Siemens 599-10601-1.9-4.0 6W BALL VALVE 3/4", A=1.9CV, B=4.0CV, 58PSI CLOSE-OFF, FEMALE NPTSiemens 599 10601 1. 9 4. 0 6W ball valve 3 4", A=1. 9Cv, B=4. 0Cv, 58psi close off, female NPT This 3 4 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 = 4. 0 Cv, linear flow characteristic and chrome plated brass ball and stainless steel stem and Cv washers. There is a handle