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A heatless compressed air dryer is the simplest form of gas or air dryer for achieving a dew point of -40^o C or better for compressed air systems and other gas and air dryer applications.

Process : Wet incoming compressed air after passing through pre filter passes through the slide piston valve assembly and is directed towards absorber chamber i where the compressed air passes upward through the desiccant ( activated alumina / molecular sieves ). Compressed air drying takes place by adsorption. Dry compressed air from absorber chamber i then passes through the check valve assembly and then through the after- filter to the application or work area. while compressed air is being drying in chamber the desiccant 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 the downward direction. A portion of the dry compressed air passes through the needle valve / orifice plate through the desiccant and flushes out the desorbed moisture. when the regeneration is complete, the purge valve is closed and the tower is slowly repressurise to line pressure for a smooth changeover. A drying period of 5 minutes provides an efficient dew point of -40^o C or better (at atmospheric pressure ). In regeneration process approximately 30 seconds are required for repressurization.