Standard full or reduced port Ball Valves are unsuitable to use for modulating control due to their large Cv’s and can result in poor control through most of their opening/closing range. However, a V-port or V-notch Ball valve has significantly reduced Cv values and when used in conjunction with an actuator and I/P positioner, can be used as an economically priced control valve for modulating duty.
Components for modulating assembly are:
Valve- Apex 3-8T, 3-piece 30° or 60° V-port, 1,000 psi (69 bar) Ball Valve, ISO5211 direct mount, 316ss body/ball/stem, TFM1600 seats, PTFE seals, bsp ends (SW or BW optional)
Sizes- ½” (DN15) → 2″ (DN50)
Actuator– Prisma PA series DA or SR (if fail open/close required)
Positioner– YT-1000R (positions in response to 4-20mA signal)
Piping- Generally ¼” st/steel tube with Hylok tube fittings (nylon tube with plastic fittings optional), Filter Regulator and Pressure Gauges