Air Governors
An explosion is unlikely due to safety valves that prevent excessive pressure. But on mobile equipment in particular, the air compressor shaft is often driven directly by the engine, continuously compressing air whenever the engine is running. This is inefficient and hard on the air compressor.
This is where the air governor comes in.
In this lesson we will be taking a closer look at an air governor. We will examine the internal structure and the operation of the governor.
The Structure
Despite how it looks from the outside, the governor is a surprisingly complex device.
The side of the governor has three external ports.
There is:
- An inlet port attached to the reservoir.
- An unloader port which is attached to both the compressor and the air dryer.
- An exhaust port which is left open to the atmosphere.
The top half of the governor contains the adjusting screw, pressure setting spring, and the lower spring seat/spring guide combo.
Screw
Setting
Spring
Spring
Seat
Port
Guide
Port
Port
Port
Stem Spring
Stem
Valve
Valve Spring
The bottom of the governor has the piston.
Within the piston there is the exhaust stem with its spring and the inlet/exhaust valve and its spring.
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