As the Roots pump is a non-vacuum inside the compression, the compression ratio is usually very low, so high, medium and vacuum pumps need to pump before.
由于罗茨泵是一种无内压缩的真空泵，通常压缩比很低，故高、中真空泵需要前级泵。
Vacuum pump is a relatively sophisticated equipment, it's working medium is a special high boiling point, low-volatile oil pump, its effectiveness depends on the mechanical pump and pump oil quality.
真空油泵是一种比较精密的设备，它的工作介质是特制的高沸点、低挥发的泵油，它的效能取决于油泵的机械结构和泵油的质量。
The Neutral Beam Injection (NBI) system requires a clean high vacuum environment. The liquid helium cryocondensation pump with high pumping speed is an ideal vacuum obtain device.
中性束注入系统要求有洁净的动态高真空环境，大抽速液氦冷凝泵是满足此要求的理想真空获得设备。
A high vacuum composite technique for the production of salt under vacuum was designed, its unit flow, working principle, function of cooling tower and vacuum pump were introduced.
设计了一种用于真空制盐的新型高真空组合技术，介绍了该技术的装置流程、工作原理及凉水塔、真空泵等设备的功能。
Water-ring vacuum pump usually gets steam-erosion in summer due to high temperature of working-water, which affects its safe and steady operation.
水环式真空泵在夏季往往因工作水温度高发生汽蚀，影响设备安全稳定运行。
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。
Allows a high degree of vacuum suction on the Hs is p1 pressure pump at the entrance to allow the greatest vacuum.
允许吸上真空高度Hs是指泵入口处压力p 1可允许达到的最大真空度。
If the vacuum reached 100pa level, should be equipped with high-power vacuum pump.
若真空度达到百帕级别，须配置大功率的真空泵。
If the vacuum reached 100pa level, should be equipped with high-power vacuum pump.
若真空度达到百帕级别，须配置大功率的真空泵。
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