Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 304
and auxiliary valves are both flatslides, each covering five ports, as shown in Fig. 271. Themain valve is actuated by means of a valve piston, the steambeing admitted to and exhausted from the ends of the valvepiston in precisely the same manner that the main valve con-trols the admission and… … Fig. 271. the inner ones exhaust. When the auxiliary valve reaches theupper end of its travel, as shown in the engraving, the admis-sion port opens at the bottom of the steam chest, while the oneat the top closes. At the same time, the upper end of the main cylinderis open to the exhaust. The…
Hydraulic machinery · Pumping machinery
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