Silencing check valve

消声止回阀 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、关键性能参数

‌项目‌	‌参数/说明‌
‌公称压力‌	PN1.0–6.4MPa（常规PN1.0/1.6MPa）
‌适用温度‌	-20℃~80℃（EPDM橡胶耐温上限120℃）
‌适用介质‌	清水、污水、海水、油品（pH 4~9）；禁用于高粘度或含固体颗粒介质
‌密封标准‌	双向零泄漏（ISO 5208 A级）
‌降噪效果‌	较传统止回阀噪声降低15–25dB（实测工况）

三、主流类型与特点
‌弹簧加载式‌（H41X/HC41X型）：
结构紧凑，立卧两用；弹簧辅助阀瓣快速复位，适用于常规水泵出口防护。
‌蝶式双瓣型‌（HH49X型）：
双阀瓣铰链结构，体积极小（长度仅为旋启式的1/3），通过橡胶缓冲实现无震闭阀。
‌缓闭消声型‌（300X型）：
集成针阀+球阀水力控制，闭阀时间可调（0–60秒），专用于高层建筑水泵系统。
四、典型应用场景
‌建筑给排水‌：
高层建筑水泵出口防倒流，消除停泵水锤（DN≥300需独立支撑架）。
‌工业系统‌：
电厂循环水防逆流；化工管线弱腐蚀介质控制（需不锈钢阀体+氟橡胶密封）。
‌特殊领域‌：
船舶压载水系统；医疗设备（如血液透析机防血液逆流）。
五、选型与安装规范
‌材质选择‌：
常规水质：球墨铸铁阀体+EPDM橡胶阀瓣；
海水/腐蚀介质：不锈钢阀体+氟橡胶涂层。
‌安装要求‌：
‌必须水平安装‌（阀瓣旋转轴水平）；
阀前装过滤器（防杂质卡阻阀瓣）。
‌维护要点‌：
每半年清理阀腔异物，检查橡胶密封龟裂；
弹簧失效需更换强化不锈钢组件。