US Patent 11702906 Density constant flow device using a changing overlap distance

Provided, in one aspect, is a fluid flow device. The fluid flow device, in one aspect, includes a housing having at least one fluid inlet and at least one fluid outlet, and a sleeve positioned within the housing. The fluid flow device according to this aspect additionally include a fluid flow member positioned within the sleeve, wherein the sleeve and fluid flow member are movable with respect to one another to define a first overlap distance and a first fluid flow path length when the housing encounters a first fluid flow pressure, and a second greater overlap distance and a second greater fluid flow path length when the housing encounters a second greater fluid flow pressure, the first fluid flow path length and the second greater fluid flow path length configured to provide a constant flow of the fluid out of the at least one fluid outlet.