Questions and answers on pumps and pumping machinery (1912)
Wakeman, William Henry, 1855- [from old catalog] · Chicago, The Joseph G. Branch publishing company · leaf 183
by force of gravity. 605. Q. Does the same force affect the pistons?A. Yes; consequently less steam is required on the downward stroke. 606. Q. Does this cause a pump to pound at thelower end? A. No; because the valve is given more lead atthat end, hence the descending piston is cushioned ona… … F»G.//f 608. Q. Why is this necessary?A. When the steam piston is descending, steammust be admitted to overcome resistance in the water PUMPS AND PUMPING MACHINERY. 173 pipes, minus the weight of both pistons, the rod, etc.When ascending, the same resistance must be over-come, plus the above…
Pumping machinery
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