| Operations |
- Saturated compressed air enters the bottom of the dryer and flows through an inlet valve into the bottom of
tower 1.
- As the air travles through the desiccant it is dried and exits via the stainless steel screen and through the
discharge check valve.
- A small amount of very dry air (-40 degrees F to - 100 degrees F dew point) is deverted through the purge
orifice and throttled near atmospheric pressure down through tower 2. This very dry low pressure purge air
regenerates the desiccant in tower 2 by carrying off the water collected during the drying stage. Purge air
then exhausted through the purge exhaust valve and oversized muffler.
- After regeneration the purge exhaust valve closes and fully pressurizes tower 2 to line pressure prior ro going
on line. (Larger models are equipped with repressurization valves.)
- The inlet valve opens allowing saturated compressed air to flow up through tower 2 to be dried while tower 1
is being regenerated.
- The microprocessor controller is progammed with three cycles and field switched at the control panel. The 10
minute cycle achieves a dew points of - 40 degrees F. The five minute cycle will achieve dew points of - 100
degrees F. The third cycyle is a 1.5 minutes test cycle used for diagnostics.
- Non lubricated air operated switching valves are used for maximum reliability, reduced maintenance and ease
of serive.
- Each tower is filled with activated alumina desiccant. It has been designed exclusively for use in dryers. With
its inherent ease of desoption and regeneration the average life cycle is 5 years. This is based on proper
prefilter design and maintenance.
| Operations of the Desiccant Air Dryer |
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