液壓裝置-外文資料翻譯-液壓系統(tǒng)(完整版)
【正文】 eing discharged, and will thus adversely affect not only the output of the pump, but the maxium pressure that can be achieved. b. Except on lowpressure pumps, two or more stages of pression with as much intercooling between stages as possible. This is desirable, firstly, to reduce the wastage of work and output due to the gas being pressed adiabatically instead of isothermally and, secondly, to reduce the overall loss of output due to clearance volume. c. Prepression of the air in the pump up to the pressure of the delivery line. Although the normal reciprocating pump with an automatic or springload delivery valve will ensure this some of the rotary pressors have to be 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 expand
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