hydraulic experts come in. Stauff Engineering recommends the strongest tube connection system Stauff Form EVO in view of the strong vibrations and permanent pressure shocks experienced. The lift is operated up to 1000 times in a 8-hour shift in a residential area, with most of the vibrations occurring when the bins are knocked out. The principle: the Stauff Form EVO machine is used to reshape the tube end so that a so-called positive connection is created during fitting with a conventional fitting body and a union nut. The only conceivable leakage path is additionally secured with a Viton seal. Unlike a forming system, a cutting ring connection is produced when a metal ring with two edges cuts – as the name already indicates – into the tube surface when a union nut is tightened. This incision into the material limits the vibration resistance. The forming system, on the other hand, has a higher tearout strength, which adds to safety under extreme conditions – strong pressure surges and vibrations as experienced in the refuse collection vehicles. Manufacturers are increasingly relying on the explicit recommendations of the Stauff experts to prevent fires or traces of oil caused by leaking oil. CLAMPS REDUCE VIBRATIONS AND NOISE Stauff recommends the use of NRC clamps (noise reduction clamps) to reduce the noise level in the hydraulic line systems of the refuse collection vehicles. These special clamps, which are used to attach tubes, for example, to the machine housing, have a specially shaped two-piece elastomer insert, which is integrated into the polypropylene or polyamide clamp body. It decouples the tube from the surrounding construction, minimising the transmission of vibrations in both directions, and noticeably reducing the noise level. NRC clamps are compatible with standard steel and stainless steel fastening accessories. This means that the accessories do not need to be replaced when converting to NRC clamps in production. The contribution of these clamps to reducing noise seems rather insignificant in view of the often heavy and large vehicles 05 The Stauff Form EVO machine shapes the tube end so that a positive connection is created during fitting with a conventional fitting body and a union nut HYDRAULIC LINE SYSTEMS www.oup-fluidtechnik.de O+P Fluidtechnik 2024/11-12 with internal combustion engines. But on the one hand, with 40 metres of hydraulic tubes and 60 metres of hose lines, we are talking about a rough estimate of up to 100 fasteners. On the other hand, waste disposal companies are increasingly converting their fleets to electric or hybrid-powered vehicles, so that every decibel that can be saved becomes even more important. Small, manoeuvrable vehicles have long been used in the narrow streets of old towns, pedestrian zones or car parks. COMPACTLY AND SECURELY FASTENING LINES While Twin Series standard clamps are capable of securing a maximum of two lines per clamp body, Stauff MLC clamps (multi-line clamps) have been designed to hold up to six lines with identical or different diameters. This is of particular interest for use in refuse collection vehicles: MLC clamps are suitable for use with tubes, hoses or cables. As mentioned above, the electrical „nerve system“ of a standard refuse collection vehicle can be up to 100 metres long. Tubes and hoses are often routed in parallel. Considerably less installation space or fastening surface is needed to secure the same number of cables using MLC clamps. One example to illustrate this: The total length of a clamp for six size 3 cables is only 216 mm. Six DIN Standard Series clamps arranged side by side require 300 mm. The number of components required is also lower, not just the number of clamps required. There are also fewer other components needed to securely fasten hydraulic lines: cover plates and weld plates, rail nuts, safety locking plates, stacking bolts, other adapters and other accessories. The fewer components that need to be attached, screwed and welded, the shorter the installation time and the lower the risk of installation errors. With the Stauff Multi-Line clamps, up to six lines with different outside diameters can be secured on request. Images: Aufmacher: Zoeller; image 01: Jan Kliment – stock.adobe.com; others Stauff www.stauff.com
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