In what application is a gas valve primarily operated during interrupted duty ignition?

The application where a gas valve is primarily operated during interrupted duty ignition is in gas furnaces. In these systems, the gas valve is designed to open and allow gas to flow to the burner only after the ignition source, such as a spark or hot surface igniter, has created an initial flame. Once the flame is established, the gas valve remains open for as long as the heating is required. If the flame goes out or the system needs to pause, the gas valve closes, halting gas flow. This operation is essential for safety and energy efficiency, as it prevents gas from flowing without a flame to ignite it, which could lead to dangerous conditions.

In contrast, electric stoves utilize electric heating elements rather than gas, and do not require a gas valve. Boilers may operate using gas valves, but their ignition and operation could be continuous rather than interrupted. Heat pumps typically operate on electric power and do not involve a gas valve in their standard applications, focusing instead on moving heat rather than burning fuel. Therefore, gas furnaces are the most relevant application for interrupted duty ignition involving gas valves.