在许多情形中，在预定压力下利用坐放在定型座上的落球使坐封机构或启动机构移位。
In many cases a drop ball, which lands in a profiled seat, will be used to shift the setting or activation mechanism at predetermined pressures.
Y341 114型自验封封隔器采用了坐封机构和验封机构一体化设计，实现了封隔器坐封与验封同步完成；
Y341-114 self-sealing examination packer adopts integral design of setting and self-sealing examination mechanism, which achieves the simultaneous completion of setting and self-sealing examination.
坐封部分和锁紧部分采用液缸推进和卡簧步进锁紧机构；
The hydraulic cylinder propulsion and circlip stepping locking mechanism is used in the setting part and locking part.
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