Compact Heatless Regenerative Air Dryers :
| The requirement for clean, dry compressed air for today’s manufacturing and processing methods is more critical than ever. Moisture and particulate matter are found in all compressed air systems. These contaminants cause rust and corrosion damaging and increasing downtime of pneumatic tools, controls, and instrumentation. When applications require better dew points than can be achieved with refrigerated air dryers (35°F to 39°F) a heatless regenerative desiccant dryer should be utilized. -40°F to -100°F (-40°C to -73°C). At one time, compressed air dryers were luxuries. Today, as maintenance costs continue to rise, and the need for increased productivity grows, they’re a necessity in nearly every process where compressed air is used. The HY air dryer, together with its associated filters, is a key part of a well-engineered compressed air system. HY, an industry leader in the design and manufacture of innovative compressed air products, has developed the GXW Series -40°F to -100°F (-40°C to -73°C) pressure dew point Heatless Regenerative Desiccant Dryer to meet the ever-increasing demand for efficient and economical ultra dry compressed air. Our Compact Regenerative Pressure Swing Heatless Air Dryers, together with a broad range of high-efficiency filters, can provide total air treatment with outstanding reliability and performance for your compressed air applications. |
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Features and Benefits
·Compact, modular design with few moving parts for long term reliability.
· Automatic regenerative operation and no regular maintenance required.
· Available in multiple voltages. Low power consumption.
· PLC cycle timer for reliable purge cycle timing.
· Desiccant chambers are spring-loaded for long life and optimum performance.
· Purge mufflers are standard for quiet operation.
· Space-saving wall-mount bracket is standard.
· Repressurizing timer for minimal downstream flow and pressure fluctuation during tower switch over.
· Easy change when different purge flows are required.
· The total cycle time may be choosed by one,two,five or ten minutes.
· All material is stainless steel.
· Designed to accommodate optional system components and dryer accessories without modification. |
Dryer Operation
The heatless air dryers utilize two symmetrical desiccant towers. The wet air enters the dryer and flows through one of the towers where nearly all the water vapor is adsorbed. In the flow schematics shown below, the right tower is being regenerated while the left tower is drying the wet inlet air. Inlet air flow direction is controlled by the solenoid valves. As shown below, Valve B is open and valve A is closed, which allows the inlet shuttle valve to direct the air to the left tower. A portion of the dry air is allowed to flow through an purge flow adjusting valve into the right tower. The dry air flowing through the adjusting valve expands to nearly atmospheric pressure, which dries the purge air still more. This very dry air extracts the water from the desiccant as it flows through the right tower and out the solenoid valve exhaust port. The adjusting valve are fixed and are sized by the factory, based on flow and pressure. A elecrical timer controls the cycling of the solenoid valves. After a set period of time, the procedure is reversed. The wet left tower is being regenerated, while the right tower is drying the wet inlet air. During each cycle, the desiccant towers are either drying the wet inlet air or being reactivated with dry air from the drying tower. The total cycle time may be choosed by one,two,five or ten minutes. |
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How to Select a GXW Series Heatless Air Dryer
Proper selection of a GXW heatless air dryer depends on knowing the inlet pressure, outlet flow and inlet temperature. Note: Maximum inlet temperature is 100°F. All models have a 40–150 PSIG operating pressure rating. |
Example:
Application: Calls for 20 SCFM outlet capacity at -40°F pressure dew point, and 100 PSIG operation pressure at 70°F inlet temperature.
