Compressed Air Dryers & Filters

Bi-State Compressor is proud to offer Quincy and Deltech air dryers and filters to meet the needs of your facility. Designed to remove moisture from compressed air, these air dryers are manufactured to precise standards and represent the cutting edge in drying technologies. 

As compressed air cools, water vapor condenses and needs to be removed to prevent moisture and other harmful substances from damaging industrial processes. At Bi-State Compressor, we offer a complete array of products to keep your equipment running smoothly, including:

  • Refrigerated dryers
  • Dessicant dryers
  • Standard filtration: Particulate, Coalescer, and Absorber

At Bi-State Compressor, we offer the most innovative, reliable, and economical solutions for your industry. We’re happy to discuss your facility’s specific requirements and give you the best equipment available on the market today. If you need assistance determining which air dryer and filter system is right for your business, please call us at 636-349-8333 or fill out our contact form. We’re happy to help.

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Our compressors have been used in and more.

If you need assistance determining which industrial air compressor is right for your business
quincy compressor


The performance you demand. The reliability you can count on. Bi-State Compressor offers a variety of Quincy refrigerated air dryers and desiccant air dryers, as well as filters for effective removal of contaminants in your compressed air systems. Learn more about these products:Learn MoreRotary Screw Air Compressors

quincy refrigerated dryers

Refrigerated Dryers

Quincy Refrigerated Air Dryers purify compressed air by chilling it to approximately 37°F. This causes entrained moisture to condense. Condensed moisture carries airborne dirt and oil to the separator where it is removed from the air stream by an automatic drain.

quincy compressor

QPNC Series

quicy compressor ecodri blue machine

The QED and QPCD Series

quincy compressor blue machines

QRHT Series

desiccant dryers

Desiccant Dryers

Quincy desiccant dryers provide air purification from -40°F PDP down to -100°F PDP. These dryers are built and designed to provide the smallest footprint possible while ensuring maximum performance. Quincy desiccant dryers have ASME and CRN designed pressure vessels standard. Also, standard with the desiccant dryers is a 2-year package warranty and a 5-year valve warranty.


QHD Heatless Desiccant Dryer


QDHP Heated Purge Desiccant Dryer


QDBP Blower Purge Dessicant Dryer

quincy compressor black machines

QMOD Heatless Modular Desiccant Dryer

standard filters

Standard Filters

Quincy’s Standard Filtration lineup consists of the three most common types of filters used in compressed air systems: Particulate, Coalescer and Absorber. Aluminum housings with threaded NPT connections are used for flows up to 1530 cfm and steel housings with flanged connections are used for flows up to 16,500 cfm.


Quincy DCN and QPF Series


Quincy CSN and QMF, CPN and QCF Series


Quincy ACN and QAF Series



Deltech is known for being the first in many air compression technologies, such as the first multistage coalescing filter to remove oil, dirt and water in a single unit. Deltech sets the standard for the next generation of compressed air treatment products.

Bi-State Compressor offers a selection of Non-Cycling Refrigerated and Twin Tower Regenerative Desiccant dryers. Coalescing, Particulate, and Process Filters from Deltech.

deltech air dryers

Deltech Refrigerated Air Dryers

Refrigerated air dryers work by chilling the air to a temperature that causes the moisture in the air to condense and form droplets. This moisture and any contaminates contained therein can be separated from the air steam and discharged from the dryer. These dryers all have the same basic components to operate; a refrigeration system, heat exchanger, separator and drain. Although this technologies does not offer as low of a dew point as other dryers, this type of air dryer is quite popular due to their low initial capital costs, relatively low operating costs and low maintenance costs. They are quite versatile for many industries as the dew point range is well within many general industrial air plant applications.

