TPi July 2016

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56 TUBE PRODUCTS INTERNATIONAL 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.
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
The 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.
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.
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.
Leak-free and process-reliable cutting ring system:
VossRingM with VossRing pre-assembly stud
VossRingM for a perfect indentation along with maximum
pressure resistance and dynamic load bearing capacity