1.Duckbill Valve as a flow control check valve should have rigid sealing with low or high opening pressure demands after slit cutting.
However, in daily life, we face too many problem about duckbill valve:1)Duckbill valve for Breast Milk Pump2)Duckbill valve for Drainage3)Duckbill Valve for Water Bottles Cap2.What's the root cause of duckbill check valve defects?Duckbill Valve Die-cutting Mould Problem:Silicon rubber flashing remain in slit-cutting location will affect duckbill check valve's sealing effects.Issue of Die-cutting mould positioning.Cut silicone rubber materials out of valves.
that will 1ike spraving nozzle and can't prevent backflow function.Small gaps not cutting (knife tooling is blunt or insufficient strength die-cutting)Duckbill Valve Materials Choice and Processing:Rebound Resilience High-tensile elastic silicone and LSR: Raw rubber content of rubber materials will affect check rebound resilience.
Generally, high-tensile strength silicone and liquid silicone LSR is better sealing effect.Silicone Hardness Problems: Different hardness will affect rebound resilience.Vulcanization Problems: Many manufacturers would not like deal with secondary cure process after molded production in aim to save processing cost.
Without additional vulcanization, physical properties of silicone can't achieve desired effects.
and also harmful materials or elements easily remains in silicone duckbill valve.Duckbill Check Valve Design Problem:1)Duck Bill Shaped Angle2)Silicone Duckbill Thickness3)Cutting-place width and thickness.
