By Tim Daly According to Meriam Webster’s online dictionary (m-w.com), the word “valve” is defined as: “ any of numerous mechanical devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways; also: the movable part of such a device.” Of all components in mechanical systems, valves are the most numerous,...
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