This standard describes the various types and classes of cold water displacement meters with bronze main cases, in sizes 1/2 in. (13 mm) through 2 in. (50 mm), and the materials and workmanship employed in their fabrication. The displacement meters described, known as nutating disc or oscillating piston meters, are positive in action because the pistons and discs displace or carry over a fixed quantity of water for each nutation or oscillation when operated under positive pressure.
ANSI/AWWA C700-2009 history
2020ANSI/AWWA C700-2020 Cold-Water Meters— Displacement Type, Metal Alloy Main Case
2009ANSI/AWWA C700-2009 Cold-Water Meters - Displacement Type, Bronze Main Case