Short answer:The key factors in selecting a silicone duckbill valve are not its physical dimensions, but rather the medium, opening pressure, reverse pressure differential, flow rate, and cycle life. During design, the lip thickness, cut consistency, and installation preload must all be controlled simultaneously to ensure both low-pressure opening and reliable check valve function.
In what kinds of situations are these silicone parts suitable?
Clearly defining the actual application scenarios helps translate material, structural, and validation requirements into actionable technical specifications.
- Unidirectional Control of the Pump Housing, Fluid Storage System, and Drainage Structure
- Backflow Prevention for Medical Supplies, Home Appliance Water Lines, and Cleaning Equipment
- Powder and Liquid Discharge, Air Line Pressure Relief, and Dust- and Insect-Proof Structures
Parameters to Confirm Before Selecting a Model
We recommend providing the following information before requesting a quote or ordering a sample to minimize the need for repeated prototyping and misunderstandings regarding specifications.
- Specify whether the medium is a liquid, gas, or contains particles, as well as the temperature range.
- Specify the target opening pressure, allowable backflow rate, and maximum reverse pressure.
- Confirm Requirements for Food, Medical, or Drinking Water Contact Information
Key Points in Structural Design
Structural dimensions, assembly relationships, and material elasticity must be evaluated together; simply increasing a single parameter generally does not directly improve reliability.
- If the lip opening is too thick, it will increase the opening pressure; if it is too thin, it may not close securely.
- When drilling mounting holes, take care to avoid applying pressure to the valve body that could cause deformation of the cutout.
- Flow channel bends and outlet clearances should not obstruct the opening of the valve lip.
Production and Quality Control
Consistency in mass production results from the combined control of material batches, mold condition, molding windows, and inspection methods.
- The location and depth of the cut, as well as burrs, should be considered key inspection items.
- For multi-cavity molds, the opening pressure and flow rate of each cavity must be compared.
- Avoid subjecting the valve nozzle to prolonged pressure or folding during packaging.
Recommended Verification Items
Validation should be conducted using actual or equivalent operating conditions whenever possible, and functionality should be reconfirmed after aging or cycling.
- Measuring the Forward Opening Pressure-Flow Curve
- Test reverse pressure hold, leakage rate, and repeated opening and closing
- Conduct medium immersion, temperature cycling, and post-lifetime retesting
Frequently Asked Questions
Is it better for a duckbill valve to have a lower opening pressure?
No. Setting it too low may cause it to open accidentally during transport or vibration, and may also compromise the reverse sealing capability.
Can it be replicated directly based on the existing sample?
This can be used for a preliminary evaluation, but verification is still required using actual media, pressure differentials, and installation configurations.
How do I provide information to suppliers?
Please provide 2D or 3D drawings, photos of samples, material and hardness specifications, operating environment, target quantity, acceptance criteria, and a list of compliance documents. Based on this information, Chengxin Silicone Rubber can evaluate the materials, molds, molding process, and validation plan.