Practical Design Guide for Liquid Dispensing Valve in Modern Product Development
https://valveinnovationdesk.raidersfanteamshop.com/why-an-oil-resistant-rubber-valve-needs-careful-fit-and-seal-design
Many product issues start with a small detail that was not checked early. The liquid dispensing valve is one of those parts that needs close care. A good part should fit well and act in a stable way