Siemens 171B-10325S 2W 1-1/2", 100CV BALL VALVE ASSY, STAINLESS STEEL BALL AND STEM, FLOAT NSRSiemens 171B 10325S This 599 Series 2 way ball valve with a floating control fail in place 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 1 2 inch valve is 100 Cv, equal percentage flow characteristic, with stainless steel ball and stem, and an operating handle that can manually operate the valve