FIELD: drainage-distributing devices.
SUBSTANCE: invention relates to drainage-distributing devices of filters with granular or bulk loading used for purification of fluids, including in water treatment systems. Method of making filter element includes making, in metal tubular body, of slots 2 extending inward from its outer surface 3 by laser beam 7 in two passes with change of inclination angle of laser beam to 45° in each side from perpendicular to generating surface of tubular body.
EFFECT: easier manufacture, higher reliability and durability of the filter element.
8 cl, 3 dwg
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