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The second chamber is depressurized downward to ambient pressure by the purge valve. As a piece of the desiccant passes through the needle valve or orifice plate, a portion of the dry compressed air flushes the desorbed moisture out. As the regeneration is finished, the purge valve closes, and the tower gradually depressurizes to line pressure, ensuring a seamless changeover. A 5-minute additional drying period at atmospheric pressure results in an effective dewpoint of -40u00b0C or even better. The re-pressurization phase of the regeneration process only lasts about 60 seconds. This idea underlie
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