I am trying to get opinions on what would be best practice for a chilled water line. The company I work for says that a valve of 2 1/2" should be a butterfly valve. I have learned recently that a ball valve would be less expensive to purchase. What are the rest of you doing in this circumstance? Do you go with cost only or is there something else I am missing(hence the reason to use a butterfly valve for this app) Thanks. My valve selection applies to regulatory control and automated shutdown valves. Butterfly valve consideration applies to lines NPS 10 and larger. My preference would be ball valves through NPS 36 but the initial capital cost is much higher for large ball valves. If I select a butterfly valve it is normally flanged or lugged to avoid wafer valves in flammable hydrocarbon or hazardous chemical applications. It will be used cut off the line and capped for future use. We will be adding an A/C unit at a later date. Pressure is about 60 psi. 2-1/2" is small for a butterfly valve. The shaft in a valve that size will cause a significant pressure drop. I would use a ball valve for On/Off or a globe valve for throttling. As others have said we need more details.

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