Air Governor

The Brake System:

Air Governor

The operation of the unloader mechanism is controlled by the air governor. Many different designs of governors are used, but they all serve the same purpose and operate on the same basic principles. Primarily, any air governor is a valve held closed by spring tension. Air pressure from the compressor and air reservoir is applied to a diaphragm, piston, or a similar device that opposes the spring tension in an attempt to open the valve. When the air pressure reaches a desired maximum of about 110 to 120 PSI, air pressure overcomes the spring tension and the governor valve opens. Air pressure flows through the open valve to the unloader mechanism opening the unloader valves. When the air pressure drops to a desired minimum, spring tension on the governor valve overcomes the air pressure closing the valve. This releases the air pressure to the unloader allowing the unloader valves to close.

The air governor is mounted on the engine side of the cowl (firewall). At least two air lines must be connected to a governor: one pressure line from the air supply and one line to the unloader on the compressor. A third line for the pressure exhaust may be connected between the governor and the vehicle vent system. The governor contains a filter to strain the air that passes through it. Most governors have an external adjustment that allows the mechanic to change the tension on the spring holding the air valve closed, which will in turn change the amount of air pressure required to open the governor.

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Article Pages
1. The Brake System
2. Introduction
3. Principles Of Braking
4. Braking Requirements
5. Factors Controlling Retardation
6. External-Contracting And Internal-Expanding Brakes
7. Brake Types
8. Brake Drum Construction
9. Brake Shoes
10. Rotating And Non-Rotating Units
11. Self-Energizing Action
12. Disc Brake
13. Comparing Disc And Drum Brakes
14. Floating Caliper
15. Fixed Caliper
16. Hydraulic Brakes
17. Master Cylinder
18. Wheel Cylinder
19. Hydraulic Brake System Insepction
20. Before Road Test Inspection
21. Road Test Inspection
22. After Road Test Inspection
23. Air-Hydraulic Brake System
24. Air-Hydraulic Master Cylinder
25. Air-Hydraulic Cylinder
26. Air Compressor
27. Air Governor
28. Air-Hydraulic Brake System Components
29. Trailer Coupling Hoses And Connectors
30. Air-Over Hydraulic Cylinder
31. Operation Of Air-Hydraulic Brakes
32. Air-Hydraulic Brakes Of Large Trucks
33. Trailer Air-Over-Hydraulic Brake Systems
34. Air-Hydraulic Brake System Inspection
35. Before Road Test Inspection
36. Air-Hydraulic Brake System Road Inspection
37. Trouble Shooting Air-Hydraulic Brakes
38. Air-Brake System
39. Air-Brake Quick Release Valve
40. Air-Brake Relay Valve
41. Air-Brake Chamber
42. Air-Brake Slack Adjuster
43. Air-Brake Auxiliary Components
44. Semi-Trailer Air Brake Systems
45. Operation Of Straight Air-Brake System
46. Miscellaneous Air-Brake Components
47. Troubleshooting Straight Air Brake Systems

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