The principle and characteristics of the high temperature air generator is introduced. The PLC control project of periodical shift of the cross valve is expounded.

介绍了高温空气发生器的工作原理与特点，提出了采用可编程序控制器(PLC)控制四通阀周期切换的控制方案。

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In addition, the measurement on pressure loss cross one side of four-way diverter valve has been carried out and some questions on pressure loss of four-way diverter valve are posed.

同时，也对四通换向阀进行了单侧压力损失测量，对四通换向阀说明书上的压力损失参数的准确性提出了质疑。

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The two halves shall be sealed by diamond shaped cross section rubber gasket permanently locked by a groove in the valve body.

阀体的两个部分应该采用钻石形交叉橡胶垫圈通过阀体的卡箍永久性锁定密封起来。

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New Cross Hospital hopes to carry out 30 mitral valve repairs a year using the robot that is already employed in other operations at the hospital.

BBC: Da Vinci robot heart surgery at New Cross Hospital

Without the safety valve of legal visas, making it harder to cross the border has mostly succeeded in encouraging people to stay (rather than cross back and forth) once they make it across the Southwest border.

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