The landing collar comprises housing, ball seat and latch.
由外壳、锁紧座和球座等组成。
The internal components of the landing collar are generally fabricated from plastics, cement and other drillable materials.
坐放箍的内部部件一般由塑料、水泥和其它可钻材料制成。
A diaphragm in the plug body ruptures to allow the cement slurry to pass through after the plug reaches the landing collar.
在塞体中的隔膜破裂，以便使水泥浆能在底塞到达止塞箍以后通过。
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