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These natural gas burners control the gas as it enters the gas burner tubes. The gas burner tubes have little holes which control the amount of gas that exits the top of the gas burner tubes. The black pipe running out of the gas valve is the manifold. Where the gas burner tubes are connected to the manifold are little precisely drilled holds inside of brass inserts. The precisely drill holes are engineered specifically for natural gas. The size of the holes plus the pressure in the manifold determine how much natural gas enters the gas burner tubes.
The size of the holes in the brass inserts will be different from LP gas to natural gas. The size will also be different depending on the rated BTU output of equipment whether it be a hot water heater, boiler, or furnace. On start up of the equipment when it is installed a technician should adjust the pressure on the manifold so the the rated amount of gas enters the gas burner tubes. This ensures, as long as all other parts are functioning properly, that the combustion process works as engineered and the gas delivered to the combustion chamber is burned properly. That is important and a part of the efficiency of the gas burning system.
