-Lok compression fittings are very well suited for gaseous media. However, for every application, the complete application specifications—including the minimum operating pressure, medium, and temperature—must always be taken into account.

The 24° cutting ring fitting is a standardized fitting system that originated in the field of hydraulics. In the cutting ring system, a single cutting ring performs both the sealing and pipe-holding functions. The standard material used is 1.4571, and it is mandatory to pre-assemble the cutting ring onto the pipe.

The clamping wedge ring fitting, on the other hand, does not follow any standard and is designed with two rings. These fittings are particularly suitable for instrumentation applications, such as gas analysis systems, pressure measurement lines, or control lines. The design of the individual fitting components is therefore governed by the respective manufacturer’s in-house standards. The standard material used is 1.4404, and pre-assembly of the rings with the pipe is not necessary. 

For further information regarding the differences between the two fitting systems, please feel free to contact us at any time.

If you have any questions regarding your specific application, please contact your designated representative at Schwer Fittings.

All twin ferrule fittings are washed to remove all oil and grease and are delivered to you individually shrink-wrapped in a pre-assembled state. This means they are ready for immediate use and can be screwed onto the pipe. On-site installation training is available upon request.

Please be sure to follow our installation instructions under "→ Service → Installation Instructions".