International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 451
ing-box, asshown at S, and also necessitates the rod being round, inorder that the water may not leak out. 1081. Force Pumps.—The force pump differs fromthe lifting pump in several important particulars, butchiefly in the fact that the piston is solid; that is, it has novalves. A section of a… … Pig. 208.opens the valve V and forces the water up the delivery pipeP. When the piston again begins its upward movement,the valve V is closed by the pressure of the water above it,and the valve Fis opened by the pressure of the atmosphereon the water below it, as in the previous cases. For…
Railroad engineering
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