Stuck on design

This may be a simple problem that i have not been able to figure out. But i am currently stuck on my design.

I have a push/pull solenoid at the top of a vial of liquid (vial is upside down). My objective is when the solenoid pushes down on the vial that the vial will open for a certain period to allow flow and then close.

Where i am stuck is how do i get the vial to close again? I've considered an airlock type design on the lid (2 doors). I would like to avoid using a spring inside the vial for cost concerns as well as possible contamination. One concern is the vial will only be about 100mm x 14mm so we are working with smaller spaces.

I guess the difficulty is that the vial is replaceable. So where should the re-closing of the vial come from? the vial itself (may be expensive) or in the rest of the mechanism. Any current tech that does something similar would be very helpful.

I have a feeling I may not have explained this properly but hopefully i can get some insight!

submitted by /u/its_uriel
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