A method, system and apparatus that may be used for transferring a fluid such as molten metal, pure water, chemical liquid, and the like are disclosed. None of the functional mechanical parts or elements such as mechanical valves that require the mechanical motions, i.e., rotary, sliding, or other like motions are not included, and the fluid transferring and/or branching functions are instead implemented.
The fluid transfer apparatus includes a fluid storing chamber, an air inlet/outlet means connected to the upper end of the fluid storing chamber, an inlet pipe having its open upper end connected to one lateral wall of the fluid storing chamber and having its open bottom end extending into the fluid being transferred through which the fluid is drawn into the fluid storing chamber by decreasing the pressure in the fluid storing chamber, and a U-shape outlet pipe through which the drawn fluid in the fluid storing chamber is transferred by increasing the pressure in the fluid storing chamber, wherein a part of the drawn fluid is allowed to remain in the U-shape outlet pipe when the pressure in the fluid storing chamber is decreased, and the other hand a part of the drawn fluid is further allowed to remain in the bottom end of the inlet pipe when the pressure in the fluid storing chamber is increased.