Three O-ring seals on the stem to ensure sealing performance more effectively.

阀杆密封采用三道“O”型圈，使密封性能得到更有效地保障。

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Start stem O-ring seal over stem, then press into position as handle is pressed down over stem.

从阀杆上的阀杆O形环密封开始，然后在手柄安装在阀杆上后，将其压进手柄的位置上。

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The main valve by valve, O-rings, lock, stem, frame, (hand wheel) pneumatic devices composed pieces.

本阀主要由阀体、O型圈、闸板、阀杆、支架、（手轮）气动装置等件组成。

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