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There are two types of zone valve references that address labeling in NFPA 99 (2012 edition). One is for new construction projects which is located here: 5.1.4.8.8 Zone valves shall be labeled in accordance with 5.1.11.2. 5.1.11.2 Shutoff Valves. 5.1.11.2.1 Shutoff valves shall be identified with the following: (1) Name or chemical symbol for the specific […]