BENDIX BW2077 manual Governor EverFlow Module

	Governor					EverFlow™ Module
		CON			GOV	RES
	CON					3/8"
Schrader
Valve			RES	SEC	CON	CON
	1/4"						Primary
From		Supply	CON	PRI		1/2"
							Reservoir
Engine		IN				1/2"
IN	CON
		OUT					Secondary
					EFMIS®	Check
							Reservoir
					-	Valve
					AD	Supply
				Accessories
Compressor						IN
					Dryer OUT	CON	Manual Valve
						Pressure
		CON				Protection Valve
						(Optional)

EverFlow™	Bulk Offload CTI
IN
	CTI System

Bulk Tanker

Compressor

OUT Discharge Line

Unloader Valve

Note:

The AD-IS®air dryer purge piston has a purge control channel drain. This allows any condensation in this area to flow past a diaphragm in the top of the purge piston and out through a channel in the middle of the central bolt of the purge assembly to be drained. During the purge cycle this drain is closed.

FIGURE 2 - AD-IS®AIR DRYER SYSTEM SCHEMATIC

Air then flows into the desiccant drying bed and becomes progressively drier as water vapor adheres to the desiccant material in a process known as “ADSORPTION.” Dry air exits the desiccant cartridge through the delivery check valve and also through an orifice into the purge reservoir. The delivery check valve opens, supplying air to pressurize the air brake system. The purge reservoir stores air that will be used to reactivate the desiccant during the purge cycle.

The air dryer will remain in the charge cycle until the air brake system pressure builds to approximately 85 p.s.i. At 85 p.s.i. the EverFlow™ electronic module is actuated and begins the purge cycle. When the air pressure reaches approximately 106 psi, the pressure protection valves will open and air will be supplied to the primary reservoir, secondary reservoir or other accessories. If the pressure protection valves are preset to different values the valves will open in order of lowest setting to highest setting when charging a flat system. The air dryer will remain in the

charge cycle until the air brake system pressure builds to the governor cut-out setting of approximately 130 p.s.i. When air brake system pressure reaches the cut-out setting of the governor, the governor unloads the compressor and the electronic module sends a signal to one of the air dryers to purge. The governor unloads the compressor by allowing air pressure to fill the line leading to the compressor unloader mechanism - causing the delivery of compressed air to the AD-IS®EverFlow™ assembly to be suspended. Similarly, the governor also supplies air pressure to the EverFlow™ electronic module. The electronic module uses this signal to determine the volume of air into the brake system. If the volume is normal, the electronic module sends a signal to the control port on the proper dryer. If the volume is high, the electronic module switches the dryers every 30 seconds until the air volume returns to normal. The air dryer purge piston moves down in response to a pneumatic signal from the EverFlow™ electronic module, causing the purge valve to open to the atmosphere and

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