压差放大式逆止阀的研制及工程应用

输引水工程线路长，沿线地下水位复杂多变，防渗结构存在抗浮稳定问题，一般采用排水减压措施进行处理，具有单向排水功能的逆止阀是最为可行的选择，但现有逆止阀产品仍存在安装方向要求严、施工精度要求高、启闭不灵活、长期性能差等不足。针对以上问题，结合逆止阀应用条件，从启闭原理、止水方式和防淤堵等方面入手，研发了压差放大式的新型逆止阀;逆止阀的开启和关闭只通过压差控制，无需任何外力，无方向性要求;采用了压差放大式结构和弧形接触止水方式，提高了启闭的灵敏性和可靠性;设计了专门的防淤堵结构并考虑了产品的疲劳破坏问题，保障了产品的长期性能。逆止阀可作为渠道、堤防和河道的护坡、大坝水位波动区、输水隧洞、航闸底板及其他涉水建筑物等工程防渗结构的排水减压措施。

Development and Engineering Application of Reverse Check Valve Based on Differential Pressure Amplification

Drainage system and pressure reduction measures are usually adopted to treat the uplift of anti-seepage structure of water transfer project caused by long route and varying groundwater table.Check valve-drainage system in which reverse check valve plays a key role nakes one of the best choice for its one-way flow performance.Existing reverse check valves have an inflexible opening and shutoff process,a poor long term performance,a meticulous construction operation,and must be accurately installed in a certain direction.To solve these problems,a novel reverse check valve based on differential pressure amplification is researched and developed in consideration of application conditions.The principle of opening and shutoff is improved;and new shutoff type and anti-clogging method are put forward.Opening and shutoff of the new check valve is only driven by amplified differential water pressure,and no other external force is needed,thus,it can be installed in every direction.Differential pressure amplification components and arc close structure are developed to improve the reliability and flexibility of opening and shutoff.Anti-clogging structure is designed and anti-fatigue problem is considered to ensure the long-term performance.The new reverse check valve can be widely used in the drainage system of canal,slope protection of dike and river course,groundwater table change belt of dam,water conveyance tunnel and other water-involving structures.