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对外混式自吸泵回流孔面积进行对比试验,确定最佳方案。阐述关闭回流孔的橡胶阀原理及设计方法,进行装阀前后的对比试验。
Foreign mixed self-priming pump reflux hole area comparative test to determine the best solution. Explain the principle and design method of rubber valve to close the backflow hole, and carry out comparative test before and after loading the valve.