DN-märgistus koosneb tähtedest DN, millele järgneb täisarv, mis on kaudselt seotud torude otsaühenduste avade või välisläbimõõdu mõõtmetega millimeetrites.
DN-designation comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections.
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