Work Surfaces (SEFA 3) and Fixtures (SEFA 7).
工作台面（SEFA3）和固属物/配件（SEFA7）。
Xuan Sefa has the advantage of being simple, small space, has been installed, rotary hoist only 90 degrees.
旋塞阀的优点在于结构简单，占用空间小，已安装，启闭只需旋转90度。
Straight-through processing Xuan Sefa mainly used to do cut off, three-and four-way-to medium allocated for the distribution of traffic.
直通式旋塞阀主要做切断用，三通式和四通式用于分配用于分配介质流量。
Xuan Sefa a cone-shaped pieces of the hoist and around the center line perpendicular to the axis of rotation pipeline, completed the hoist valve action.
的启闭件呈锥形，并绕垂直于管道中心线的轴线旋转，完成阀门的启闭动作。
Xuan Sefa a cone-shaped pieces of the hoist and around the center line perpendicular to the axis of rotation pipeline, completed the hoist valve action.
的启闭件呈锥形，并绕垂直于管道中心线的轴线旋转，完成阀门的启闭动作。
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