AWWA C510-07 Double Check Valve Backflow Prevention Assembly

This standard describes the double check valve backflow prevention assembly. The assembly shall be for operation on hot or cold water lines and capable of withstanding a working water pressure of at least 150 psi (1,034 kPa) without damage to working parts or impairment of function. This standard describes hot- and cold-water double check valve backflow prevention assemblies. Assemblies shall be designed to operate at a minimum temperature range of 33ºF to 140ºF (1ºC to 60ºC). Hot water assemblies shall be designed to operate, at a minimum, in water at a temperature range of 33ºF to 180ºF (1ºC to 82ºC). A complete assembly consists of two internally loaded, independently operating check valves, located between two tightly closing resilient-seated shutoff valves, with four properly placed resilient-seated test cocks (see Sec. 4.3.1.3). Major revisions made to the standard in this revision include the following: AWWA standard materials statement has been added (Sec. III.A.2 and Sec. 4.1); synthetic coating of ferrous bodies has been removed (Sec. 4.1.2); the material callouts have been updated (Sec. 4.1.3); the identification of nominal size of the assembly has been revised (4.2.1.1); the requirements for structural capability and operational capability have been revised (Sec. 4.2.2.1 and Sec. 4.2.2.2); the sections on area of waterways, clearance of moving parts, facing rings for poppet-type valves, facing rings for swing-type valves, and bushings have been removed (former Sec. 4.3.1.2 through Sec. 4.3.1.6); the requirements for shutoff valves have been updated (Sec. 4.3.1.6); requirements for operational cycle testing have been added (Sec. 4.3.2.3); and, requirements for replacement parts have been added (Sec. 4.3.4).