REGULATION OF STEAM . 123 part of the stroke of the piston , when we have , as in the figure , the diameter of the eccentric path much greater than the diameter of the crank path . It thus becomes apparent that the valve must be … Fig . 67 . — DIagram of the Lap of Valves . altered , the multiple - ported type being adopted . Thus , by intro - ducing three steam ports at each end of the valve , with one central exhaust port , we gain the same area of port on the valve , while the opening of each port is only one - third of…
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