当单作用气缸17的杆促动引导阀，主机开始在启动空气的作用下运转。

No. 17 actuates the pilot valve, the main engine begins to run on the starting air.

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阀瓣打开后，压杆在弹簧作用下旋转一定角度支住阀瓣，使其不能关闭。

When the disc is opened, with the springs at work, the strut rotates to an Angle so as to prop up the disc and keep it from closing.

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弹赞定位销可保证蝶板不会因为蝶板重力作用下坠，还可在下阀杆端部设置调整块来保证蝶板位置固定。

Play great positioning pin ensures disc not because butterfly plate gravity drop, also can be installed in the valve stem end adjustment block to ensure that the butterfly plate fixed position.

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