The compressor builds air pressure and the governor controls the system air pressure limits. When 120 PSI is reached, the governor bypasses the compressor so that it stops pumping air. When the air compressor reaches it’s limit the governor is there to unload it preventing air pressure from building too high.
The governor controls when the air compressor will pump air into the air storage tanks. When air tank pressure rises to the “Cut-out” level, the governor stops the compressor from pumping air. The compressor builds air pressure and the governor controls the system air pressure limits.
The compressor builds air pressure and the governor controls the system air pressure limits. As long as the compressor pressure at port A is greater than the reservoir pressure at port D, the check valve is held open and stripped air flows into the reservoir. Because we still have compressed air inside the canister, the canister now becomes the pressure source and the blue air inside the canister flows upwards and then down the sides of the canister to get to the orange chamber which is vented to the outside air pressure by valve A. As this pressure rushes down the sides of the canister, it collects and purges all moisture and contaminates which were trapped in the screens and desiccant, and forces it down through the orange cavity and outside the dryer through valve A. When all of the pressure within the canister has vented, then the purge cycle is completed.
The purpose of the compressor GOVERNOR is to maintain the air pressure in the reservoir between the maximum pressure desired and the minimum pressure required automatically for safe operation by controlling the compressor unloading mechanism. When reservoir pressure is reduced to the cut-in setting of the compressor governor, the governor tube again exerts sufficient spring pressure on the valve mechanism to depress and close the lower valve and open the upper valve, thereby shutting off and exhausting the air from the compressor unloading mechanism and compression is resumed. Air pressure from the governor opens the unloader valves to unload or stop compression in the compressor.
how does an air compressor governor work Related Question:
At what pressure should the governor cause the compressor to return to its loading stage?
The governor must take the compressor out of its pumping stage (unload/cut-out) when system air pressure reaches 120 to 145 psi (828 to 1,000 kPa), and also put it back into the pumping stage at a minimum of 100 psi (690 kPa).
What is a governor cut out?
When air tank pressure rises to the “cut-out” level (around 125 pounds per-square-inch or “psi”), the governor stops the compressor from pumping air. When the tank pressure falls to the “cut-in” pressure (around 100 psi), the governor allows the compressor to start pumping again.
How can you manually check the slack adjusters?
With service brakes in the released position, mark the push rod even with the brake chamber. Make a full brake application and mark the push rod again. Measure between the two marks to determine the length of push-rod travel (stroke).
How long should it take to build air pressure?
Air pressure build-up from 85 psi to 100 psi should take 45 seconds or less. While driving, observe the air pressure gauge during build-up to ensure proper air system operation.
What is the purpose of the air governor?
The governor (Fig. 20), which is usually compressor mounted, operates in conjunction with the compressor and maintains reservoir air pressure between a predetermined maximum and minimum pressure. The governor will normally cut in 20-25 psi below the cut-out pressure.
Why does my air dryer keep purging?
When the air pressure becomes greater than that of the preset “cut-out”, the governor controls the unloader mechanism of the compressor to stop the compressor from building air and also causes the air dryer to purge.
At what psi do air brakes lock up?
If the pressure in the air system pulls below 60 psi, the parking brake knob will pop out and set the parking brakes. This is a safety feature so the truck will stop, because if the pressure falls too low, the service brakes will not work. The other system component stops the vehicle when you push on the brake pedal.
How does a governor valve work?
A steam turbine governor is a component of the turbine control system that regulates rotational speed in response to changing load conditions. The governor output signal manipulates the position of a steam inlet valve or nozzles which in turn regulates the steam flow to the turbine.
What does the governor do on air brakes?
Explanation In an air brake system, the air compressor governor controls when the air compressor pumps air into the storage tanks. It stops pumping if the pressure in the tanks becomes too high, and begins pumping if the pressure becomes too low.
How is a clogged air filter likely to affect the air compressor?
An unclean air or oil filter causes the compressor to run less efficiently. That costs more money to run and the compressor will need to be replaced sooner.
What would be the result if the Governor failed to unload the compressor?
Drums worn thin will build up heat too quickly. If the governor valve failed to “unload” the compressor, what would protect the reservoirs from becoming over pressurized and bursting? The SAFETY VALVE protects reservoirs from becoming over pressurized and bursting. What is the purpose of having more than one reservoir?
How much compressed air must the storage tanks hold?
A good rule of thumb for most applications is to have three to five gallons of air storage capacity per air compressor cfm output. So if your air compressor is rated for 100 cfm, you would want 300 to 500 gallons of compressed air storage.
Where is the unloader valve on an air compressor?
Where Is the Unloader Valve Located? If you own a smaller reciprocating air compressor, you’ll likely find the unloader valve mounted on or inside the pressure switch. When the switch shuts the compressor off, it actuates the valve.
What is unloader valve?
An air compressor unloader valve is a device used by air compressors to release the trapped air inside the compression chamber and tank discharge line when the motor stops. This allows the motor to start up easier. In general there are two types of air compressor unloader valves, electrical and mechanical.
What is the normal operating range for an air brake system?
Normal air brake system pressure range is around 690 to 828 kPa (100 to 120 psi). Drivers should know the normal pressure range of the vehicle they operate and should report any abnormal condition.
