US Patent 11933317 Low-flow fluid delivery system and low-flow device therefor

Low-flow fluid delivery system. The system includes a pump assembly comprising a pump mechanism having an inlet side and an outlet side, wherein the inlet side is configured to fluidly couple to a fluid supply. The system further includes a pressure sensor operably coupled to the outlet side and configured to measure a fluid pressure at the outlet side. An actuator mechanically is coupled to the pump mechanism to drive the pump mechanism. A controller is coupled to the pressure sensor, wherein the controller is configured with a preselected set of fluid pressure set points and one or more preselected sets of fluid flow rates and wherein the controller is further configured to control the actuator to increase a fluid flow rate to a first flow rate in the preselected set of fluid flow rates when the fluid pressure at the outlet side falls to a lower one of corresponding fluid pressure set point in the preselected set of fluid pressure set points. The controller is further configured to control the actuator to reduce the fluid flow rate to a second fluid flow rate in the preselected set of fluid flow rates, when the fluid pressure at the outlet side rises to an upper one of a corresponding fluid pressure set point in the preselected set of fluid pressure set points.