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.
真空挡板阀是通过电磁换向阀改变气路方向，控制执行气缸驱动阀门作启闭运动。
GDQ pneumatic high vacuum flapper valve USES solenoid directional valve to change the direction of air passage, and controls the actuating cylinder to drive the valve opened and closed.
型夹管阀也是所有执行机构驱动阀门中成本最低的选项，这有助于最大限度降低成本。
The Type a is also the lowest cost actuated valve available, which helps the bottom line.
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