AS 6401 pdf download – Knife-gate valves for waterworks purposes 1.1 sCOPE This Standard specifies requirements for Class 10 flanged，wafer and lugged，rising andnon-rising spindle，uni-directional and bi-directional，gland box and bonneted knifc-gatevalves of sizes DN 50 to DN 15o0 inclusive for: (a)cold potable water supply (up to 40°C); and (b)drainage and sewerage systems (continuous flow up to 45°C and intermittent flow up...