液壓裝置-外文資料翻譯-液壓系統(tǒng)(留存版)
【正文】 e ported specially to obtain prepression, and with some it is not possible at all. Without prepression, as soon as the delivery port opens, the gas in the delivery pipe expands back into the pump, and the whole volume has again to be pressed. A rotary pressor with prepression cannot be operated with hydraulic fluid. d. Provision for air or water cooling of the cylinder so that the temperature of the air in the pressor may be kept as near isothermal as possible, and the volume of air being delivered correspondingly increased. This is a feature not normally necessary on a hydraulic pump. e. Means for controlling gas leakages during pression either by piston rings on a reciprocating piston pressor, or fine clearances on the rotary types. f. Adequate inlet valve to prevent throttling of the ining air, with the consequent loss of volumetric eff
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