What is a key function of the gas valve in a furnace?

The gas valve in a furnace plays a crucial role by controlling the flow of gas to the burner. This component is essential for the combustion process, as it determines how much gas enters the burner, which in turn affects the furnace's heating output. Proper regulation of gas flow ensures that the burner can ignite effectively and operate efficiently, providing safe and reliable heating. If the gas valve fails to function correctly, it could lead to inadequate heating, increased emissions, or even dangerous situations like gas leaks. Understanding the role of the gas valve in regulating gas flow is foundational for anyone working with gas furnaces, as it directly impacts both efficiency and safety.