Siemens 171G-10356 599 SERIES 3W, 1/2", 6.3 CV BALL VALVE, PROPORTIONAL SPRING-RETURN ACTUATORSiemens 171G 10356 This 599 Series 3 way ball valve with a spring return proportional 0 10v 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 6. 3 Cv, with chrome plated brass ball and brass stem and an operating handle that can manually operate valve in the event of