GASOLINE
DRIVEN

HORIZONTAL
TANK MOUNT

DUPLEX COMPRESSORS

ELIMINATE DOWNTIME, REDUCE YOUR POWER COST
with a duplex curtis air compressor

Call Dockendorf today with your air compressor needs.
Curtis has Gas, Electric, Single, Two stage and Screw style compressors

Air Dryers-
Curtis has the best

"FOR A CLEAN, DRY COMPRESSED AIR SYSTEM"

SYSTEM RELIABILITY

Curtis Air Dryers have been protecting climate control, automotive and industrial air systems for many decades.

• 38F pressure dew point removes troublesome moisture to extend equipment life
• Fully automatic operation saves money by adjusting to system needs without complicated controls
• High efficiency tube on tube heat exchangers minimize power usage
• Moisture separator with non-clogging condensate drain automatically removes moisture

STANDARD FEATURES

Easy to install compact package saves valuable floor space and allows for quick installation.

• Light on-off switch
• Dew point indicator on models CR25 - CR425
• Non clogging float drain on model CR10
• Non clogging timer drain on models CR15 - CR425
• Environmentally friendly R-134a refrigeration system, CFC-free
• Reheated outlet air eliminates cold sweaty piping

"PERFORMANCE THROUGH DESIGN"

MINIMUM PURGE AIR USED, QUIET OPERATION
By saving the heat of adsorption our design maximizes the purge air's ability to carry off moisture in a counterflow arrangement. Our base mounted models use only 13.7% PURGE AIR, the LOWEST IN THE INDUSTRY. All units come with heavy duty purge exhaust mufflers.

SOLID STATE CONTROLLER
Maintains precisely accurate 10 minute cycles to achieve pressure dewpoints of -40F(-40C). Unit is also field adjustable for 4 minutes cycles if -100F(-73C) dewpoints are required. Off-line tower fully repressurizes before going on-line preventing downstream pressure loss.

DURABLE AIR CONTROL VALVES
Soft seated, self-sealing control valves are extremely reliable and ensure complete closure with minimum wear. No field lubrication required.

LONG LIFE ACTIVATED ALUMINA DESICCANT
Large bed size along with slow and complete regeneration of offline tower prevents fluidization, desiccant movement and deterioration. This ensures maximum desiccant life. Activated alumina also has high crush strength and is abrasion resistant.

OPTIONAL THERMOSAVE PURGE SAVING SYSTEM
Available on models CDH-25 through CDH-5400. Microprocessor automatically matches purge air usage to dryer load capacity for additional energy savings. Device monitors changes in desiccant bed temperature. Example: at 50% dryer load, only 50% of normal purge air is used and a tower is able to stay on line for 10 minutes instead of the usual 5. Temperature sensors require no calibration.

Curtis CDH SERIES
Heatless / Pressure-Swing, Twin Tower Desiccant Dryers produce consistent outlet pressure dew points down to -100F(-73C) for ultra-dry air.

OPERATION SEQUENCE
1) Wet, compressed air enters the bottom of dryer and is directed up through tower 1 by an inlet switching valve.

2) Air is dried and then directed to top outlet port through check valve.

3) A small portion of dry discharge air is diverted through a purge orifice and throttled near atmospheric pressure back down into tower 2. This dry low pressure purge air regenerates the desiccant in tower 2 by carrying off the water collected during the drying stage.

4) Purge air is then exhausted to atmosphere out the bottom of tower 2 through a pruge/repressurization valve and purge muffler.

5) After regeneration the purge/repressurization valve closes and fully pressurizes tower 2 to line pressure before going back online.

6) Inlet switching valve then opens to direct wet compressed air up through tower 2 to be dried while tower 1 is being regenerated.