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

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Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary (taps of the lift-valve type F16K1/00) > Details > Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve