Pressure in duckbill valve includes cracking pressure & back pressure. The small duckbill valve cracking pressure usually is between 0-5Kpa(0-0.71psi). In some situation, you could add cracking pressure by design, such as increase the thickness of product, cross type of lip. Although it is not the best option with high cracking pressure by duckbill valve. If you want to learn more contact us.

Cross Duckbill Valve to add cracking pressure

Slit Cutting

The back pressure provide capability of prevention of backflow. It depends on duckbill’s slit, and the valve’s structure. So based on different condition, the back pressure range could be 100Kpa-500Kpa(14.3psi-71.4psi)

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