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、液体连流动条件和球阀动力特性,建立了直采油泵球阀运动精确运动微分方程组。