Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 302
plumb ; adjust the supplem.ental valve so as tocover equally all the posts, which is done by lengthening orshortening its valve stem. THE NATIONAL. The main valve in this pump is moved by steam actingupon a valve piston. The steam admitted to and released from the auxiliary cylinder iscontrolled by… … Fig. 269. manner. In this pump the usual collars and tappets on thevalve stem are dispensed with, the stem receiving motion 304 Pumps and Hydraulics. by means of a roller carried by a slide block to which the valvestem is attached. The roller is given a lateral motion by set screws in theforked…
Hydraulic machinery · Pumping machinery
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