Which electrically operated valve will shut down the burner if there is an ignition or combustion failure?

The main fuel valve is designed to control the flow of fuel to the burner and plays a crucial role in safety mechanisms. In the event of an ignition or combustion failure, this valve automatically shuts down the fuel supply to prevent any risk of unburned fuel accumulating, which could lead to dangerous situations like explosions or fires. This safety feature is essential for ensuring that the system operates within safe parameters and responds appropriately to malfunctions.

While other valves play important roles in the overall operation of the burner, they do not specifically serve the function of shutting down the fuel supply in response to ignition failures. The safety valve, for example, is primarily focused on maintaining safe pressure levels and protecting the system from overpressure conditions. Pressure relief valves work to release excess pressure, and isolation valves are used for service and maintenance purposes rather than directly for ignition safety. Therefore, the main fuel valve is the critical component that ensures fuel flow is cut off in case of an ignition failure, enhancing the safety of the burning operation.