What "UL Listed" and "FM Approved" requirement for valves.
UL = Underwriter Laboratories are safety certifiers.
FM = Factory Mutual, an insurance company.The Alloy Valve Stockist: duplex Automatic Control valves, super duplex valves, 6Moly valves, inconel valves, incoloy valves, alloy 20 valves and titanium valves.UL, FM, and CSA approved valves are tested by these agencies and certified as meeting a specific standard.  Typically for gas applications.  You have to look carefully at the standard that the valves are claimed to meet and ensure the standard is applicable to your situation.

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