Regulated Switching

Regulated Switching
How to make a homemade switch?

I am making a fire extinguisher for science and I have 2 storage containers of Vinegar and Baking Soda. There is one compartment where they will meet and build up pressure and then finally be released. I need a switch that will stop and help me regulate the flow from the storage tanks to the mixing one.

Can anyone find a good switch method?
E.g Using like flaps to open them up that are atatched to sticks.

You could use simple ball valves if this is just for a class. The only thing is that they are expensive if you want anything bigger than a nominal size. A Butterfly Valve could also work.

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