螺纹旋进式阀盖：通常用于轻型管道系统和小尺寸青铜多回转阀门中。

Threaded-in bonnet is common in lighter-duty services and smaller sizes of bronze multi-turn valves.

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阀杆结构1） 明杆-内螺纹结构对于青铜多回转阀门来说是最通用、首选的结构形式。

Stem structure 1) stem - inside screw bronze multi-turn valves for the most common and preferred structure.

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