The Deltech line of refrigerated dryers is specifically engineered for applications above the freezing point of water, each series is crafted to meet your compressed air treatment requirements. These units are equipped to handle flows ranging from 10 - 3000 scfm (17 - 5097 nm3/h) and are tailored to operate across multiple applications. All Deltech refrigerated dryers incorporate environmentally friendly refrigerants and hermetically sealed refrigeration compressors to guarantee reliability for the life of your unit. They also utilize fully automatic condensate drain valves tp ensure the lowest possible dew point under all rated design conditions - without freeze-ups, saving energy and adding value to your bottom line!


Refridgerated Air Dryers


High Inlet Temperature Air Dryers


Energy Saving Refrigerated Air Dryers

full deltech desiccant

Deltech Desiccant Air Dryers

The word desiccant air dryer encompasses a broad range of dryers. Regenerative dryer and twin tower dyer are other terms used to describe the same types of machines. Compressed air is passed through a pressurized vessel with two columns or towers. These towers are filled with materials such as activated alumina, silica gel, a molecular sieve or other absorbent or desiccant material, which attracts the moisture from the compressed air. The desiccant works to bring the pressure dew point of the compressed air to a level in which water will no long condense. In short the role of a desiccant dryer is to remove as much water from the air as desired in the most energy efficient manner possible. Deltech has been at the forefront of innovation and development in the desiccant dryer technologies. These energy efficient designs offer maximum value across a range of flow rates to provide flexibility, safety and reliability to meet all of your compressed air needs.

Every Desiccant Dryer contains these quality features:
• Highly hygroscopic desiccants combine spherical uniformity with superior crush strength to deliver stable dew point control and low dust migration
• Process quality switching valves deliver consistent repeatability to ensure system integrity and long component life cycles
• Precision timing circuits control process valve sequencing protocols to deliver optimum dew point stability and energy efficiency
• Calculated desiccant bed construction ensures ideal tower velocities to adsorb moisture, stabilize dew points, and prevent bed movement
• Spare muffler(s) are included on all models and sizes


Pressure Swing Heatless Desiccant Air Dryers


Heatless Desiccant Air Dryers


Externally Heated Desiccant Air Dryers


Blower Purge Desiccant Air Dryer


Heat of Compression Desiccant Air Dryers


Compressed Air Filtration Technologies

Bi-State Compressor is proud to offer Del-Monox air purifiers and other air filtration technologies to meet the needs of your facility. When used as directed, Del-Monox purifiers supply air that meets OSHA Grade D and Canadian Standards Association (CSA) maximum allowable contaminant levels for compressed breathing air. The quality of the inlet air to the compressor will affect the efficiency of the breathing air purifiers. The compressor intake must be located in an environment that is not oxygen deficient and does not contain excessive levels of carbon monoxide. To meet the OSHA standards of 10 ppm maximum allowable concentration of CO at the system outlet, CO at the inlet must not exceed 200 ppm. To meet CSA standards of 5ppm maximum concentration at the outlet, the inlet concentration must not exceed 100 ppm of CO.

In order to reduce the levels of CO, the Del-Monox system makes precise use of technology, utilizing catalytic conversion towers to change CO into CO2. This is a process that can be hampered when the relative humidity in the airstream increases, which is why every Del-Monox system is built with proven compressed air dehydration techniques to protect the catalytic converter from moisture.

The engineered system uses six stages of purification to ensure that air output achieves the required specified air quality levels.
  • Step 1: The one micron general purpose filter removes both solid and liquid contaminates.
  • Step 2: The 0.01 micron high efficiency coalescing type oil removal filter removes virtually all liquid oil aerosols.
  • Step 3: The Deltech Pressure Swing Regenerative Desiccant Dryer reduces the moisture levels to ensure the proper effective operation of the catalyst bed.
  • Step 4: The Catalytic Converter lowers the concentrations of CO by converting it to CO2.
  • Step 5: A particulate afterfilter removes contaminates one micron and larger from the airstream.
  • Step 6: Finally, the activated carbon filter removes oil vapor and any undesirable odors from the airstream.

Compressed Air Filter


Color Change Compressed Air Filters


Low Pressure-Drop Oil Coalescer to 0.001 ppm


Mist Eleminator