Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 393
state of rest, with some suddenness and shock. To preventthis in large valves, there is a valve and small by-pass pipe, from one side tothe other of the valves, by opening which the pressure on the two sides of thevalve may be equalized, and the excess due to the starting of the pump dis-tributed.… … Fig. 861.
Mechanical drawing
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