The purpose of this standard is to provide minimum requirements for resilient-seated cast-iron eccentric plug valves, suitable for water, wastewater, and reclaimed water service, including materials, application, inspection, handling, and shipping.<\/p>\n
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| 7<\/td>\n | Foreword I.\tIntroduction. I.A.\tBackground.\u2003Resilient-seated cast-iron eccentric plug valves were introduced in the 1930s as tight-sealing and wear-resistant valves for handling \ufb02uids with solids content. The use of such valves has since grown for potable and wastewater application I.B.\tHistory.\u2003Resilient-seated cast-iron eccentric plug valves were \ufb01rst standardized by the Manufacturers Standardization Society (MSS) in 1991, in standard practice SP-108. The need for standardization of resilient-seated cast-iron eccentric plug valves 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.\tGeneral.\u2003Conditions under which a valve is to be operated must be evaluated carefully by the purchaser. Torque requirements for valve operation vary considerably with di\ufb00erential pressure across the valve, \ufb02uid velocity, \ufb02uid temperature, and upstre II.B.\tAdvisory Information on Product Application.\u2003This standard does not cover all possible applications or manufacturing technologies. The purchaser should identify special requirements and required deviations from this standard and include appropriate <\/td>\n<\/tr>\n | ||||||
| 10<\/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. <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | IV.\tMajor Revisions.\u2003Major changes made to the standard in this revision include the following: 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 email at standa <\/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 | ||||||
| 17<\/td>\n | SECTION 3:\u2002DEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | SECTION 4:\u2002REQUIREMENTS Sec.\u20024.1\tPermeation <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Sec.\u20024.2\tData to Be Provided by the Manufacturer or Supplier Sec.\u20024.3\tMaterials <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Sec.\u20024.4\tDesign <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Table 2\tPrototype actuator test cycles required <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | SECTION 5:\u2002VERIFICATION Sec.\u20025.1\tInspection Sec.\u20025.2\tTesting <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Table 3\tMinimum duration of shell and seat tests Table 4\tValve test cycles required <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Sec.\u20025.3\tBasis for Rejection SECTION 6:\u2002DELIVERY Sec.\u20026.1\tMarking <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Sec.\u20026.3\tAffidavit of Compliance <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | APPENDIX A Installation, Operation, and Maintenance of Resilient-Seated Cast-Iron Eccentric Plug Valves <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" AWWA C517-16(R21) Resilient-Seated Cast-Iron Eccentric Plug Valves<\/b><\/p>\n |