1.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.

1.结现场试验,根据直线电机采油泵运动特,考虑了液体可压缩、魏、液体连续流动条件和球阀动力特,建立了直线电机采油泵球阀运动规律精确运动微分方程组。