The structure consists of four parts : shell, whole seal assembly, hanger assembly, self seal rubber core assembly.
其结构由壳体、全封总成、悬挂器总成、自封胶芯总成四部分构成。
Close the annular blowout preventer as the well pressure is relatively low and force oil pipes and couplings to pass through rubber core of the annular blowout preventer.
井压较低时，关闭环型防喷器，使油管和接箍强行通过环型防喷器胶芯。
Close the annular blowout preventer as the well pressure is relatively low and force oil pipes and couplings to pass through rubber core of the annular blowout preventer.
井压较低时，关闭环型防喷器，使油管和接箍强行通过环型防喷器胶芯。
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