Rapidrop threaded butterfly device designed for controlling fluid passage rotary type valve with visual indication of whether the valve is in totally exposed stance or not butterfly valves are often employed in fire protection systems as system zone valves, Control valves. These These valves feature a design that significantly limits flow resistance and pressure loss while in use in With a fully rapidrop butterfly, Open configuration valves are crafted to stop water hammer by incorporating a controlled closing action hand wheel operation gearbox. Features all valves are mounted with an integral pre, Wired supervisory tamper switch assembly. The tamper switch signal movement related to the valve disc from the fully open position switch rating 10. 1 amps, 125/250vac, 60hz, Actual switch application rating 10 amps/115 vac, 60hz0. 5 amps/28 vdc all valves are furnished with tamper switch assemblies forDesigned designed for application inside and outside use a 1/4 turn valve with slow closing and opening to prevent bronze butterfly valve can additionally be found with grooved ends