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.
为了有效解决低压漏失井的井下清砂问题，研究开发了一种具有钻进功能的捞砂泵。
To solve effectively the problem of sand removing in low-pressure absorption Wells, a drilling sand pump was developed.
该模型不仅适用于柱塞与泵筒正常间隙漏失的仿真计算，也适用于非正常间隙严重漏失的计算。
This model is not only adaptable to the calculation of the leakage of the normal clearance, but also to the calculation of the severe leakage of the abnormal clearance.
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