M/s Opal Industries


Heatless Air Dryer

Heatless Air Dryer

A Heatless Air Dryer consist of two towers, which, alternately cycle on drying and regeneration. Each tower is filled with a bed of adsorbent desiccant. When one tower is on drying cycle, the desiccant adsorbs moisture from the incoming wet air stream and the other tower is on a regenerating cycle, which, a small portion of the super dried air passing through the desiccant to pick up and remove the adsorbed moisture, which is then vented to atmosphere. The towers are alternated in such a manner so that Dry desiccant is always in contact with wet compressed air, resulting in a continuous supply of Dry Air downstream.

The process is automatically reversed from one tower to another by a microprocessor based sequenced timer. Dryer must be protected against water and oil suspended in the form of drops or finely dispersed mist. If the risk for such condition exists, a high efficiency pre-filter must be installed before the dryer. In regular course a ceramic candle Pre-filter is installed prior to the dryer to take care of incoming dust, dirt and foreign particles.

By default a ceramic candle After-filter is installed after the dryer to take care of desiccant dust carry forward in the dry air. The Pearl make heatless dryer is capable of providing a -400C or lower atmospheric dew point and features a non-lubricated 3-way pneumatic switching valve. The operation is fully automatic and continuous without attention.

Features :

  • Pressure equalization : ensures dry air supply is continuous and at constant pressure.
  • Electronic Timer : Highly precise and fail-safe with excellent repeatability
  • Low Dew Point : Constant atmospheric dew point of - 40 C or below.


Instant dry air availability :

  • Easy to install & operate, requiring very few, low-cost spares.
  • Low Power Consumption : Approximately 50 Watts only.
  • Equipped with Silencers : low noise level.


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