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  1. ampav

    NFPA 20 Listed Valves

    Thank you all, your replies have been totally helpful!
  2. ampav

    NFPA 20 Listed Valves

    What does NFPA 20 mean by "listed valves" for fire protection services? Do the valves to be installed must be "UL listed" or may they be API valves? For instance, what advantages does an UL listed ductil iron gate valve has against a stainless steel gate valve API certified, when the intended...

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