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Reader:
Topic: Selecting a control valve with actuator Application: Control valve to maintain liquid level in a 7,000 gallon tank. Draw down rate varies, but averages 100 GPM.
Product: Grape juice.
Valve construction: 3" Size. Wafer body is OK. Easily cleanable, but does not need to meet 3A Dairy Standards.
Question: What type of valve is suitable? Ball? Ball with Vee notch? Butterfly? Other options? I have heard that ball and butterfly valves are good for full open and close off applications, but not great for throttling.
Bob Donnelly:
We recommend a Flo-Tite 3 inch Multi-Choice Sanitary Ball valve with a 15 degree V port with a cavity filler, virgin TFE seats and seals with a lever handle. The modulating V-ball provides accurate control of the downstream flow rates, from simple On-off to modulating control applications.
Valve automation pioneer Bob Donnelly has built several brands into market leaders in their respective niches in the process control automation market in North America. As vice president of marketing at 
