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The importance of duckbill valves (check valves, non-return plugs)
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Duckbill valves (check valves, non-return plugs) are key components in fluid control systems and are widely used in various precision micro pumps, valves and other equipment. Their core function is to achieve directional fluid flow control through the unidirectional conduction characteristic of the cut seam.
Its performance directly affects three core links:
① Ensure the accuracy of fluid transportation and avoid backflow interference with system pressure stability;
② Maintain the operational efficiency of the equipment and reduce energy consumption losses through stable flow control;
③ Enhance the overall sealing performance of the system to prevent medium waste or equipment damage caused by leakage. Therefore, the quality of the duckbill valve is crucial to the stability, reliability and service life of fluid equipment, and it is a core guarantee component in the field of precision fluid control.
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Common problems with duckbill valves
In the practical application of duckbill valves, four key issues that directly affect their functions and performance are prone to occur
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Cutting seam adhesion problem: The cutting seam adheres, making it impossible to open normally. This directly leads to the failure of the one-way conduction function, preventing the fluid from passing through or causing the reverse flow control to fail, resulting in system shutdown or operational failure.
Uneven cutting seam issue: Differences in cutting seam size, depth or Angle lead to inconsistent fluid passage rates for different products, causing flow deviations and affecting the precise control of fluid delivery volume by the system.
Crack problem at the cut seam: Cracks or damages at the cut seam not only cause abnormal fluctuations in flow rate, but in severe cases, it can also completely lose the one-way check function, leading to medium leakage or equipment pressure imbalance.
The problem of the cut seam not fitting tightly: When the cut seam is closed, there is a gap, which cannot achieve a complete seal, causing backflow leakage of the fluid, disrupting the directional transportation logic of the system, and even contaminating the medium or damaging downstream components.
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The causes of the problem
The root causes of the four types of problems can be analyzed from three dimensions: material selection, design process and production management
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The reasons for the adhesion of the cutting seam: First, the material formula is inappropriate. The selected material itself has strong self-adhesiveness or insufficient anti-aging performance. The second reason is that no anti-sticking treatment was carried out after the cutting seam processing, resulting in natural adhesion of the contact surface of the cutting seam during storage or use.
The reasons for uneven cutting: mainly due to the unreasonable design of the cutting tool, such as insufficient tool accuracy and deviation of the cutting path; Meanwhile, during the production process, there was a lack of effective inspection procedures, and products with dimensional deviations could not be screened out in time, resulting in substandard products flowing downstream.
The reasons for the cracking of the cut seam: On the one hand, there are defects in the material formula, and the tear resistance and toughness of the material are insufficient; On the other hand, improper structural design, such as stress concentration at the cutting seam position and unreasonable thickness distribution, leads to cracking easily when subjected to force.
The reason for the poor fit of the cut seam: The core issue is that the dimensional tolerance of the duckbill valve is not strictly controlled, and the fit accuracy with the matching assembly parts is insufficient. This leads to interference or gap at the cut seam after assembly, making it impossible to close tightly and ultimately causing backflow leakage.
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DOIT's solution
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DOIT produces over 60 million pieces of duckbill valves annually. The application fields include various precision micro pumps and valves. We develop together with our customers, select the appropriate material formula for them, design the suitable mold structure, and implement strict manufacturing process control. Therefore, we can continuously provide customers with stable-quality products.
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DOIT has 15 years of rich experience in rubber precision design and has successfully solved all the above problems.
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