Siemens 171A-10353 599 SERIES 3-WAY, 1/2", 1.6 CV BALL VALVE, 3-POS FLOAT, NSR ACTUATORSiemens 171A 10353 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 1 2 inch valve is 1. 0 Cv, with chrome plated brass ball and brass stem and an operating handle that can manually operate valve in the event