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This standard establishes minimum requirements for rubber-seated butterfly valve assemblies that are 78 in. (2,000 mm) and larger in diameter with flanged ends suitable for fresh and reclaimed water having a pH range from 6 to 12 and a temperature range from 33 to 125°F (0.6 to 52°C), and suitable for a maximum steady-state fluid working pressure of 250 psig (1,724 kPa [gauge]), a maximum steady-state differential pressure of 250 psi (1,724 kPa), and a maximum full-open fluid velocity of 16 ft/s (4.9 m/s) based on nominal valve size in classes as defined in Sec. 1.1.1 and Sec. 1.1.2.