Slider crank mechanism converts oscillation of orange conrod to reciprocatory translation of pink piston. Hand force is applied to the conrod.<br />Disk valves open and shut mechanically because of fluid pressure alteration within the house underneath the piston. once the piston moves up, the lower valve opens, the higher valve closes. the surface liquid is sucked into the house below the piston. The liquid on top of the piston is pushed up and flows outside. once piston moves down, the lower valve closes, the higher valve opens. The liquid is ironed from the house below the piston into the house on top of the piston.
