Servo Valve Plastic valve

This is a modified version of the ordinal servo valve. The main design changes are in order to accommodate the new and cheaper plastic valve which cost me about 4$ for about 200 valves. I used this design on one of my projects œIntravenous Infusion System. A link with working attached below..
http://www.youtube.com/watch?v=CsNpG-C3WaY