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,根据机采油泵运动特性,综合考虑了液体可压缩性、魏氏效应、液体连续流动条件阀动力特性,建立了机采油泵阀运动规律精确运动微分方程组。