HD-Series heatless dryers from Perma Pure are regenerative, compact compressed air dryers. Unlike similar heatless dryers, they provide a continuous, steady flow of dry air without pressure pulses, and periodical replacement of the desiccant is unnecessary. Very ruggedly constructed, they operate for years without maintenance or repairs.
HD-Series heatless dryers are ideal for low flow air drying operations. Operation is fully automatic, and outlet dew points as low as -50 °C can be achieved. They consist of two chambers filled with a highly absorbent desiccant. One chamber dries the gas stream while the opposite chamber is regenerated.
No momentary drops in pressure occur as the gas flow is switched. The valve on the regenerating chamber is closed shortly before switchover. This enables it to recover to full pressure before use. In addition, the desiccant is protected from damage caused by the alternating air flow. It is very tightly packed and compressed so that it cannot move and break down. This normally ensures at least ten years between fillings.
There are two models available. The 18 cm model is best for flows under 60 l/min. The 30 cm version is recommended for flows of up to 90 l/min.
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