The hydrodynamic condition and the sucking vacuum that may ap- pear in such a system are further analyzed and calculated here by means of the water pressure chart and the Bernoulli equation.
本文针对在实际使用过程中可能出现的问题，应用水压图及伯努里方程，对应用水射器补水加压的热水供暖系统水力工况、吸上真空度等进行了分析和计算。
Through the analysis and comparison of water pressure chart of press boiler and no-press boiler, it is found that their main difference is circulating pump delivery, namely different consumption.
通过对无压锅炉与有压锅炉供热系统水压图的分析和比较，发现二者的主要区别在于循环水泵的扬程不同，即循环能耗不同。
The article particularizes the theory, configuration and use ways of turnover drill press clamp under the control of PLC. And finally shows the trapezoid drawing of PLC and hydraulic pressure chart.
详细说明了基于P LC控制的自动翻转夹具的原理、结构和使用方法，并结合实例给出了PLC的梯形图和液压原理图。
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