In a recent thread about pumps I posted that I was experimenting with peristaltic pumps to dispense UV cure encapsulant. We have no moved on to syringe pumps. These devices move a syringe a pre-programmed distance and therefore can dispense an accurate amount of fluid.
The clever bit is coupling it with a double check valve so that pushing the plunger in dispenses and pulling the plunger out fills the syringe from a supply tank.
This sort of thing: http://www.coleparmer.co.uk/catalog/...sp?sku=7490045
And these are the valves: http://www.westgroup.co.uk/subcatpdf/M%20VP%20CHECK.PDF