Siemens 171A-10359 599 SERIES 3W, 3/4", 10 CV BALL VALVE, 3-POSTION FLOATING, NSR ACTUATORSiemens 171A 10359 This 599 Series 3 way ball valve with a non spring return 3 position (floating) actuator assembly, providing 200 PSI close off, is used to control hot or chilled water and up to 50% Glycol solution in air handlers, convectors, fan coil units, unit conditioners, radiation and reheat coils. This 3 4 inch valve is 10 Cv, with chrome plated brass ball and brass stem and an operating handle that can manually operate valve in the event of