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AWWA C509-94
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AWWA C509-94 Resilient-Seated Gate Valves for Water-Supply Service (includes addendum C509a-95)
standard by American Water Works Association, 01/01/1994
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This standard covers iron-body, resilient-seated gate valves, including tapping gate valves, with nonrising stems (NRS) and outside-screw-and-yoke (OS The "Modification to Standard" and "Acceptance" sections have been added to the foreword; Asbestos packing and gasket materials are no longer referenced in the standard; Information on tapping valves has been added; Soft metric equivalents have been added; Definitions have been modified; The Safe Drinking Water Act 1986 Amendments reference to maximum lead content in bronze has been added; Repairs to castings of valve components have been clarified (Sec. 5.1.2.); Discussion of 16-in. (400-mm) and 20-in. (500-mm) valves has been added to the scope of this standard (Sec. 1.1.1).This addendum to ANSI/AWWA C509-94 Standard for Resilient-Seated Gate Valves for Water Supply Service replaces Page 9, Sec. 4.8.3.