Siemens 171N-10307S 599 SERIES 2W, 1/2", 10CV NO STAINLESS STEEL BALL VALVE, 2-POS, SR ACTUATORSiemens 171N 10307S This 599 Series normally open 2 way ball valve with a spring return two postion (on off) actuator assembly equipped with dual end switches, 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