First, determine the type of booster pump according to the pressurizing medium. For example, the supercharging medium is air / nitrogen, we choose in the air / nitrogen supercharger; the turbocharger is the gas, we choose it in the gas supercharger; the supercharging medium is the liquid, and we choose it in the pneumatic liquid supercharger pump.

第二，根据系统所需压力初步确定泵的型号。一般地，SC的气动增压泵的驱动气压≤7bar。所以，增压比Ratio=Po/Pa。其中，Po是系统的输出压力；Pa是气动泵的驱动压力，一般取较大值0.7MPa。根据计算出来的增压比，在相应类型的泵表中选择型号。注意，通常我们会选择增压比略高于计算值的泵，以确保我们的泵在通常情况下都能输出系统所需压力。

Second, initially determine the type of pump according to the pressure required by the system. Generally, the driving pressure of the SC pneumatic booster pump is less than 7bar. So, the turbocharging is more than Ratio=Po/Pa. Among them, Po is the output pressure of the system; Pa is the driving pressure of the pneumatic pump, and generally takes the maximum value of 0.7MPa. According to the calculated supercharging ratio, the model is selected in the corresponding pump table. Note that we usually choose a pump with a supercharged ratio slightly higher than the calculated value to ensure that our pump normally outputs the pressure required by the system.

第三，核算泵的流量是否满足系统要求。当我们根据泵的出口压力初步选择了泵的型号后，我们需要核算改泵的流量是否满足要求。泵的流量计算方法是这样的：每冲程的排量×每分钟的动作频率（一般以40计）。比如，气动液体增压泵10-4000W003，我们在泵表中查到它每冲程的排量是42.50ml，那么它的流量Q=q×n=42.50ml×40=1700ml/min=1.7L/min。将这个流量与系统需要的流量比较，看是否满足要求。

Third, check whether the pump flow meets the system requirements. When we initially select the type of pump according to the outlet pressure of the pump, we need to check whether the flow rate of the pump is satisfied. The calculation method of pump flow is this: the displacement frequency per minute is 40 times per minute. For example, the pneumatic liquid booster pump 10-4000W003, we find in the pump table that it is 42.50ml per stroke, then its flow is Q=q * n=42.50ml * 40=1700ml/min=1.7L/min. Compare the flow with the flow of the system to see if it meets the requirements.

如果流量不够，那么，我们再选择一个增压比相近，流量比较大的泵，并核算流量，直到满足系统流量要求为止。注意，我们所说的流量都是指常压下的流量，即将1分钟内经过泵增压的介质（液体或气体）放在常压下去测量它的体积。所以，对于气体，我们需要考虑预增气压的大小。比如，我们用空气增压器AB-2将7bar的空气增压1.2MPa，那么它的流量Q= 7×q×n=7×47.6ml×40=13328ml/min=13.328L/min。

If the flow is not enough, then we choose a pump with a supercharged ratio and a relatively large flow rate, and calculate the flow until the system flow requirements are met. Note that the flow we say refers to the flow under normal pressure, and the volume of the medium (liquid or gas) which is pressurized by the pump (liquid or gas) will be measured in the atmospheric pressure in 1 minutes. So for gas, we need to consider the magnitude of the pre pressure. For example, we use air booster AB-2 to pressurized 7bar air to 1.2MPa, and its flow rate is Q= 7 x Q x n=7 * 47.6ml * 40=13328ml/min=13.328L/min.

第四，根据增压介质选择泵的材质。经过上面3个步骤后，我们可以选出泵的基本型号了。然而，正确的型号还得考虑增压介质对增压泵材质的要求。一般的，我们选择铜合金就可以了；如果增压介质对材质要求较高，比如水，我们选择不锈钢。

Fourth, select the material of the pump according to the supercharging medium. After the above 3 steps, we can select the basic type of the pump. However, the correct model must also consider the requirements of the pressurizing medium for the material of the booster pump. Generally speaking, we choose copper alloy. If the pressurizing medium requires higher material quality, such as water, we choose stainless steel.