(under the class definition) Apparatus in which the pump has a mechanical pumping member (e.g., rotor or piston) and an inlet flow line and means being provided to (1) change the flow of the pumped fluid without altering the movement of or direction of rotation of the pumping member, i.e., the inlet flow line under one condition of operation becomes the outlet flow line under the other condition of operation and vice versa or (2) change the direction of rotation of the pumping member or a driving element therefor without reversing the direction of flow of the pump fluid in the flow lines.
SEE OR SEARCH THIS CLASS, SUBCLASS:
239, for similar devices in which the reverse flow with unidirectional drive or the unidirectional flow with reverse drive is effected by a rearrangement of parts or the addition or omission of a part.
291, for a reversibly driven pump with a pressure responsive bypass operable in either flow direction.
