How do you know if a valve is OK for natural gas?

Charlie from wmass

AGA is what we use here in Mass for gas valves, no AGA, no use.

realolman

Used to be

that they were marked WOG, which stood for Water Oil or Gas. ( there are, of course, other gases besides natural)

The other day I was looking through the catalogs of two major distributors for some small valves or stopcocks. I know I have seen some of what I found many times on the job, but I found it interesting that in the descriptions of these items they mentioned many mediums, but not natural gas. Many times it would say inert gas.

The lack of the mention of natural gas spoke kind of loudly to me at the time.

Finally, after four catalogs, and not in the one that sold plumbing and heating supplies, I found some that were AGA certified, specifally stated natural gas, and ordered those. They seemed almost as they were intended for the shut off of a main supply or something. I never really found anything like a stopcock that specifically mentioned being good for natural gas.

Are the WOG's good for natural gas. And isn't there some newer designation than WOG?