离心泵的扬程又称为泵的压头，是指单体重量流体经泵所获得的能量。
Also known as the centrifugal pump lift pump pressure head, the weight of fluid monomer is received by the pump energy.
目前对泵的压头尚不能从理论上作出精确的计算，一般用实验方法测定。
Now the pressure head of the pump is not able to make precise calculations in theory, the general use of experimental methods.
往复泵的实际流量比理论流量小，且随着压头的增高而减小，这是因为漏失所致。
The actual flow reciprocating pump flow rate than theory, and with the increased pressure head decreases, which is due to leakage caused.
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