Fuel gas shutoff valves represent the main line of defense in combustion devices such as burners and boilers. They’re key to the safe operation of equipment for nonresidential comfort heating, commercial and industrial heating, and power and steam generation applications worldwide. While conventional modular gas valve designs are popular and effective, the latest gener- ation of valves has even more dramatic improvements. Recent technological advance- ments — in models such as new modular gas valves from ASCO — offer breakthrough features and benefits. These include higher flows, more compact footprints, and greater modularity and flexibility to enable downsizing of fuel train components, as well as broad- er temperature ranges, higher close-off pressures, more immediate availability, and reduced costs of ownership.