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AWWA C518-24 Double-Disc, Swing-Check Valves for Waterworks Service, 2 In. Through 48 In. (50 mm Through 1,200 mm) NPS, 2024
- Foreword [Go to Page]
- I. Introduction. [Go to Page]
- I.A. Background. Double-disc swing-check valves have been commonly used on pump discharge applications in the waterworks industry for more than half a century. These check valves are designed to prevent backflow by automatically closing rapidly on flow-re [Go to Page]
- I.B. History. The need for standardization of double-disc swing-check valves was recognized by AWWA in 1992. The AWWA Gate and Check Valve Committee worked to publish the first edition of ANSI/AWWA C518 beginning in 2003, with eventual approval by the AWW [Go to Page]
- 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
- II. Special Issues. [Go to Page]
- II.A. General. Conditions 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 [Go to Page]
- II.B. Advisory Information on Product Application. This 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
- II.C. Chlorine and Chloramine Degradation of Elastomers. The 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 [Go to Page]
- II.D. Permeation. The selection of materials is critical for potable water, reclaimed water service, and distribution piping in locations where there is likelihood the pipe will be exposed to significant concentrations of pollutants consisting of low-mole
- III. Use of This Standard. It 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. [Go to Page]
- III.A. Purchaser Options and Alternatives. The following information should be provided by the purchaser: [Go to Page]
- III.B. Modification to Standard. Any modification to the provisions, definitions, or terminology in this standard must be provided by the purchaser.
- IV. Major Revisions. Major changes made to the standard in this revision include the following:
- V. Comments. If you have any comments or questions about this standard, please call AWWA Engineering and Technical Services at 303.794.7711; write to the department at 6666 West Quincy Avenue, Denver, CO 80235-3098; or e-mail at standards@awwa.org.
- AWWA Standard
- SECTION 1: GENERAL
- Sec. 1.1 Scope
- Sec. 1.2 Purpose
- Sec. 1.3 Application
- SECTION 2: REFERENCES
- SECTION 3: DEFINITIONS
- SECTION 4: REQUIREMENTS
- Sec. 4.1 Data to Be Provided by the Manufacturer
- Sec. 4.2 Materials
- Sec. 4.3 General Design
- SECTION 5: VERIFICATION
- Sec. 5.1 Inspection
- Sec. 5.2 Testing
- Sec. 5.3 Nonconformance
- SECTION 6: DELIVERY
- Sec. 6.1 Marking
- Sec. 6.2 Shipping
- Sec. 6.3 Affidavit of Compliance [Go to Page]
- Installation, Operation, and Maintenance of Double-Disc Swing-Check Valves [Go to Page]
