译文：
真空泵选择的注意事项 1、真空泵的极限压力应该满足该工艺的工作压力。通常选择泵的极限压力低于工艺要求约一个数量级。 2、每种泵都有一定的工作压力范围，因而，泵的工作点应该选在这个范围之内，而不能让它在允许工作压力以外长时间工作。 3、真空泵在其工作压力下，应能排走真空设备工艺过程中产生的全部气体量。 4、选择真空机组： （1）当使用一种泵不能满足抽气及真空要求时，需要几种泵组合起来，互相补充才能满足工艺要求。 （2） 有的真空泵不能在大气压下工作，需要预真空；有的真空泵出口压力低于大气压，需要前级泵，故都需要把泵组合起来使用。经组合使用的真空泵，我们称之为真空泵机组，它能使真空系统得到较好的真空度及排气量。我们应正确地选择组合的真空泵，由于不同的真空泵对抽除的气体要求有不同的要求，例如：在一般情况下罗茨－旋片机组不适用于含有较多可凝性气体的系统。 5、当您选择油封泵时，您应该首先了解您的真空系统是否对油污染有要求。若设备严格要求无油时，应该选各种无油泵，如：水环泵、低温泵等。如果要求不严格，可以选择有油泵，加上一些防油污染措施,如加冷阱、挡油阱、挡板等，也能达到清洁真空要求。 6、了解被抽气体成分，气体中含不含可凝蒸汽，有无颗粒灰尘，有无腐蚀性等。选择真空泵时，需要知道气体成分，针对被抽气体选择相应的泵。如果气体中含有蒸汽、颗粒、及腐蚀性气体,应该考虑在泵的进气口管路上安装辅助设备，如冷凝器、除尘器等。 7、当选择油封真空泵时，要考虑真空泵排出来的油蒸汽（油烟）对环境的影响如何。如果环境不允许有污染，应该选无油真空泵，或者把油蒸汽排到室外。 8、真空泵工作时产生的振动对工艺过程及环境有无影响，若工艺过程不允许，应选择无振动的泵或者采取防振动措施。 9、真空泵的价格、运转及维修费用。 在我们考虑到了各种情况后，才能{zh1}确定一个适应于您的解决方案： （1） 最小的投资费用。 （2） 最小的生产运行费用。 （3） 将前两种情况合理均匀分配的可行方案。

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原文：
Note vacuum pump of choice 1, vacuum pump limit pressure should meet the pressure of the process. Often choose to pump below the process requirements limit pressure of about one order of magnitude. 2, each pump has a certain amount of working pressure range, therefore, the pump operating point should be chosen within this range, but not allowing it to work long hours outside of work pressure. 3, vacuum pump in its work pressure, vacuum equipment should be able to discharge all the process gases produced. 4, choose the vacuum unit: (1) When using a pump and vacuum extraction can not meet the requirements, needs a few pumps combined to complement each other in order to meet the technological requirements. (2) Some vacuum pumps can not work under atmospheric pressure, to be pre-vacuum; some pump outlet pressure below atmospheric pressure, need to pre-stage pump, ancient capital of the need to combine the use of pumps. The combination of the vacuum pump, which we call vacuum pump unit, it can get a better vacuum system vacuum and exhaust. We should choose the right combination of vacuum pumps, vacuum pumps due to the different demands on the extraction of gas have different requirements, for example: under normal circumstances Roots - Rotary Vane does not apply to contain more units may be condensable gas system. 5, when you choose to seal pump, you should first understand your vacuum system is required for oil pollution. If the equipment demanding oil-free, they should select a variety of non-oil pump, such as: water ring pumps, cryogenic pumps. If the requirement is not strict, you can choose a pump, coupled with a number of oil pollution prevention measures, such as the Canadian cold trap, block the oil trap, baffle, etc., but also can achieve clean vacuum requirements. 6, understanding has been pumping gas composition, gas condensate steam containing non-can, with or without particles of dust, with or without corrosive and so on. Select vacuum pump, you need to know the gas composition, select the appropriate response has been pumping gas pump. If the gas contains steam, particles and corrosive gases should be considered in the pump inlet pipe on the road to install auxiliary equipment, such as condensers, filter and so on. 7, vacuum seal when you select must be considered when discharged from vacuum pump oil vapor (fumes) on the environmental impact of how the. If the environment does not allow pollution, oil-free vacuum pump should be selected, or the oil vapor outside. 8, vacuum pump vibration generated when the work process and environment influence whether, if the process does not permit the pump should be selected without vibration or take anti-vibration measures. 9, vacuum pump prices, operation and maintenance costs. We take into account all the circumstances, in order to finalize the one adapted to your solution: (1) The minimum investment costs. (2) The minimum running costs of production. (3) the first two circumstances which reasonably evenly distributed over the options.