Quick couplings ensure clean and safe medium transport – Whether it is material transfer in the production plant, filling in containers or the loading and unloading of tank cars - quick couplings are the interfaces of liquid transport processes. But what is important when configuring or selecting such coupling solutions? From mono couplings to clean-break technology, specialists offer the right connection for each process - and incidentally “connect” the inconspicuous hose with IIoT-networks.n.
Hot or cold, under pressure or sterile conditions: Couplings provide the connection wherever media flow through hoses. Be it as a mono coupling, as a multi-module or a clean-break coupling with minimal dead room, they enable a secure connection and replacement of containers and systems. In any case, the right for is determined by the support media and conditions.
Duty of care is always paramount here - as, just for example, in the United States, more than 80 % of accidents with hazardous substances occur during filling or transferring. 24 % of these incidents can be traced back to equipment failure. And although the highest quality is required of hoses and pipes, care must be taken that the coupling is not pushed to breaking point.
The selection of a transfer device has to take a number of questions into account:
- How and in which position is the media transported?
- Is one cable connected, or more than one?
- Do weather or temperature bring special requirements?
- Which products are transported? Is heat or cold produced?
- Are they corrosive, flammable or explosive?
- What cleaning procedures are applied?
- Is the handling ergonomic?
In addition, requirements such as hygiene or sterile conditions must considered during coupling selection.
Particularly when liquids are transferred under high pressure or inflammable or toxic media are loaded, everything possible must be done to avoid even the smallest leakage. To this end, hose couplings are used which have almost no dead space or air inclusion. These so-called clean-break couplings are based on flat-face valves, which enables disconnection with minimal media loss.
This is also possible at high temperatures and high pressures, as the DD Series quick coupling of Walther Präzision shows. The components of this series, designed for high-temperature chemistry with operating pressures up to 250 bar are made of thermally and chemically resistant materials and can be used for critical gases and liquids up to 250°C.The smooth surfaces of the coupling, completely in stainless steel, enable easy cleaning and long running times. In addition, the design, with removable valves and replaceable O-rings, reduces the operating costs.
High-temperature processes, such as composite processing, also need suitable process equipment. Stäubli, with the quick coupler HTI and the multi-coupling system HTM, provides a solution for safe tool or product change up to 300 ° C. The design without an inner seal is decisive for this temperature resistance, according to the manufacturer. Here, the automatic shutoff of the circuits offers maximum safety for operators and the working environment when disconnecting the system.
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