The condensability of liquid,the Westphal's effect and the continuous flow condition are not only comprehensively considered,but also the dynamic property of the ball valve being established.

结合现场试验,根据直线电机采油泵运动特,综合液体可压、氏效应、液体连续流动条件和球阀动力特,建立直线电机采油泵球阀运动规律精确运动微分方程组。