center line of the bar
杆件轴线
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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。
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.
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模块上移
模块下移
不移动