TPi July 2016

New cutting ring system: a cut above the rest Article supplied by Voss Fluid, Germany

The ring of rings The basis of the intelligent solution is the VossRingM. The optimised twin-cutting technology ensures a perfect indentation and firm fit at the tube, even for thin-walled tubes. The stable cutting ring cross-section along with other geometric details guarantee the highest pressure resistance and dynamic load bearing capacity. That means the ring can withstand pressures of up to 800 bar at a fourfold safety factor without any problem. FEM-optimised rounding of the cutting ring reduces the risk of damage to the stud and effectively prevents the tubes from rotating during assembly. In theory, cutting ring systems guarantee safety, and ensure leak-free tube connections in hydraulic systems. In practice, a process-reliable fitting has almost always depended on the fitter’s experience and concentration. To overcome these less than adequate circumstances, Voss Fluid has developed an assembly-reliable system: the VossRingM with VossRing pre-assembly stud. The patented solution for connecting steel and stainless steel tubes is easy to handle and enables even inexperienced or fast-turnover personnel to achieve precise pre- and final assembly. Process-reliable pre-assembly with limit stop function Yet completion of the VossRingM did not mark the end of the project. “What use is the best ring,” said Gerd Berghaus, product developer at Voss Fluid, “if the error sources during assembly can be as diverse as the people installing it?” To eliminate this safety gap with an effective design, the company has developed a reliable assembly tool: the VossRing pre-assembly stud. The solution prevents assembly T he perfect cutting ring tube fitting is reliable when it comes to leaks and processes and offers maximum load and pressure resistance, while preventing system- inherent assembly errors. Voss Fluid has brought out a solution that combines all these advantages in a single cutting ring system, enabling even inexperienced fitters to achieve precision work.

Leak-free and process-reliable cutting ring system: VossRingM with VossRing pre-assembly stud

errors by signalling the exact end point of the pre-assembly to the fitter via an unmistakable increase in force. Once the assembly is completed, the stud comes into contact with a definite locating surface at the end point of the ring. This means the assembly process is finished at the optimum point – an excessive assembly is effectively prevented. Besides the highest level of safety, the new stud also makes the fitter’s work easier: the sophisticated geometry of the tool in the tube limit stop range reduces the final assembly route from 90° to 30°, thereby decreasing the work to be performed by the fitter by around half. This advantage is especially apparent under difficult installation conditions.

VossRingM for a perfect indentation along with maximum pressure resistance and dynamic load bearing capacity

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TUBE PRODUCTS INTERNATIONAL July 2016

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