Page 9
OUTDOOR B
BBQ G
GRILLS
Theory of Operation
2-4
Burner Components:
Gas Orifice
- An opening or hole which regulates or limits the amount of gas flowing to a burner. Gas flow rate (vol-
ume) depends on the size of the orifice (hole) and the gas pressure at the inlet of the orifice.
Air Shutter
- This is used to adjust the size of the primary air inlet area and therefore controls primary air flow.
Venturi Tube -
A section of pipe at the inlet of the burner body that narrows and then flares out again. This tube
helps maintain a proper and constant primary air injection.
Mixing Tube/Throat
- Serves to carry the gas/air mixture from the venturi tube to the burner body.
Burner Body
- The accumulation chamber below the burner base which allows the gas and air to mix together fully.
Burner Head
- The component containing the burner ports where the gas/air mixture ignites. The burner ports are
distributed in a useful pattern to optimize heat transfer. The flames should be spread so they can be easily reached
by secondary air and provide a stable blue flame.
Air Shutter
Air Shutter
Burner Head
Mixing Tube/Throat
Burner Body
Venturi Tube
Venturi Tube
The Gas Orifice or
hole
regulates or limits the amount
of gas flowing to a burner.
The part which contains the orifice
should be referred to as an
orifice
Spud, Hood
or
Cap.
Fig. 2-1
Fig. 2-2
Fig. 2-3