FIG. 6.

Valve operation and evaluation. (a) Operation of a 2 mm diameter valve membrane where the control pressure (red triangles) is the external pressure supplied to deflect the membrane and close the valve, fluid pressure (blue circles) is the pressure that builds up in the inlet channel as the syringe pump pushes fluid into the device, and fluid velocity (green solid line) is the volumetric flow rate at the valve outlet. (b) Fluid pressure at which the valve opens as a function of applied control pressure for a 3 mm valve, before and after 400 actuations and after 800 total valve actuations.