Permanent magnets in action
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The task of filtering out and separating ferromagnetic particles has occupied engineers intensively since the 30s. The man behind the technological know-how of RT-Filtertechnik, the world-famous Prof. Dr. Hans Thoma, already began work on magnetic filtration before the second world war. Although production technology has made enormous advances over the past decades, the proportion of ferromagnetic particles in hydraulic systems, for example, is so high that magnetic filters are still as important as ever. These filters have a wide range of applications, e.g. in the plastics, printing, automotive, food, metal, aviation and pharmaceutical industries - in short, wherever abraded metal is found in fluids. Nowadays, the permanent-magnet based hydraulic filter combines magnetic pre-filtration with a downstream mechanical micro-filtration stage. This combination allows an extremely high degree of purification, as the magnetic core absorbs not only ferromagnetic particles but also large quantities of fibres, casting sand, bronze chips or classical iron oxide with a particle size of up to 0.1 mm. There are two more good reasons for equipping filters with RT magnetic cores. Firstly, the specially designed RT bypass valve allows magnetic filtration to continue effectively even in critical situations where the micro-filtration stage is bypassed. Secondly, the magnetic filter is an important sensitising factor. Any maintenance specialist or machine operator who has ever inspected and cleaned a soiled magnetic core will readily understand why filters need to be serviced regularly and why the utmost care needs to be taken when filling the system with oil in the first place... |
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