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When introducing steam, backflow absorption occurs; the material used is demineralized water. Why is that? The steam is low-pressure steam
Make use of the principle of negative pressure generated by the steam flow rate; it’s better to use the previous schematic diagram for easier discussion.
This situation occurs only at the beginning of steam introduction, as the pipes are filled with low-temperature fluid; when steam enters the pipes at first, extensive condensation takes place, creating a negative pressure inside the pipes, and the drain valve then draws in air in the opposite direction； In a few minutes, it will gradually shift to positive pressure and then eject condensed water and steam ； None of this is a problem; the most important thing is to be careful to avoid water hammer in the few minutes after introducing steam.