High temperature flue gas butterfly valve

高溫煙氣蝶閥is an industrial control valve designed specifically for high-temperature dusty gases, mainly used in flue gas treatment systems in industries such as metallurgy, power, and chemical. Its core features are as follows:

1、 Structural Design and Core Features
High temperature resistant structure
Main material: The valve body is made of carbon steel welding or steel plate rolling, lined with refractory concrete or hard alloy layer (such as tungsten chromium cobalt alloy), ensuring stability at high temperatures of 950 ℃~1200 ℃.
Insulation scheme:
Split type insulation chamber design, with hot steam introduced to prevent smoke crystallization and blockage in the valve stem area;
Extended bracket+asbestos insulation layer blocks heat conduction and protects the actuator.
Sealing technology
Dynamic compensation sealing: The elastic metal sealing ring (such as a T-shaped soft ring+stainless steel plate combination) automatically compensates for wear through spring pre tension, achieving bidirectional zero leakage (leakage rate ≤ 0.1%);
Double sealing system: metal hard sealing is the main component, supplemented by flexible graphite packing as a secondary insurance.
Anti jamming design
When the valve plate comes into contact with the valve port, the cleaning rubber can retract into the inner groove to avoid jamming (Jianuo patent solution);
The upper/lower valve stem separation structure reduces deformation and blockage caused by thermal expansion.
2、 Key technical parameters
Scope of parameter indicators applicable scenarios
Nominal diameter DN50~DN4000 small pipeline to large flue
Temperature range -30 ℃~1200 ℃ Dust containing flue gas and high-temperature coal gas
Medium and low pressure pipeline system with nominal pressure ranging from 0.05MPa to 2.5MPa
Leakage rate ≤ 0.5% (soft seal) Environmental strict control scenario
Drive mode: electric/pneumatic/hydraulic automation control

三、行業應用與選型建議
‌冶金行業‌：高爐煤氣回收系統，需耐粉塵沖刷的堆焊合金蝶板‌；
‌電力行業‌：脫硫脫硝管道，優選三偏心結構閥門（如BD943W型）確保雙向密封‌；
‌極端工況‌：
1000℃以上超高溫：采用水冷閥體（循環水降溫）或310S特種合金閥桿‌；
高顆粒物介質：閥板表面噴涂碳化鎢涂層（硬度HRC62+）‌。
四、高溫煙氣蝶閥維護要點
‌安裝規范‌：必須水平安裝，介質流向與閥體標識一致‌；
‌定期檢查‌：密封圈彈性狀態、閥桿結晶物清理，防止啟閉失效‌。

高溫煙氣蝶閥通過材料創新與結構優化，解決了傳統閥門在高溫、含塵工況下的密封失效與卡滯問題‌，是工業煙氣管理的核心設備之一。