Practical Design Guide for Silicone Valve Seal in Modern Product Development

https://rubbervalvelab.theglensecret.com/how-an-air-breathing-valve-helps-packaging-and-devices-manage-airflow

Many product issues start with a small detail that was not checked early. The silicone valve seal is one of those parts that needs close care. A good part should fit well and act in a stable way