Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 328
Figs. 298, 299. 330 Pumps and Hydraulics. the valve piston becomes so leaky as to render the action ofthe pump uncertain and the time when the worn valve is re-placed by a new one that the pump is very wasteful of steam. The valve piston in this pump is provided with packingrings, E, E, which…
Hydraulic machinery · Pumping machinery
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