介绍了设计原则、实现途径和极限真空估算。
The design principle, the way to carry out and estimation of limited vacuum were introduced.
环境温度较高时，油温升高，粘度下降，饱和蒸汽增大，会引起极限真空上升，应加强通风散热。
Higher temperature, oil temperature increase, decrease viscosity, steam increased, the limit will cause a vacuum up, we should strengthen the ventilation cooling.
真空抽气系统抽气性能的好坏直接影响RH-KTB精炼的脱气、脱碳、脱氮的效果，极限真空度高低决定了钢水最终的气体含量。
Vacuum extraction system of extraction performance affects behavior of degassing , decarburization, denitriding and so on in RH_KTB refining process.
所以说，光速可以减慢却不能加快：真空好比是自然界的康庄大道，光便以其极限速度疾驰在这条大道上。 欧洲粒子物理研究所的实验室里到底发生了什么？
So light can be slowed down, but not sped up: the vacuum is nature's open road where light travels at the speed limit.
介绍降低吸气剂真空感应熔炼系统极限压力的措施和效果。
Describes how to reduce the ultimate pressure for a vacuum induction getter melting system and discusses the (effects) of the measures taken for improvement of several systems.
在此基础上，比较了真空提水的极限深度和真空预压有效加固深度的不同，分析了真空预压有效加固深度大于真空提水极限深度的原因。
On this basis, the difference between the limited lift by vacuum pumping and the effective depth of vacuum preloading is analyzed and the reason of the latter may greater than the former is analyzed.
分析了不同电源条件下的弧后电流。文中指出，扩散型真空电弧的分断极限是由电击穿决定的，而不由弧后电流引起的热击穿所定。
It has also been found that diffused vacuum arcs with a high current gives a low post-arc current and that the limitation to the breaking capacity for dif…
KT- 400高真空油扩散泵，它的特点是真空极限高，抽速大，提高生产效率，同时真空气动阀门采用自动控制。
KT-400 high vacuum oil diffusion pump, which is characterized by extreme high vacuum, pumping speed large, increase production efficiency while the vacuum pneumatic valves with automatic control.
KT- 400高真空油扩散泵，它的特点是真空极限高，抽速大，提高生产效率，同时真空气动阀门采用自动控制。
KT-400 high vacuum oil diffusion pump, which is characterized by extreme high vacuum, pumping speed large, increase production efficiency while the vacuum pneumatic valves with automatic control.
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