What happens to the fuel valve when the combustion air pressure drops too low?

When the combustion air pressure drops too low, the fuel valve serves a critical safety function by de-energizing. This is typically part of a safety interlock system designed to prevent unsafe operating conditions.

When the combustion air pressure is insufficient, it indicates that the environment for combustion is not ideal—meaning there may be insufficient oxygen for the fuel to burn properly. De-energizing the fuel valve in this scenario helps to prevent the possibility of incomplete combustion, backflow of gases, or even potential explosions that could occur if fuel continues to be released without adequate air supply.

This safety measure ensures that the system operates under optimal conditions, safeguarding both the equipment and personnel from harm. It highlights an essential principle in power engineering: maintaining safe operations through automated controls that respond to changing conditions in the combustion process.