Siemens 171H-10300S 2W 1/2", 0.4CV BALL VALVE ASSEMBLY, STAINLESS STEEL BALL & STEM, 2-POS, NO, SRSiemens 171H 10300S This 599 Series 2 way ball valve with a 2 position control, normally open, fail safe actuator assembly, providing 200 psi close off, is used to control hot or chilled water and up to 50% Glycol solution in convectors, fan coil units, unit conditioners, radiation and reheat coils. This 1 2 inch valve is 0. 4 Cv, equal percentage flow characteristic, with stainless steel ball and stem, and an operating handle that can manually