I want to build a machine that pumps liquids (roughly density of water) out of an enclosed cannister. The cannister has for one inlet for air at the very top and has an outlet (near the top as well) that feeds a tube down to the bottom of the bottle. Both these in/out-lets are sealed with silicon and the one that allows air in has a one way valve for the air.
The outlet is connected to a manifold with valves that lets me choose when to allow liquid to flow out.
I want to use an air pump to pressurize the cannister and then control the liquid output (on/off, not flow rate) via the manifold valve.
In addition when the manifold is open the air pump will be constantly pumping to replace lost pressure.
I am considering a pump like this which claims to have an air flow rate of 3.5 liters/minute. Does this mean that if I keep the manifold open and pump I air at 3.5 liters/minute it will flow liquid out of the outlet at the same rate? Or is there something i'm not considering that is going to make it flow at a slower rate?
Such things that might be of concern is the the liquid is acting against gravity (not much, it's being pumped up maybe 6 inches to the manifold) as well as the inner diameter of the fittings on the cannister (0.095 inch).
And a diagram of my intended design: https://i.stack.imgur.com/obEqG.png