In a desiccant air dryer, water vapor is removed from compressed air by passing it over a bed of adsorbent desiccant material. As the air contacts the adsorbent material, water vapor transfers from the wet air to the dry desiccant.

Adsorbent materials have a fixed adsorption capacity and once this capacity is reached, they must be either regenerated or replaced.

We handle both single and twin tower Desiccant Dryers.

Single Tower desiccant  dryers utilize a single canister of desiccant that must be replaced or regenerated once it has reached its saturation point.

Twin Tower desiccant dryers utilize two canisters of desiccant material  material and through a series of switching valves, back flow a portion of the dry air to regenerate the opposite canister.

There are two main types of desiccant media; Activated Alumina, generally used in twin tower dryers and Silica Gel, generally used in single tower dryers, and often containing a coloring agent that turns from blue to pink when saturated with water.

A third type of single tower dryer (Not sold by Bishop Industrial) uses a deliquescent, generally salt crystals that dissolve into brine that must be disposed of, as they absorb moisture from the air.