Siemens 171E-10351 599 SERIES 3-WAY, 1/2", 0.63 CV BALL VALVE, 2-POS SPRING-RETURN ACTUATORSiemens 171E 10351 This 599 Series 3 way ball valve with a spring return two position 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 0. 63 Cv, with chrome plated brass ball and brass stem and an operating handle that can manually operate valve in the event of power