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特性,综合考虑了液体的可压缩性、魏氏效应、液体连流条件和球阀的力特性,建立了直线电机采油泵球阀运规律的精确运微分方程组。