International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 452
t the water from entering throughthe suction valve, the pressure on the top of the valve beinggreater than that of the atmosphere below. In the pumpshown in the figure, the plunger is a trifle smaller than thecylinder, and the air collects around the plunger below thestuffing-box. To remove this… … PNEUMATICS. 441 cock must not be opened, except during the down stroke ofthe plunger; for, if it were open during the up stroke, thepressure below the plunger being less than the pressure ofthe atmosphere above, the air would rush in instead of beingexpelled. 1083. Double-Acting Pumps.—In the pumps…
Railroad engineering
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