Which component is responsible for controlling gas flow to the burner in a gas furnace?

The component responsible for controlling gas flow to the burner in a gas furnace is the gas valve. The gas valve plays a crucial role in regulating the amount of gas supplied to the burner assembly, ensuring that the furnace operates efficiently and safely. When the thermostat calls for heat, the gas valve opens, allowing gas to flow into the burner orifice, where it mixes with air before being ignited.

While the burner orifice is essential for delivering the correct amount of gas-air mixture to the furnace, it does not have the capability to control gas flow. Instead, its function is to create an appropriate mixture for combustion. The flue baffle is designed to improve efficiency by redirecting the flue gases and does not influence gas flow. The draft diverter aids in venting exhaust gases safely but likewise does not control the gas flow to the burner. Thus, the gas valve is the key component for gas flow regulation in a gas furnace.