The present invention relates to a multi-stage de-aerator, and since the multi-stage de-aerator has not been conventionally used, the defoaming effect is lowered.;As shown in Fig. 5, the present invention is characterized in that, in the deaerator main body 4 of a deaerated package, a cross-flow type flow plate 5 is provided, and on the outer surface of the flow plate 5, a plurality of step-) Is formed in a multi-stage deaerator.
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