AWWA C703-15 pdf download.Cold-Water Meters— Fire-Service Type
4.1.9 Companion fanges. Companion fanges shall be made of cast iron, such as those listed in ASTM A48 or A126; or, when so specifed by the purchaser, of a copper alloy containing not less than 75 percent copper, such as UNS C89510, C89520, C89833, or C89836, or a similar copper alloy as listed in ASTM B584; or of steel in accordance with ASTM A276.
4.1.10 Automatic valves. Te valve weights shall be of a copper alloy con- taining not less than 75 percent copper, such as UNS C89510, C89520, C89833, or C89836, or a similar copper alloy as listed in ASTM B584, or a completely enclosed copper-alloy shell loaded with lead; a stainless steel as listed in ASTM A580; ductile iron as listed in ASTM A536; or cast iron as listed in ASTM A126. Te valve and supplemental hinge pins or spindles shall be of a copper alloy con- taining not less than 75 percent copper as listed in ASTM B584; or of stainless steel as listed in ASTM A580 or ASTM A276; or of monel. Valve and supple- mental weight-hinge bearings shall be bushed with hard rubber, as classifed in accordance with ASTM D2000; or with bronze in accordance with ASTM B139; or with other suitable bushing material. If the valve contains a clapper, it shall be faced with a removable semihard seat. Valve seats shall be made of a copper alloy containing not less than 75 percent copper, such as UNS C84400 as listed in ASTM B584; or of a suitable engineering plastic, such as acetal in accordance with ASTM D4181, polyphenylene oxide in accordance with ASTM D4349, or polycarbonate (PC) in accordance with ASTM D3935. If the meter has a spring- loaded automatic valve, the valve design shall meet all applicable elements of the above standard requirements.
4.1.11 Bypass check valve. Meters using a bypass system shall be pro- vided with a check valve in the piping downstream of the bypass (low-fow mea- suring) meter. Te check valve interior mechanisms shall be of a copper alloy, such as UNS C89510, C89520, C89833, or C89836, or a similar copper alloy as listed in ASTM B584, or other suitable nonferrous material, such as rubber, as classifed in ASTM D2000. Te check valve shall efectively prevent reverse fow and shall not bind or stick while in service. Te check valve shall be of sufcient size to be used to test either the main line or the bypass meter at the fow rates required by AWWA for the respective meters. If the bypass check valve cannot be used to perform in-line feld testing at the required AWWA fow rates, a separate plug shall be provided.AWWA C703-15 pdf download.