... salt and so on.Design and test standardsAWWA C504Connecting flange accord withANSI B16.1,ANSI/AWWA C111/A21.11 ... replacement;3.30 "72 "eccentric structure, equipped with overflow valve disc way, can obtain higher intensity, light weight, the ... valve, within the scope of reliable performance;8. Design pressure, completely sealed, leakage is zero AWWA C504 Flange Concentric Rubber Lined Butterfly Valve ...