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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 · When fluid pressure exceeds a certain threshold in the desired direction, it forces the slit of the valve open, allowing unimpeded flow. This process occurs seamlessly without external intervention, making duckbill check valves inherently passive and low-maintenance components.
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.
May 1, 2024 · Self-Cleaning Capability. The valve’s unique closing motion naturally dislodges debris, reducing the risk of clogging and ensuring it stays clear and functional. Clog-Free Operation. Its flexibility allows solids to pass through effortlessly, minimizing blockages even in challenging flow conditions. Minimal Maintenance.
Oct 29, 2019 · When a pump stops, gravity and reverse flow slam the check valve shut. Because fluid is non-compressible, it creates a pressure or shock wave (water hammer). The fluid continues to flow back and forth until friction losses cause the wave to settle.
surges caused by sudden closure. 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.
