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AWWA C520-24 Knife Gate Valves, Sizes 2 In. (50 mm) Through 96 In. (2,400 mm), 2024
- Foreword [Go to Page]
- I. Introduction. [Go to Page]
- I.A. Background. Knife gate valves are generally used for isolation of pipes in water and wastewater treatment plants. Knife gate valves can be metal or resilient seated, bidirectional, or unidirectional. [Go to Page]
- I.B. History. The need for standardization of knife gate valves was recognized by the American Water Works Association (AWWA) in 2007, resulting in the formation of a standards committee. Subsequent revisions of C520 were approved by the AWWA Board of Dir [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. 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.C. 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.D. Advisory Information on Scheduling Requirements. Valves made in accordance with this standard in large sizes are not production-run products. They are custom designed and manufactured for the specific application. As a consequence of this, the valve [Go to Page]
- 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.
- III.A. Purchaser Options and Alternatives. The following information should be provided by the purchaser.
- III.B. Data to Be Provided by the Manufacturer or Supplier. Sec. 4.1 describes the minimum data to be provided by the supplier. Because these valves may be custom designed and manufactured, purchasers may require more detailed or comprehensive data. Such
- III.C. Modification to Standard. Any modification of the provisions, definitions, or terminology in this standard must be provided by the purchaser. [Go to Page]
- IV. Major Revisions. Major revisions made to the standard in this edition 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 Provided by Manufacturer or Supplier
- Sec. 4.2 Materials
- Sec. 4.3 General Design
- Sec. 4.4 Manual Actuators
- Sec. 4.5 Power Actuators
- Sec. 4.6 Workmanship and Coatings
- SECTION 5: VERIFICATION
- Sec. 5.1 Production Test Requirements
- Sec. 5.2 Proof-of-Design Test Requirements
- SECTION 6: DELIVERY
- Sec. 6.1 Requirements [Go to Page]
- APPENDIX A [Go to Page]
- Installation [Go to Page]
