Abstract: The rectangular gate vacuum valve assembly comprises a gate frame having an inner space defined therein, wherein the gate frame has opposite side walls and opposite top and bottom walls, wherein the gate frame has opposite first and second gates defined in the opposite side walls respectively, wherein the gate frame has first and second holes defined in one of the top and bottoms walls, wherein the first and second holes are spaced from each other, wherein the other of the top and bottoms walls is entirely blocked; a first valve mechanism configured to translate through the first hole in the inner space and/or to rotate in the inner space to selectively open or close the first gate; and a second valve mechanism configured to translate through the second hole in the inner space and/or to rotate in the inner space to selectively open or close the second gate.