A method and apparatus for the pressurizing of fluids wherein a rotor is rotated on a shaft and the rotor is provided with an entry for the fluid at center, a pressurizing cavity with vanes, nozzles discharging the fluid forward, a vortex cavity for pressurizing the fluid, and exit means for passing the fluid from the rotor. Usually a casing is provided for collecting the pressurized fluid with an exit for delivery. The pressurizer can be used to pressurize either liquids or gases. The exit means from the rotor may be nozzles directed to discharge the fluid, or they may be other means for reclaiming part of the kinetic energy of the leaving fluid.