Adding air pressure within the annular space between the housing and sleeve can throttle, or close the valve.
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。
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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