要求：压差安全阀必须具有将两个止回阀之间的“区域”压力维持在比供应压力低至少2 PSI的功能。
Requirements: the pressure differential relief valve must operate to maintain the "zone" between the two check valves at least 2 PSI less than the supply pressure.
油在压差驱动下注入亲水砂岩孔隙的过程中，油的运移阻力比水大，因而，油往往沿阻力较低的有限通道运移。
When oil enters the hole of water-wet sandstone driven by pressure difference, oil migrates following a line of less resistance because of the migration force of oil is bigger than that of water.
还给出微泵流量与扩散管长宽比、厚宽比、液体粘度和进出口反压差的定量关系。
Quantitative relations of the pump flow rate versus the ratio of diffuser length to width, the ratio of diffuser thickness to width, fluid viscosity and backpressure were also given.
因而阀流通能力比一般调节阀大且无泄漏，在许用压差范围内可作切断阀用。
Thus the valve control valve flow capacity than the average large and no leakage in the range of allowable pressure shut-off valve can be used.
若密度比、静温比相同或相近时，速度差对总压损失的影响可忽略。
The effect of the velocity difference on total pressure loss may be neglected, if the density and the static temperature difference are equal.
但速度差随密度比、静温比增大而增大时总压损失亦随之增大。
But total pressure loss increases with the increasing of the velocity difference accompanied with the increase of the density and the static temperature ratio.
研究了在井筒模拟实验条件下，原油流量、油水比以及温度与井筒压差的关系。
Under the wellbore simulation's experimental conditions, this paper has studied the relationship between crude oil flow, oil-water ratio, temperature and wellbore pressure difference.
随着压差的增加接触压力相应增加，等壁厚螺杆泵比普通螺杆泵接触压力大；
As the increase of the pressure difference, the contact pressure increases, the contact pressure of iso-wall thickness progressive cavity pump is larger than that of common one.
随着压差的增加接触压力相应增加，等壁厚螺杆泵比普通螺杆泵接触压力大；
As the increase of the pressure difference, the contact pressure increases, the contact pressure of iso-wall thickness progressive cavity pump is larger than that of common one.
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