该方程是关于液缸内液体压力、泵阀升程与泵阀运动速度的一阶常微分方程组。

The new model is a first-order ordinary differential equation group for the fluid pressure in the cylinder...

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主要是在玉刚砂混合液中起到搅拌、吸砂的作用，且具有排量大、无飞溅、温升低和泵体球墨铸铁制造等特点。

This series of quartz sand pump are characterized by large displacement, free of splashing , low temperature rising in the process of sand stirring and sucking . The body is made of ductile iron.

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根据上部气举对液面的影响情况提出了气举-电潜泵组合举升的两类设计方法。

Finally, it brings up two different ways of how to design GL-ESP combined lift according to whether has an influence on annular fluid level or not.

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