here is the email from the asco rep...
Good morning Tyson;
The main reason to use ASCO combustion valves for you gas applications is that gas valves list the media on the valve nameplate as â€œFuel Gasâ€ where as the general purpose valves list the media as Air, (inert gas), Water and Light Oil. Inert Gas is NOT a fuel Gas.
Some other features of the ASCO Combustion valves are features such as junction box, pipe taps, visual indication, proof of closure, leading agency approvals
Please feel free to call us at 973-966-2082 if you would like to discuss this further.
Technical Support Representative
Emerson Industrial Automation
ASCO Valve, Inc.