A proposed reciprocating pump would operate at a small stroke and would contain no sliding parts. The oscillatory motion of a piston in the pump could be provided by a magnetostrictive actuator, for example.
To compensate for its small stroke, the pump would have to operate at a high frequency at which most check valves do not work well and at which the pump would be sensitive to trapped air if its piston area were small. Valve efficiency could be increased by use of flapper valves or nozzles. Effective piston area could be increased, without increasing the diameter of the pump, by use of multiple pistons or a helical piston.
This work was done by Arnon Rieger, Michael J. Gerver, Ralph C. Fenn and Dariusz Bushko of Satcon Technology Corp. for Johnson Space Center. No further documentation is available. MSC-22462