Abstract
This paper is concerned with the design of hydraulic systems of the type containing one or more rams or rotary motors driven by a pump having a relief valve or other means of controlling the flow so as to limit the pressure. The choice of working pressure is discussed and it is concluded that there is no inherent advantage in the use of high pressures analogous with that of high voltages for electrical power transmission.
The other factor investigated is the selection of pipe and valve sizes. The customary use of a standard flow velocity as a guide for this purpose can give very unsatisfactory results. As a better basis, an estimate of the allowable pressure loss is recommended, this being obtained from considerations of efficiency or from a novel parameter, ‘hydraulic regulation’. The latter is the ratio of the pressure loss at full working speed to the maximum pressure, and is a measure of the extent to which a system slows down under heavy loads.
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