condensability

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,综合考虑了液体的压缩、魏氏效应、液体连流动条件和球阀的动力特,建立了直线电机采油泵球阀运动规律的精确运动微方程组。