Siemens 172E-10330S 2W 2", 160CV BALL VALVE ASSY, STAINLESS STEEL BALL, STEM, 2-POS, NC, SRSiemens 172E 10330S This 599 Series 2 way ball valve with a 2 position control, normally closed, 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 2 inch valve is 160 Cv, equal percentage flow characteristic, with stainless steel ball and stem, and an operating handle that can manually operate