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性,综合考虑了可压缩性、魏氏效应、续流条件和球阀力性,建立了直线电机采油泵球阀规律精确微分方程组。