The purpose of this standard is to provide purchasers, manufacturers, and suppliers with the minimum requirements for metal-seated gate valves for water supply service, including materials, design, testing, inspection, rejection, marking, and shipping.<\/p>\n
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| 7<\/td>\n | Foreword I.\tIntroduction. I.A.\tBackground.\u2003The first AWWA standard for gate valves was adopted June 24, 1913. It was reissued without change on June 9, 1916, as part of AWWA Standard Specifications for Hydrants and Valves. At the time of the next revision in 1938, the standard for I.B.\tHistory.\u2003The dates of approval and numerical designation of past editions of ANSI\/AWWA C500 are listed below. Dates shown in parentheses are the effective dates for use of the revised editions. <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | I.C.\tAcceptance.\u2003In 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 | ||||||
| 9<\/td>\n | II.\tSpecial Issues. II.A.\tField Testing and Operating Gate Valves at High Pressure. <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | II.B\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 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: <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | III.B.\tModification to Standard. Any modification of the provisions, definitions, or terminology in this standard must be provided by the purchaser. IV.\tMajor Revisions.\u2003Major changes made to the standard in this revision include the following: <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | V.\tComments.\u2003If you have any comments or questions about this standard, please call AWWA Engineering and Technical Services at 303.794.7711, FAX at 303.795.7603, write to the department at 6666 West Quincy Avenue, Denver, CO 80235-3098, or e-mail at stand <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | AWWA Standard SECTION 1:\u2002GENERAL Sec.\u20021.1\tScope <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Sec.\u20021.2\tPurpose Sec.\u20021.3\tApplication SECTION 2:\u2002REFERENCES <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | SECTION 3:\u2002DEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | SECTION 4:\u2002REQUIREMENTS Sec.\u20024.1\tData to Be Supplied Sec.\u20024.2\tMaterials <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Sec.\u20024.3\tGeneral Design <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Table 1\tValve stem design torque Table 2\tMinimum waterway sizes <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Table 3\tMinimum thickness of valve body and bonnet <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Table 8\tMinimum diameter of stem and minimum number of turns to open <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Table 9\tStainless-steel valve stem alloys <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | SECTION 6:\u2002DELIVERY Sec.\u20026.1\tMarking Sec.\u20026.2\tPreparation for Shipment Sec.\u20026.3\tAffidavit of Compliance <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Installation, Operation, and Maintenance of Gate Valves <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" AWWA C500-19 Metal-Seated Gate Valves for Water Supply Service<\/b><\/p>\n |