Selecting Model for Application: On the model selection listing below, locate the 100 PSIG inlet pressure and find 25.0 SCFM inlet flow, subtract 4.9 purge flow, shown under purge flow column. For the 20 SCFM application, the model GXW2-0.6/1 meets the requirements. |
-40°F Outlet Pressure Dew Point
| GXW |
SCFM Inlet Flows @ Indicated Inlet Pressures
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PurgeSCFM
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40
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50
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60
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70
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80
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90
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100
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110
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120
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130
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140
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150
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70°F
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100°F
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0.1/1
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1.3
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1.6
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1.8
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2.1
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2.3
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2.6
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2.8
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3.0
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3.3
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3.5
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3.8
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4.0
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.7
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.8
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0.15/1
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2.7
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3.3
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3.8
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4.3
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4.8
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5.3
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5.8
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6.3
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6.8
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7.3
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7.8
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8.3
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1.5
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1.7
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0.2/1
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3.8
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4.5
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5.2
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5.9
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6.6
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7.3
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8.0
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8.7
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9.4
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10.1
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10.8
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11.5
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2.2
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2.5
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0.3/1
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6.6
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7.3
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8.0
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8.7
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9.4
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10.0
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10.6
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11.3
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12.0
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12.7
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13.3
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14.0
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2.7
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3.0
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0.4/1
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7.4
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8.8
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10.2
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11.5
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12.9
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14.2
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15.6
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17.0
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18.3
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19.7
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21.0
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22.4
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2.8
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3.1
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0.6/1
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11.9
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14.1
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16.3
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18.5
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20.6
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22.8
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25.0
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27.2
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29.4
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31.5
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33.7
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35.9
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4.9
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5.6
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0.9/1
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15.3
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18.6
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21.9
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25.2
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28.4
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31.7
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35.0
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38.3
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41.6
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44.8
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48.1
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51.4
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5.6
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7.8
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1.2/1
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23.8
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28.2
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32.6
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36.9
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41.2
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45.6
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50.0
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54.4
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58.8
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63.0
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67.4
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71.8
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9.8
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11.2
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·Flow rates based on 70°F (21.1°C) inlet temperature.
·To determine SCFM inlet flow for -100°F atmospheric dew point, multiply inlet flow on chart above by 0.92. |
Heatless Air Dryer Recommended Filtration and Installation
HY offers a complete line of air preparation products consisting of prefilters, coalescing filters, and afterfilters to match the performance of the dryer selected. Each type or combination of filters provide a different degree of air quality, dependent on your application needs. These filters will remove virtually all contamination from the compressed airflow including bulk liquid water and oil, solid particles, oil aerosols, oil vapors and oil associated odors.
Prefilter – The LN35 inlet filter is a 3 micron, reusable element that will remove solid contaminants and bulk liquids. This filter should also be used as a prefilter for the LN12 (oil removal) filter.
Oil-Removal Filter – The LN12 high efficiency coalescing filter removes particles and extremely fine oil mist and aerosols down to 0.01 microns. Filter oil removal efficiency is better than 99.9999% resulting in a maximum remaining oil content downstream of the filter of less than 0.01 ppm/wt.
Afterfilter – The LN24 filter is a 1 micron filter that will remove solid contaminants, such as desiccant dust from migrating downstream. The Afterfilter is designed for use in “dry” systems where it provides efficient removal of desiccant dust and other solid contaminants downstream of various types of chemical dryers. |
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Model Number
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Pipe Size
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Recommended*
Prefilter
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Recommended**
Coalescing Filter
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Recommended
afterfilter
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GXW*--0.1/1
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1/4”
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LN35-0.5/1
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LN12-0.5/1
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LN24-0.5/1
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GXW*--0.15/1
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1/4”
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LN35-0.5/1
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LN12-0.5/1
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LN24-0.5/1
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GXW*--0.2/1
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1/4”
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LN35-0.5/1
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LN12-0.5/1
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LN24-0.5/1
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GXW*--0.3/1
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1/4”
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LN35-0.5/1
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LN12-0.5/1
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LN24-0.5/1
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GXW*--0.4/1
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1/2”
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LN35-1/1
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LN12-1/1
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LN24-1/1
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GXW*--0.6/1
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1/2”
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LN35-1/1
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LN12-1/1
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LN24-1/1
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GXW*--0.9/1
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1/2”
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