Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 634
, have recentlyintroduced a system of hydraulicaly operated valves forspeed regulation. These valves are also of the poppet type, and each isclosed by a helical spring in compression. In the closedposition they are held tight by steam pressure, againstwhich they are opened. The valves on one… … Fig. 261cam shaft is rotated by the piston in a hydraulic cylinder,the cylinder being mounted either on the generator orvalve casing. 622 Steam Engineering The valves open gradually; that is there will he throt-tling on the opening, or closing valve, before the next onein either side is opened or…
