AWWA C520:2010
AWWA C520:2010 Knife Gate Valves, Sizes 2 In. (50 Mm) Through 96 In. (2,400 Mm) Specifies bonneted, bonnetless and one- and two-piece fabricated stainless-steel and cast ductile-iron body knife gate valves with resilient or metal seats, including tapping knife gate valves, for us