A heatless compressed air dryer is simplest form of gas or air dryer for achieving a dew point of -40 Deg C or better for compressed air systems and other gas and air dryer application process. Wet incoming compressed air after passing through pre filter passes through Angle piston valve assembly and is directed towards adsorption chamber where the compressed air passes upward through desiccant (activated alumina/molecular sieves).Compressed air drying takes place by adsorption. Dry compressed air from adsorption chamber is passes through non return valve assembly and then through the after-filter to the application or work area.

When compressed air is being drying in chamber,where the desiccant has been wetted in the previous cycle is being simultaneously regenerated. The chamber is depressurized to atmosphere through the purge valve in downward direction. A portion of dry compressed air passes through the needle valve/orifice plate through the desiccant and flushes out the desorbed mixture. When the regeneration is complete ,the purge valve is closed and tower is slowly repress rise to line pressure for a smooth changeover .A drying period of 5minutes provides an efficient dew point of-40 or better (at atmospheric pressure).