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 pressurechart and the Bernoulli equation.
Through the analysis and comparison of water pressurechart of press boiler and no-press boiler, it is found that their main difference is circulating pump delivery, namely different consumption.
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 pressurechart.