171K-10311S | 2W 3/4", 25Cv ball valve assy, stainless steel ball, stem, 2-10 V, NO, SR | Siemens

This 599 Series 2-way ball valve with a 2-10 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 3/4-inch valve is 25 Cv, full-port valve without flow characterizer insert, with stainless steel ball and stem, and an operating handle that can manually operate the valve in the event of power failure.