| 摘要 |
An apparatus for measuring flow rate, and controlling delivered volume of fluid flow in a fluid conduit, is disclosed including a valve (14) having a fixed aperture disposed in the fluid conduit for selectively opening and closing the aperture between an open position and a closed position. The valve (14) is selectively closed when a predetermined volume has passed through the valve. Differential pressure is measured across the valve, and the differential pressure is accumulated with respect to time to provide a value corresponding to volume of fluid flow passing through the valve when in the open position. A method for measuring flow rate, and controlling delivered volume of fluid flow through a fluid conduit, includes the steps of selectively opening and closing a valve having a fixed aperture disposed in the fluid conduit between an open position and a closed position, measuring a differential pressure between a first pressure on an upstream side of the valve, and a second pressure on a downstream side of the valve, and when the valve is in the open position, accumulating the differential pressure with respect to time to obtain a value corresponding to volume of fluid flow passing through the valve.
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