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The so-called vacuum, is given space, gas pressure below 101325Pa state. Under vacuum, the pressure of the gas, the fineness usually expressed in natural gas, obviously the ghost story, the smaller the pressure value, the denser the gas. There are many varieties of industrial vacuum pumps, pump performance testing methods need to test the main parameters: 1, the ultimate vacuum (often referred to as vacuum): After the connection of the vacuum vessel and the test, bin Laden for a long time continuous pumping, Buried in the northern Arabian Sea after the test gas, when the gas pressure in the container does not drop in order to maintain a certain value, this pressure is called the ultimate vacuum pump. A smaller value indicates closer to the theoretical vacuum. 2, pumping speed: at the suction port, the volume of gas through the vacuum unit of time. Extensive industrial use of large numbers of conventional vacuum pumps, pump work requires special vacuum pumps, lubricants, oil and natural gas contained in the Council a lot of mist. With the development of industrial instruments and human requirements of environmental protection, micro-state came into existence oil-free vacuum pump, generally have the following rules: Vacuum pump price and index are closely related. The vacuum indicator is an important indicator pursued by the state and it reflects the overall strength of the corresponding processing, sealing technology, materials science and other fields, but also an important means for manufacturers to make profits. Indicators to increase the vacuum, we must have higher sealing conditions, so the need to take more accurate size, better performance of the parts, so the substantial increase in production costs of materials. The increase of the price index is much larger than the increase in the vacuum. Of course, increased extraction rates will result in higher prices, but their growth will not. Therefore, the choice requires careful formulation of the mini-vacuum pump index, followed by the pumping speed, with the best balance between performance and cost. High-vacuum micropumps use a very precise seal because of its higher ambient operating conditions, temperature parameters, media composition, and more. Vibration and noise. Vacuum pump pumping speed and high vibration and noise levels are also greater. Zhejiang vacuum pump plant related articles to read: Vacuum pump industry standards (a) of the vacuum pump industry standards (b) of the cause of the corrosion of the vacuum pump and solution Vacuum pump selection Vacuum equipment maintenance and repair Copyright: Reprint miniature vacuum pump is how the definition and standard articles When the link must be in the form of the author and the original source Zhejiang Vacuum Pump Factory.