Valves open on one side only. justify'
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valves open one side because they are only present in veins to not to allow back flow of blood
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They are quick-opening and require only a quarter-turn to open or close. ... If the valve is left partially open for an extended period under a high pressure drop ... valve is generally low enough that the additional cost of a full port valve is not justified. ... Alternatively a “freeze-tolerant” ball valve in which a plug in the side
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