Siemens 171E-10357S 599 SERIES 3W, 1/2", 10CV STAINLESS STEEL BALL VALVE, 2-POS, SRSiemens 171E 10357S 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 10 Cv, full port valve without flow characterizer insert, with stainless steel ball and stem and an operating handle that can manually