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A regenerative pump which has a controlled output by having movable lateral channel arcuate slots (36, 38) in channel plates (26) which are on opposite sides of a bladed rotor (18). The channel plates (26) are mounted for sliding movement to reduce the effective vortex channel length in a range from

A regenerative pump which has a controlled output by having movable lateral channel arcuate slots (36, 38) in channel plates (26) which are on opposite sides of a bladed rotor (18). The channel plates (26) are mounted for sliding movement to reduce the effective vortex channel length in a range from about 325°to about 40°. This will result in a proportional reduction of pump pressure rise and input power requirements. The position of the channel plates may be varied by a servo system that responds to a desired system output performance such as pressure rise or flow delivery rate.

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A lateral channel regenerative pump comprising: a housing; a shaft extending into said housing having an axis; a rotor secured to said shaft including a ring of rotor blade compartments; intake and discharge ports disposed in an adjacent relationship on opposite sides of a diametral plane that inclu

A lateral channel regenerative pump comprising: a housing; a shaft extending into said housing having an axis; a rotor secured to said shaft including a ring of rotor blade compartments; intake and discharge ports disposed in an adjacent relationship on opposite sides of a diametral plane that includes said shaft axis; a pair of substantially identical channel plates each having a central slot shaped opening having a major axis lying in said diametral plane and a pair of arcuate slotted openings on opposite sides of said major axis, one end of one arcuate opening being at said inlet port and one end of the other arcuate opening being at said discharge port; said channel plates being positioned on said shaft and mounted for sliding movement relative to the housing in a direction parallel to the major axis of said central slot shaped opening; the arcuate slotted openings being aligned with and providing lateral channels on opposite sides of said rotor so that when the central slot shaped opening is at one position on said rotor shaft the arcuate slotted openings are aligned with the path of said blade compartments to provide maximum pump capacity and when the central slot shaped opening is at a different position, the arcuate slotted openings are eccentric relative to the rotor blade compartments to provide a lateral channel of reduced effectiveness and thereby to reduce the pump capacity and input power requirements.