Abrasive blast metering valves; Control valve for applying an abrasive material under pressure; Valves of metal other than parts of machines including those from alloy steel and titanium; calibration marking device for calibrating media blasting system metering valves, namely, a device in the nature of a scale that provides a visual indicator of how opened or how closed a valve is for use in monitoring the amount of abrasive media flowing through a valve and for accurately positioning the valve stem to control an integral component of manually adjustable fluid control valves for forcibly propelling a stream of abrasive material under pressure toward a surface to be cleaned or treated; abrasive metering valves having an indicator feature, namely, a calibration marking device in the nature of a scale that provides a visual indicator of how opened or how closed the abrasive metering valve is; Control valves for blast cleaning machines; Valves, namely, valves for industrial equipment; Valves, namely, valves for abrasive blasting machines; Control valves for blasting equipment