这样做可以保持内鼻阀，避免鼻背美学曲线的中断，预防倒V畸形出现和气道完整性破坏。
This will tend to preserve the internal valve, avoiding disruption of the dorsal aesthetic lines, and inverted V deformity, and airway compromise.
采用倒关双密封设计，可带压更换上密封组件，整体阀盖暗杆设计，结构紧凑。
Use back seal design, can replace top seal parts under pressure. Entirety of non-rising bonnet design, have compact structure.
阀杆与阀盖之间带倒密封结构，便于阀门带压更换阀杆填料。
Valve rod with valve lids between bring fall airproof structure, Convenients for valve bring press replacing valve stem packing.
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