Unverified85% confidenceFactTime unknown
市面主流止逆阀分三种结构:单层挡板式(阻力小密封差)、双层翻板式(平衡型最常用)、球形/浮球式(多用于地漏排水防返),厨房烟道选双层翻板式为主
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85%
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Long-term
Relevance
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