Van Air HB series blower purge regenerative compressed air dryers process larger volumes of compressed air economically, using no compressed air to regenerate the desiccant bed. An externally mounted blower and heater drives hot atmospheric purge air through the desiccant in the off stream tower. A -40°F protects critical equipment and processes.

All Van Air HB series dryers include: fully jacketed insulation on both towers and heater for greatest safety and operating efficiency; a centrifugal blower (3000 scfm and up); Interlock Logic valve control; failure to switch/purge alarm and contact; and polishing purge selector to minimize dew point spikes.

Principle of operation: Wet compressed air is directed through the drying tower where moisture is adsorbed on the desiccant. In the regenerating tower, moisture is stripped from the desiccant by atmospheric air drawn in through the blower and passed over the heater. As the hot purge air flows through the bed, it collects moisture and is discharged through the purge valve(s). The eight-hour NEMA cycle includes four hours of drying, three hours of regeneration and one hour of cooling per tower.