Reversible unidirectional flow pump with axial frictionally engaged recessed valve plate

摘要

A reversible positive displacement rotary fluid pump comprising a rotor with either dual sliding vanes or a single vane defining pumping cavities of increasing and decreasing volume and having a single non-valved inlet for both directions of rotation, outlet flow being controlled by a valve plate rotatable to one of two positions, as determined by the direction of rotation of the pump.