What happens to the gas valve when power fails?

In the event of a power failure, the gas valve is designed to close immediately as a safety measure. This automatic response is crucial in preventing gas leaks that could occur if equipment remains operational without sufficient power, risking an explosion or fire. The immediate closure of the gas valve is an essential safety feature, ensuring that even in emergency situations, the flow of gas is halted swiftly to protect users and property.

The other responses do not align with the standard safety protocols for gas valves. For instance, allowing the valve to remain open would pose significant risks, while opening wider could exacerbate any dangerous situations. Similarly, slowly releasing gas pressure could lead to hazardous conditions rather than enhancing safety. Thus, the immediate closure of the gas valve during a power failure is the best preventive measure.