5 Ausgabe 6/7–2024 HYDRAULIK what percentage is the cutting ring cut into during pre-assembly, and what percentage of the tightening path still needs to be applied in the final assembly of the connector, that is when it is in use?” Pure manual pre-assembly using a manual fitting works with an angle of rotation of 270° (3/4 of a revolution) once the pressure point has been reached (clearly perceptible increase in force) so that a further 90° needs to be applied – again once the pressure point has been reached. Old and outdated assembly strategies by different manufacturers allowed for preassembly angles of rotation of only 50%, which then required twice the angle of rotation during final assembly and so did not achieve the pre-assembly result required according to DIN 3859-2. “This can be difficult in many installation situations, whether in tight spaces or with overhead fittings. Generally the assembly wrench has to be moved multiple times. This takes extra time, which is already comparatively lengthy with manual assembly, but can be justified with smaller numbers where no major investment is needed in pre-assembly.” The entire tightening process is done using a conventional face spanner. And the union nut used is also a traditional DIN product. New: Portable unit for manual pre-assembly The Stauff Press range now includes a new portable tabletop unit for pressure-controlled cutting ring pre-assembly (in accordance with DIN 3859-2). The cutting ring is pre-assembled with an angle of rotation of 270° once the pressure point has been reached so that manual final assembly only requires 90°. André Degen: “Using our new pre-assembly unit, the pressure is manually and precisely set and read off using a high-quality Bourdon tube gauge. We recommend its use for small to medium quantities. It is beneficial with in-situ use that operation is purely manual and that no power supply is required.” The unit comes in a sturdy steel carrying case with room for all components. All the necessary parameters for tube diameters of 6 to 42 mm (Light Series) and 6 to 38 mm (Heavy Series) in steel and stainless steel are supplied. Mechanical cutting ring pre-assembly There are two versions of the Stauff Press cutting ring assembly machine available for the mechanical pre-assembly of large quantities with exceptional process reliability. The electrically-hydraulically driven Stauff Press assembly machine type SPR-PRC-MA assembles cutting rings in accordance with the standard. This sturdy table top-mounted unit is also capable of equipping tube ends with 37° flares. There is also a second highend solution. The Stauff Press cutting ring final assembly machine type SPR-PRC-POC provides for 100% “final” assembly of the cutting ring. Manual final tightening in the fitting body is only 30° or 1/12 revolution using the assembly André Degen looks after customers throughout Europe: “It is crucial on assembly lines whether a hydraulic pipeline system is leak-tight in operation.” The lightweight and ergonomically designed assembly machine is located in the sturdy trolley along with all components. A spare battery and charger are included in the set. Following manual preassembly with the portable table top-mounted unit, final assembly is only 90° once the pressure point has been reached. wrench. Mechanical final assembly therefore simplifies final assembly, saves time, and minimises the risk of errors (under and over-assembly) with final tightening in the fitting body. The most recent generation of the machine has a cloud connection with all the benefits associated with an online service: documentation, data analysis, software updates, error analysis etc.
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