Operation of the AD-4AIR Dryer | BENDIX BW1450 specification

CHECK

VALVE

ORIFICE

PURGE VOLUME

DESICCANT

CARTRIDGE

DESICCANT

BED

OIL SEPARATOR

CHECK

VALVE

DELIVERY

PORT

HEATER	EXHAUST
	PORT	CONTROL	COMPRESSOR
	PURGE	GOVERNOR
	PURGE
	VALVE
	SUPPLY RESERVOIR

FIGURE 2 - AD-4™AIR DRYER CHARGE CYCLE

OPERATION OF THE AD-4™AIR DRYER

The AD-4™air dryer alternates between two operational modes or “cycles” during operation: the charge cycle and the purge cycle. The following description of operation is separated into these “cycles” of operation.

CHARGE CYCLE (refer to Figure 2)

When the compressor is loaded (compressing air) compressed air, along with oil, oil vapor, water and water vapor flows through the compressor discharge line to the supply port of the air dryer end cover. The flow velocity or the speed at which the air and its contaminants travel down the discharge line is reduced substantially as it enters the air dryer end cover baffle system behind the supply port. As air travels through the baffle system, its direction of flow changes by 180 degrees several times, reducing the temperature, causing contaminants to condense and drop to the bottom or sump of the air dryer end cover.

After exiting the end cover baffle system, the air flows into the desiccant cartridge. Once in the desiccant cartridge air first flows through an oil separator which removes water in liquid form as well as oil, oil vapor and solid contaminants.

Air exits the oil separator and enters the desiccant drying bed. Air flowing through the column of desiccant becomes progressively dryer as water vapor adheres to the desiccant material in a process known as “adsorption”. The desiccant cartridge using the adsorption process typically removes 95% of the water vapor from the pressurized air.

The majority of dry air exits the desiccant cartridge through its integral single check valve to fill the purge volume between the desiccant cartridge and outer shell. Some air will also exit the desiccant cartridge through the purge orifice adjacent to the check valve.

Dry air flows out of the purge volume through the single check valve assembly and out the delivery port to the first (supply) reservoir of the air system.

The air dryer will remain in the charge cycle until air brake system pressure builds to the governor cutout setting.

PURGE CYCLE (refer to Figure 3)

When air brake system pressure reaches the cutout setting of the governor, the compressor unloads (air compression stopped) and the purge cycle of the air dryer begins. The

BW1450 specifications

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