This standard covers rubber-seated butterfly valves, 3 in. (75 mm) through 72 in. (1,800 mm) in diameter, with various body and end types, for fresh and reclaimed water having a pH range from 6 to 12 and a temperature range from 33 to 125F (0.6 to 52C).<\/p>\n
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| 7<\/td>\n | Foreword I.\tIntroduction. I.A.\tBackground.\u2003Butterfly valves are generally used for pipelines carrying liquids and gases. Manufacturers of butterfly valves developed tight-closing, rubber-seated types for cooling water systems and power stations. Since 1940, most new valves install I.B.\tHistory.\u2003The need for standardization of butterfly valves was recognized by the American Water Works Association (AWWA) in June 1953. <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | I.C. Acceptance. In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification program for direct <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | II.\tSpecial Issues. II.A.\tGeneral.\u2003Conditions under which a valve is to be operated must be evaluated carefully by the purchaser. The evaluations must include the determination of the hydraulic characteristics of the system in which the valve will be installed and the operat II.B.\tBuried Valves Larger Than 48 In.\u2003Valves in this standard are provided with flanged ends. In buried applications, the purchaser is advised to consider providing means to accommodate issues such as differential settlement, capability to remove the val <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | II.C.\tAdvisory Information on Product Application.\u2003This standard does not describe all possible applications or manufacturing technologies. The purchaser should identify special requirements and required deviations from this standard and include appropria <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | II.D.\tPermeation.\u2003The selection of materials is critical for raw water, potable water, wastewater, and reclaimed water service and distribution piping in locations where there is likelihood the pipe will be exposed to significant concentrations of polluta <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | II.E.\tEffects of Manual or Power Actuation Stroke Time.\u2003When specifying manual, cylinder, and electric actuators in items 13, 14, 15, 16, and 17 of Sec. III.A, consideration should be given to the effects of valve operating speed on the pipeline hydraulic II.F\tValve Discs and Piping Design.\u2003The discs of butterfly valves, when in the fully open position, protrude into the adjacent upstream and downstream piping or other adjacent devices. This can especially be an issue with wafer-style butterfly valves, whe <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | II.G\tBolting Gray Cast Iron Flanges to Steel Flanges.\u2003The following recommendations are made for the use of high strength bolting used with either ASME or AWWA steel flanges when bolting to low ductility gray cast iron valve flanges. The ASME B16.1 standa <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | II.H.\tChlorine and Chloramine Degradation of Elastomers.\u2003The selection of materials is critical for water service and distribution piping in locations where there is a possibility that elastomers will be in contact with chlorine or chloramines. Documented II.I.\tFinite Element Analysis. Advisory Information on Valve Design.\u2003Calculation tools like FEA software can be used as a supplement to the equations, wall thickness tables, and size tables when listed in this standard for stress design. These calculation <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | III.\tUse of This Standard.\u2003It is the responsibility of the user of an AWWA standard to determine that the products described in that standard are suitable for use in the particular application being considered. III.A.\tPurchaser Options and Alternatives.\u2003The following information should be provided by the purchaser in the purchase documents: <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | III.B.\tModification to Standard.\u2003Any modification to the provisions, definitions, or terminology in this standard must be provided by the purchaser. IV.\tMajor Revisions.\u2003The major revisions made to the standard in this edition include the following: V.\tComments.\u2003If you have any comments or questions about this standard, please contact AWWA Engineering and Technical Services at 303.794.7711; write to the department at 6666 West Quincy Avenue, Denver, CO 80235-3098; or email at standards@awwa.org. <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | AWWA Standard SECTION 1:\tGENERAL Sec. 1.1\tScope <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Sec. 1.2\tPurpose Sec. 1.3\tApplication SECTION 2:\tREFERENCES <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | SECTION 3:\tDEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | SECTION 4:\tREQUIREMENTS Sec. 4.1\tMaterials <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Sec. 4.2\tGeneral Design <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Sec. 4.3\tWorkmanship Sec. 4.4\tCoatings <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | SECTION 5:\tVERIFICATION Sec. 5.1\tTesting by the Manufacturer <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Sec. 5.2\tNotice of Nonconformance SECTION 6:\tDELIVERY Sec. 6.1\tMarking Requirements Sec. 6.2\tShipping Requirements <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Sec. 6.3\tAffidavit of Compliance <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Installation, Operation, and Maintenance of \nRubber-Seated Butterfly Valves SECTION A.1:\u2003GENERAL SECTION A.2:\u2003UNLOADING SECTION A.3:\u2003STORAGE <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | SECTION A.4:\u2003\ufffdINSPECTION PRIOR TO INSTALLATION SECTION A.5:\u2003INSTALLATION <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | SECTION A.6:\u2003FIELD TESTING SECTION A.7:\u2003OPERATION <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | SECTION A.8:\u2003MAINTENANCE <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" AWWA C504-23 Rubber-Seated Butterfly Valves<\/b><\/p>\n |