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。
Applying air pressure to the annular space between the sleeve and the body actuates the valve.
在套管与阀体之间的环形空间内施加气压来驱动阀门。
Applying air pressure to the annular space between the sleeve and the body actuates the valve.
在套管与阀体之间的环形空间内施加气压来驱动阀门。
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