The Siemens 171A-10302S Control Valve is a 2-way 1/2 inch, 1 Cv ball valve assembly with stainless steel ball and stem, floating fail-in-place actuator, and 200 psi close-off pressure. It offers 0.4 to 160 Cv ranges depending on valve size, 600/WOG/ANSI 250 pressure rating, double o-ring stem packing, blow-out proof stem for high pressure safety, and thermal barrier on universal mounting bracket.