N/A 1. Three Controllers to choose from

N/A Gardner Denver DGH Series Heatless Desiccant Dryers were designed to help you meet your goals. Customizable performance technology is integrated into our standard product so it can be tailored to benefit your specific critical compressed air drying application. Now, you have the liberty to personalize the performance of the standard product to adapt to your specific needs.

Variations in demand, pressure dew point, compressed air purity, and hours of operation have often forced engineers to compromise energy efficiency and system performance for an “off-the-shelf” product. Well…not anymore.

The DGH series offers three controller styles to meet every application.

Basic Controller:

N/A DGH Series Heatless Desiccant Dryers open up a world of customizable performance opportunities with four standard ISO quality class levels of pressure dew points to choose from. Don’t settle for less than the ability to satisfy all of your requirements for clean, dry compressed air. Maybe you need low dew point protection to prevent winter freeze-ups and are satisfied with higher dew points the rest of the year. Simply press the dew point selector button to select a new dew point level that is best for you. The custom-built performance of the DGH Series can be tailored to meet the most critical of applications…yours.

N/A DGH Series Heatless Desiccant Dryers and FIL Series Filters provide “critical use” applications of compressed air with a highly engineered quality air treatment system. “Critical uses” of compressed air have zero tolerance for contaminants whose presence will lead to manufactured product spoilage and rejection from a quality assurance standpoint. A carefully engineered desiccant dryer design provides a reliable method to remove moisture as a water vapor while coalescing filters remove solid particles, liquid water droplets, liquid oil and oil vapors from the compressed air system.

DGH Series Dryers offer Pressure Dew Points to -100°F (-73°C)

Moisture (water vapor) is present in ambient air as a gas and cannot be filtered. Adsorbents present in the DGH Series remove water vapor to prevent it from condensing into harmful liquid water droplets inside compressed air systems. Microelectronic and pharmaceutical manufacturing are examples which cannot tolerate the presence of any moisture.

FIL Grade E Series Coalescing Filters Remove Water Droplets and Solid Particles to 0.01 Micron

Water droplets are formed by the condensed water vapor present in ambient air. Solid particles come from ambient air contaminants like dust and from rusted, oxidized pipework. They can cause pneumatic equipment to malfunction and trigger instrument and control failures.

FIL Grade D Series Filters Remove Oil and Oil Vapors for Oil-Free Air

Liquid oil and oil vapors are introduced by compressor coolants and by hydrocarbon vapors present in ambient air. Oil-free compressed air is particularly important in food and pharmaceutical processes where direct and indirect contact with compressed air occurs. Oil contamination of food and drug products can generate significant liability issues and manufacturing spoilage costs.

N/A How It Works
Moist, filtered compressed air enters the pressurized on-line desiccant filled drying Tower 1 through the shiftmatic valve (A). Up-flow drying enables the desiccant to strip the air stream of moisture. Clean, dry compressed air exits through the shiftmatic valve (B) to feed the air system. Tower 2 (when in regeneration mode) depressurizes to atmosphere through muffler (C) when valve (D) opens. A portion of dry compressed air (purge air) is diverted before exiting (B) and passes through off-line Tower 2 and exits at valve (D) to desorb the moisture from the desiccant. Once desorbed, valve (D) closes and Tower 2 is repressurized. At tower shift-over, valve (E) will open, causing the shiftmatic valve (A&B) to shift. Tower 2 will be placed on-line to dry the bed. Operations will switch and Tower 1 will be regenerated.

Reliable valves are critical to dryer performance; that is why we use a proprietary shuttle-style switching valve in lieu of off the shelf plug, ball, butterfly, and diaphragm valves. The “Shiftmatic” is so reliable that we offer a 5-year warranty on models DGH 40-3000 with use of a properly sized FIL prefilter.

The shiftmatic valve has one moving part, no maintenance, no check valves, aluminum housing and nylon shuttle.

N/A Basic Controller
The basic controller offers basic fixed cycle operation.

N/A Energy is consumed in the form of purge air to prepare the “off-line” desiccant tower for its next cycle of operation by a process called regeneration. You have the ability to optimize your purge air consumption to achieve energy savings that will pay you dividends for many years to come. The following describes variations in plant operations that dictate which Controller selection may deliver your best value.

Standard Purge Optimizer Savings:
Facilities operating at a constant level of air demand benefit the most from the Purge Optimizer feature. Ordinary heatless dryer designs offer zero purge air savings. The Purge Optimizer allows you to select purge air savings of 10%, 20%, 30%, 40%, 50%, 60% or 70% of inverse proportion to your air demand. For example, you can elect to save 30% of your purge air costs if your maximum air demand is 70% of full rated capacity; 40% savings at 60% load, 50% at 50% and so on. This feature is invaluable if your maximum load levels remain fairly constant and you are on a limited budget.

Optional Energy Saving Controller:
Events as transparent as lunch and coffee breaks represent energy saving opportunities that typically reflect 19% of every shift’s working hours. Add in production changes and machine down time and there are more valleys than peaks on the demand chart. This patented Controller uses thermistors to carefully monitor the natural temperature changes that occur during each drying and regeneration cycle. The Controller acts on that data to precisely manage your system’s purge air needs. No intervention is required on your part. Maximum energy efficiency is achieved. You save up to 84% on purge air energy costs…automatically.

N/A Gardner Denver FIL Series Filters complete the integrity of your critical use air treatment system and are available in a variety of sizes and grades. Compressed air quality and desiccant bed life are dependent on clean compressed air. Compressed air must be prepared prior to entering the desiccant dryer.

Normal installations could include an FIL Series Grade C (1 micron solid particles) prefilter followed by an FIL Series Grade E or Grade F oil removal filter. Grade E (to 0.008 ppm) filters are used for ISO 8573.1 Class 2, 3 or 4 requirements. Grade F (0.0008 ppm) satisfies the needs of Class 1 pressure dew points. An FIL Series Grade D (1 micron, reverse-flow) particulate filter is the right choice for installation after the dryer to collect the fine desiccant dust and prevent it from migrating downstream. Then, if it is technically oil-free air you need, complete the filter system with a Grade G Oil Vapor Removal Filter.

Operational Security with the ELEMENT MONITOR
Heightening the operational security of your FIL Series Filters is as simple as specifying you want the optional Element Monitor included with each filter you order. Rely on your Gardner Denver Distributor to assist you in selecting the best combination to satisfy your specific requirements.