Internal swaging system – general information
An internal swaging system was developed to provide permanent and safe fitting-hose connection. It ensures full and unrestricted flow through the fitting of a flexible hose assembly. The system utilizes a cold forming method – a mechanical method of fitting attachment. The key part of the system is a hardened, cone shaped swaging tool.
The diameter of the tool in its widest, working part is slightly bigger than the internal diameter of the fitting before crimping. The tool is pulled down the inside of the fitting so it expands to a desired diameter. The tail of the fitting compresses the hose against the ferrule. The internal swaging is opposite to traditional external crimping of ferrules as far as the process itself is concerned. The connection is achieved from the inside outwards, yet on the outside.
The main advantage of internal swaging over external crimping is the increase in a flow rate, because:
- when externally crimped, the hose tail of a fitting (inserted into the hose) reduces the flow diameter by the thickness of its wall;
- when internally swaged, the wall of the hose tail is entirely pushed into the hose. The inside flow diameters of both the hose and its fitting are the same Dw = Dk).
The bigger the flow rate, the shorter the reloading time – that makes the internal swaging method really cost-effective. Another advantage is the lack of obstacles and no turbulence at the tip of a hose tail which is crucial for the transfer of dry and loose or semi-fluid products (granules, grain, cement, concrete, etc.). The internal swaging system can be used for the majority of rubber industrial hoses from 2” (DN50) to 12” (DN300). It is particularly recommended for water and air hoses, fuels and other petrochemical products, delivery hoses for solids and for foodstuffs.