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All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges with full port ball valves and a separate flow check valve. 7. Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves. 8. Install vacuum relief valve in accordance with local code requirements 9. All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown 10. Anti-scald rated mixing valve is reco