工作压力的选定 Selection of work pressure 泵的额定压力是指泵连续工作时的最高许用压力，而其工作压力则决定于外部负载，泵的寿命与其工作压力直接相关。
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The use of the code pressure equation and the definition and selection of terms are reviewed as you work through this tutorial.
通过本教程学习了使用规范中的压力方程及其定义和选择的条款。
Performance experiments about ZY47 pressure -difference control valve and ZL47 flux control valve have been done, based on their structure and work principle, presented the method of type selection.
对ZY 47型自力式压差控制阀和ZL47型流量控制阀进行了性能实验，并依据它们的结构特点和工作原理，提出了选型方法。
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