Compound meter (AWWA standard)
OPERATION: NWM PMCB Bronze Compound Meters utilize a turbine type meter on the main flow line and a proportionately sized meter on the low flow bypass line. A change over valve controls the flow of water through the appropriate measuring device. Before the valve opens, all water flows through the low flow meter. As pressure rises the valve opens, allowing water to flow through both meters. Movement of the measuring elements is transmitted to drive magnets, which transmit the motion to driven magnets located within hermetically sealed registers. The magnets are connected to gear trains, which translate the rotations into volume totalizators displayed on the register dial faces.
NWM PMCB Bronze Compound Meters utilize a turbine type meter on the main flow line and a proportionately sized meter on the low flow bypass line. A change over valve controls the flow of water through the appropriate measuring device. Before the valve opens, all water flows through the low flow meter. As pressure rises the valve opens, allowing water to flow through both meters. Movement of the measuring elements is transmitted to drive magnets, which transmit the motion to driven magnets located within hermetically sealed registers. The magnets are connected to gear trains, which translate the rotations into volume totalizators displayed on the register dial faces.
CONSTRUCTION: NWM PMCB Bronze Compound Meters consist of a main case, turbine measuring element, changeover valve housing, main case cover, multi-jet type meter, and magnetically driven register assemblies. The main case, changeover housing and bypass meter are cast in brass or bronze. The measuring element assembly includes the rotor assembly, vertical shaft and a calibration vane which eliminates the need for calibration change gears. The Plastic Register Cover and Register Shroud are plastic, the Brass Register Cover and Register Shroud AS OPTION.