Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve

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Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing (F16K5/00 takes precedence; in barrages or weirs E02B8/04) > Details > Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve