NOVELTY - A microvalve assembly comprises a stationary microvalve body containing a polymer, elastomer or rubber and an aperture (72) between a first and second surface; and a movable microactuator connected to the apertures. The microactuator is capable of moving between a first position where fluid cannot pass through the aperture and a second position that allows fluid to pass through apertures.    USE - For an electrochemical cell (claimed) such as fuel cell for controlling rate of flow of fluids e.g. gas to power electronic devices.    ADVANTAGE - The microvalve assembly is relatively inexpensive; straightforward to produce; is relatively small in size; and takes up little volume in cell in which the microvalve assembly is incorporated, thereby maximizing volume for energy producing components. The assembly allows high rate discharge of the cell with relatively low or evens no capacity loss during periods of low rate or no discharge. The assembly has a complex configuration and is efficiently and economically produced at high speeds, preferably utilizing a printing process during at least one step utilized to form microvalve assembly. The fluid regulating microvalve assembly selectively supplies fluid in sufficient amounts from exterior of the cell so that the cell can discharge at a high rate or power level, and also minimizes or prevents the fluid from entering the interior of the cell when the cell is not being discharged or being discharged at an extremely low rate.    DETAILED DESCRIPTION - The body includes a substrate (62) and an insulating layer (66, 68, 70) printed on at least a portion of the substrate.    An INDEPENDENT CLAIM is included for preparing the microvalve assembly involving forming microvalve body and microactuator; and operatively joining the microvalve body to the microactuator.    DESCRIPTION OF DRAWING(S) - The figure shows a cross sectional view of the microvalve assembly.    substrate (62)    insulating layer (66, 68, 70)    apertures (72)    sublayer (86)    projection (90)    cavity. (92)