Siemens 171G-10321 2W 1-1/4", 100CV BALL VALVE ASSY, CHRM-PLAT BRASS BALL, BRASS STEM, 0-10V NO SRSiemens 171G 10321 This 599 Series 2 way ball valve with a 0 10 Vdc 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 1 4 inch valve is 100 Cv, full port valve without flow characterizer insert, with chrome plated brass ball and brass stem, and an operating handle