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Title: Application And Operation Of Ball Valve Regulators
Author: William G. Birkhead
Source: 1971 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1971
Abstract: For many years inefficient control valves or regulators were used. As a result of this inefficiency, very little attention was given to minor losses. As more efficient control valves (ball valves) became available, these minor losses (fittings, elbows, tees, swages, etc.) have become more important. Over one hundred years ago, H. Darcy proposed that the head lost in etny closed filled conduit was proportional to its length times a friction factor divided by its diameter, all timea one-half the average fluid velocity head.

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