The ejector plate assembly's movement effectively withdraws the central mandrel from the collapsible sleeve, thereby causing it to contract in diameter.
2
在阀体外壳和套管之间的环形空间内施加气压，即可实现阀门的节流和关闭功能。
Adding air pressure within the annular space between the housing and sleeve can throttle, or close the valve.
3
水泥只在套管或井眼环形空间的某一面的通道内流动的现象，因而不能在所有的径向上提供充分的水力隔离层。
The condition in which cement flows in a channel only on some sides of the casing or borehole annulus, and thus does not provide adequate hydraulic isolation in all radial azimuths.
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