Silencing check valve

消聲止回閥 is a special check valve designed to prevent medium backflow and reduce fluid noise, combining fluid control and acoustic optimization design, suitable for water supply and drainage, HVAC, and industrial pipeline systems. Its core features and technical points are as follows:

1、 Core Structure and Noise Reduction Principle
Streamlined design of valve body:
The inner wall of the valve chamber has an approximately ellipsoidal structure, reducing fluid sharp bends and turbulence, lowering resistance and flow erosion noise.
Full diameter flow channel (DN40-DN1600) avoids impurity deposition and reduces local vortex generation.
Closed valve buffering technology:
Spring loaded valve disc: valve disc composite rubber sealing layer (EPDM/NBR), spring assisted rapid closure and reduction of water hammer impact (closing time shortened by 40%).
Slow closing structure (such as 300X type): The main valve is closed in stages through hydraulic control (first quickly closed and then slowly closed), completely eliminating water hammer caused by pump shutdown.
Guided noise reduction mechanism:
The valve disc adopts a central axis dual end guide (such as HC42X type) to limit rotational vibration and ensure smooth opening and closing without noise.

二、關鍵性能參數

‌項目‌	‌參數/說明‌
‌公稱壓力‌	PN1.0–6.4MPa（常規PN1.0/1.6MPa）
‌適用溫度‌	-20℃~80℃（EPDM橡膠耐溫上限120℃）
‌適用介質‌	清水、污水、海水、油品（pH 4~9）；禁用于高粘度或含固體顆粒介質
‌密封標準‌	雙向零泄漏（ISO 5208 A級）
‌降噪效果‌	較傳統止回閥噪聲降低15–25dB（實測工況）

三、主流類型與特點
‌彈簧加載式‌（H41X/HC41X型）：
結構緊湊，立臥兩用；彈簧輔助閥瓣快速復位，適用于常規水泵出口防護。
‌蝶式雙瓣型‌（HH49X型）：
雙閥瓣鉸鏈結構，體積極小（長度僅為旋啟式的1/3），通過橡膠緩沖實現無震閉閥。
‌緩閉消聲型‌（300X型）：
集成針閥+球閥水力控制，閉閥時間可調（0–60秒），專用于高層建筑水泵系統。
四、典型應用場景
‌建筑給排水‌：
高層建筑水泵出口防倒流，消除停泵水錘（DN≥300需獨立支撐架）。
‌工業系統‌：
電廠循環水防逆流；化工管線弱腐蝕介質控制（需不銹鋼閥體+氟橡膠密封）。
‌特殊領域‌：
船舶壓載水系統；醫療設備（如血液透析機防血液逆流）。
五、選型與安裝規范
‌材質選擇‌：
常規水質：球墨鑄鐵閥體+EPDM橡膠閥瓣；
海水/腐蝕介質：不銹鋼閥體+氟橡膠涂層。
‌安裝要求‌：
‌必須水平安裝‌（閥瓣旋轉軸水平）；
閥前裝過濾器（防雜質卡阻閥瓣）。
‌維護要點‌：
每半年清理閥腔異物，檢查橡膠密封龜裂；
彈簧失效需更換強化不銹鋼組件。