Siemens 599-10600-1.9-0.5 6W BALL VALVE 1/2", A=1.9CV, B=0.5CV, 58PSI CLOSE-OFF, FEMALE NPTSiemens 599 10600 1. 9 0. 5 6W ball valve 1 2", A=1. 9Cv, B=0. 5Cv, 58psi close off, female NPT This 1 2 inch 599 Series 6 way ball valve is used to control hot and chilled water and up to 50% Glycol solution in chilled heated beams and other four pipe systems using a single valve and actuator. Source A = 1. 9 Cv and Source B = 0. 5 Cv, linear flow characteristic and chrome plated brass ball and stainless steel stem and Cv washers. There is a handle