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。

youdao

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。

youdao