[census Reports] Tenth Census. June 1, 1880

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33 the auxiliary valve lies between the main valve and its seat. This movable seat is moved when chocks upon a rod are struck by a tappet-arm clamped to the main piston-rod. This seat has through ports, matching the ports iu the lower face, and upon one side are projecting lugs which are faced to a joint with the lower seat. These alternately open and close connections to the spaces at the heads of the auxiliary cylinder. Similar projections on the other side carry exhaust-hollows for properly ...opening these spaces to the exhaust of the pump through a second pair of passages in the walls of the casting. It will be at once seen that the main valve of the D-form will be thrown by steam when the movable seat and auxiliary valve admits steam to one end of the auxiliary piston and connects the other end to the exhaust. The motion of the auxiliary piston is cushioned as before by its own exhaust, inasmuch as it covers over the exhaust-outlet before it has completed its travel. The exhaust-passages are shorter than those carrying live steam.

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