Abstract
Abstract This paper suggests a method of figuring the strength of hydraulic pipe, valves and fittings based on the maximum-shear theory modified to conform to the results of the experiments of Cooke and Robertson published in “Engineering,” December 15, 1911, and shows it applied to a system to use 7500 lb. per sq. in. working pressure. It describes the joints, fittings and valves used on this system, both those that proved satisfactory and those that failed in operation. It also shows and describes a multiple cam-operated valve for use with a three-cylinder press, so arranged that a continued rotation of the valve-operating wheel in one direction operates the individual cylinders of the press through a complete cycle of operations, thus largely eliminating the personal equation of the operator. An auxiliary valve used to speed up the return stroke of the large cylinder of this press is also described. The design of a system in which an accumulator is used is discussed and the special precautions required to avoid water hammer considered.
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