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Mar 17, 2022 · Duckbill check valves are non-mechanical, require no maintenance, and do not slam when closed. They are also resistant to organic contaminants such as algae and barnacles and have no problem disposing of suspended solids entrained streams, such as abrasive slurries.
Mar 7, 2024 · Conversely, when the flow ceases or reverses, the slit naturally closes, forming a seal to prevent backflow. This inherent flexibility and self-sealing mechanism make duckbill check valves highly efficient and reliable in controlling fluid movement. Why Do We Need Duckbill Check Valves?
Check Valve Slam. Check valve slam occurs after pump stoppage when the system flow reverses back towards the pump before the check valve is fully closed (Figure 1). The reverse flow causes the check valve to close rapidly through the remaining portion of its travel.
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Cla-Val Rubber-Flex Duckbill Check Valves are designed to provide outstanding back-flow prevention; eliminating costly and unwanted back-flow from rivers, oceans, storm water, and is an excellent choice for sewage diffuser systems.
Every pump station designer has witnessed check valve slam, which is caused by the sudden stoppage of reverse flow through a closing check valve. To prevent slam, an automatic check valve must either close very quickly or close slowly by using oil dashpot devices. FIGURE 1.
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Surprisingly, a resilient-seated check valve can make the same metallic slam sound as a metal-seated valve. To prevent slam, a check valve must either be able to close in a frac-tion of a second or be fitted with oil dashpot devices or actuators to con-trol its closure over several seconds or (depending on the length of the pip-ing system) minutes.
May 1, 2024 · When compared to conventional check valves, duckbill valves offer several distinct advantages: Enhanced Durability Built to withstand corrosive and abrasive conditions, they outlast many traditional check valves, reducing long-term replacement costs.
