It is suited to control media by being full opened or closed in pipelines and devices. Its disc is driven by stem, which lift along the seat axis.
本产品适用于全开全闭的各类管道及设备上的启闭件，由阀杆带动，沿阀座轴线作升降运动的阀门。
2
It is found that the Angle between tumble axis and horizontal plane increases with valve lift. The "tumble" is not a pure tumble, but is a inclined swirl.
用热线风速仪研究了缸内滚流的形成过程，发现滚流轴线与水平面的夹角随气门升程的增大而增大。
3
Then kinematics and dynamics of lift-drag-type vertical axis wind turbine of living leaves is analyzed and mathematical model is established.