The Bell & Gossett CIRCUIT SETTER "RF" calibrated balance valve is a precision machined ball type, triple purpose balancing instrument. It is precisely calibrated for use as a presettable balance valve, variable orifice flow meter and positive shut-off service valve for low flow applications. Valves are furnished with a calibrated nameplate and memory stop indicator. This permits the valve to be preset to a fixed open position and then closed for service without disturbing valve settings. Valves are equipped with capped readout valves fitted with internal check valves, and an NPT tapped and plugged drain port.