Honeywell VBN2BL3S0X Two-Way Female NPT Actuated Control Ball Valve. The 3/4 In. VBN2 Two-Way Control Ball Valves control hot and chilled water in HVAC systems to provide two-position or modulating functions. Its unique construction enables a smoother flow curve and greater degree of rotation responsiveness. The result: more accurate flow rate with less wear and tear. And Honeywell's Cv ratings are similar to globe valve Cv ratings, making it easier to design your system using a ball valve.