BENDIX BW1450 manual Preventive Maintenance, AD-4AIR Dryer Purge Cycle

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CHECK

VALVE

ORIFICE

PURGE VOLUME

DESICCANT

CARTRIDGE

 

 

DESICCANT

 

 

BED

CHECK

 

OIL SEPARATOR

 

 

VALVE

 

 

DELIVERY

 

 

PORT

 

 

HEATER

EXHAUST

 

PORT

 

 

COMPRESSOR

 

CONTROL

PURGE

GOVERNOR

 

VALVE

 

 

 

SUPPLY RESERVOIR

 

 

 

 

FIGURE 3 - AD-4™AIR DRYER PURGE CYCLE

 

 

line connecting the governor unloader port to the AD-4™air dryer end cover control port is pressurized when the governor unloads the compressor. Air pressure at the AD-4™air dryer end cover control port is also present on the purge valve piston. The purge piston moves in response to air pressure causing the purge valve to open to atmosphere. Contaminants in the end cover sump are expelled immediately when the purge valve opens. Also, air which was flowing through the desiccant cartridge changes direction and begins to flow toward the open purge valve. Oil, water and solid contaminants collected by the oil separator are removed by air flowing from the desiccant drying bed to the open purge valve.

The initial purge and desiccant cartridge decompression lasts only a few seconds and is evidenced by an audible burst of air at the AD-4™air dryer exhaust.

The actual reactivation of the desiccant drying bed begins as dry air flows from the purge volume through the desiccant cartridge purge orifice and into the desiccant drying bed. Pressurized air from the purge volume expands after passing through the purge orifice; its pressure is lowered and its volume increased. The flow of dry air through the drying bed

reactivates the desiccant material by removing the water vapor adhering to it. Generally 15-30 seconds are required for the entire purge volume of a standard AD-4™air dryer to flow through the desiccant drying bed.

The end cover single check valve assembly prevents air pressure in the brake system from returning to the air dryer during the purge cycle. After the 30 second purge cycle is complete, the air dryer is ready for the next charge cycle to begin.

The purge valve will remain open after the purge cycle is complete and will not close until air brake system pressure is reduced and the governor signals the compressor to charge.

PREVENTIVE MAINTENANCE

Important: Review the warranty policy before performing any intrusive maintenance procedures.An extended warranty may be voided if intrusive maintenance is performed during this period.

Because no two vehicles operate under identical conditions, maintenance and maintenance intervals will vary. Experience is a valuable guide in determining the best maintenance interval for any one particular operation.

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Contents Port l.D Function/Connection DescriptionOperation of the AD-4AIR Dryer Charge Cycle refer to FigurePurge Cycle refer to Figure AD-4AIR Dryer Purge Cycle Preventive MaintenanceAD-4AIR Dryer Sectional View Operation & Leakage Tests Every 10,800 hours or 300,000 miles or 36 monthsRebuild the air dryer including the desiccant cartridge Maintenance Kits Available Rebuilding the AD-4AIR DryerGeneral AD-4AIR Dryer Assembly AD-4AIR Dryer Removal DisassemblyAssembly Cleaning & InspectionThermostat Disassembly Refer to Figures Vehicle Application Requirements RE-INSTALLATIONTotal Vehicle Reservoir Volume Requirement Retrofitting the AD-4AIR DryerConnecting the AIR Lines All electrical connections must be waterproofed Testing the AD-4AIR DryerPresented AD-4AIR Dryer Troubleshooting ChartAD-4AIR Dryer Troubleshooting Chart Cycle. If pressure drops, check for kinks or With gauge installed at RES port of governorPressure should not drop below Cut-In pressure At the onset of the compressor UnloadedUnloaded for a minimum of 30 seconds. This Possible, check the air filter usage indicator Points where ice may form and block the flow. IfHow to help prevent discharge line freeze-ups, see Engine air filter and service if necessary ifAD-4AIR Dryer Troubleshooting Chart Preventative Maintenance Section AD-4AIR Dryer Troubleshooting Chart High Air Use Low Air UseHolset Type E & QE Compressor W/O Econ Valve Additional Troubleshooting InformationConventional Supply System & Integral Purge AIR Dryer Holset Type E & QE Compressor with Econ Valve

BW1450 specifications

The BENDIX BW1450 is a highly regarded air brake system that delivers exceptional performance and reliability in the heavy-duty truck and automotive sectors. The BW1450 is designed with advanced technologies and engineering breakthroughs that ensure enhanced safety and efficiency in braking operations.

One of the standout features of the BENDIX BW1450 is its robust and compact design. Constructed to withstand the rigors of heavy use, the system is both lightweight and durable, allowing for easy installation and maintenance. It incorporates a corrosion-resistant finish that helps protect against environmental factors, ensuring longevity and dependability.

The BW1450 leverages advanced modulation technology, which provides superior control during braking. This technology allows for gradual engagement and disengagement of the brakes, significantly reducing the risk of skidding or jackknifing during emergency stops. The system's sophistication extends to its ability to maintain consistent brake performance under various load conditions, making it a versatile choice for different vehicle types.

Another significant characteristic of the BENDIX BW1450 is its integrated Air Disc Brake technology. This feature not only improves the overall stopping power but also results in shorter stopping distances. In addition to enhanced performance, the air disc brakes are easier to maintain compared to traditional drum brakes, reducing downtime and service costs.

The BENDIX BW1450 also incorporates smart sensor technologies that monitor brake performance, providing real-time data to drivers and fleet operators. This capability enhances fleet management as it allows for timely maintenance interventions and ensures that the braking system operates optimally at all times.

Safety is a paramount concern in any braking system, and the BENDIX BW1450 is equipped with an anti-lock braking system (ABS). This feature prevents wheel lock-up during hard braking, thus providing additional control in slippery conditions and enhancing the vehicle's stability. Moreover, the system meets or exceeds various industry safety standards, reinforcing its position as a reliable choice for heavy-duty applications.

In conclusion, the BENDIX BW1450 air brake system represents a combination of innovative design, cutting-edge technology, and reliable performance. Its lightweight construction, advanced modulation control, air disc braking capabilities, and integrated safety features make it an exemplary choice for the demanding requirements of heavy-duty vehicles.
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