How No Drip Valve Helps Improve User Experience in Compact Designs

https://nbrvalvenotebook.iamarrows.com/why-silicone-valve-seal-quality-matters-in-food-and-beverage-closures

Designing a small part can affect the whole product. A no drip valve may look simple, but it has a real job to do. It must work with the cap, case, fluid, air path, or light path around it