ball valve

1.NIB-SEAL on sweat ball valves are shipped unassembled.

在焊接球阀上，NIB-SEAL在装运时处于未组装状态。

2.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,根据直线油泵运动特,综合虑了液体的可压缩、效应、液体连续流动条件和球阀的动力特,建立了直线油泵球阀运动规律的精确运动微分方程组。