Siemens 171C-10301S 2W 1/2", 0.63CV BALL VALVE ASSY, STAINLESS STEEL BALL AND STEM, 0-10V NSRSiemens 171C 10301S This 599 Series 2 way ball valve with a 0 10 Vdc 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 2 inch valve is 0. 63 Cv, equal percentage flow characteristic, with stainless steel ball and stem, and an operating handle that can manually operate the valve
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