Siemens 172P-10316S 599 SERIES 2W, 1", 63CV NC STAINLESS STEEL BALL VALVE, 2-POS, SR ACTUATORSiemens 172P 10316S This 599 Series normally closed 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 inch valve is 63 Cv, full port valve without flow characterizer insert, with stainless steel