I opened this topic for discussion on the criteria for use of valves. Usually there is always only the literature on the constructive part of the valves, and almost never on the criteria for selection and use of valves. Does anyone know any simple criterion or book, or form that describes a simple part of the process, use, classification and selection of valves? When using globe or butterfly. Available in the literature says that butterfly does not have good sealing properties, but manufacturers are already saying that their butterflies have excellent tightness. Already in the gas lines are not recommended. There is a criterion, link, site, a book that explains this process more fully?
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