What do redundant gas valves used in gas furnaces feature?

Redundant gas valves in gas furnaces are designed with dual gas shut-off seats to enhance safety and reliability. The primary purpose of having these two separate shut-off mechanisms is to ensure that if one valve fails or fails to seal properly, the second valve can still effectively stop the flow of gas. This redundancy helps prevent gas leaks, which can lead to dangerous situations such as fire or explosion.

Using dual gas shut-off seats means that the system has a higher level of integrity, as it reduces the likelihood of gas escaping into areas where it could pose risks. This feature is especially critical in environments where safety is paramount, ensuring that there are backup systems in place for controlling the gas supply.

In contrast, choices like single shut-off seats or automated controls do not provide the same level of safety that redundancy offers. Single shut-off designs do not have a backup, and therefore, if a failure occurs, there's no secondary line of defense. Automated controls, while beneficial for efficiency, do not inherently relate to the safety aspect provided by having dual shut-off seats. Pressure gauges, although useful for monitoring gas flow and pressure, do not contribute to the function of shutting off gas in the event of an emergency.