Single wheel multi-stage radially-layered regenerative pump

A method of making a regenerative rotary pump assembly, the method comprising:

• providing a housing;
• mounting an elongated shaft in the housing for rotation about a rotational axis, the shaft having a longitudinal axis aligned with the rotational axis;
• connecting a rotary member to the shaft and dimensioned for receipt in the housing, the rotary member having opposite, first and second faces axially spaced from one another in a direction of the longitudinal axis;
• forming a first pump stage having a first stage inlet and a first stage outlet in fluid communication therewith on at least the first face of the rotary member;
• and
• forming a second pump stage having a second stage inlet and a second stage outlet in fluid communication therewith on at least the first face, and configuring the second stage inlet to be in fluid communication with the first stage outlet;
• wherein the first stage outlet and the second stage inlet are disposed in an enlarged cavity at the first face of the rotary member so that fluid exiting the first pump stage transfers through the enlarged cavity along the first face to the second pump stage, and wherein the first stage inlet and the second stage outlet are separated by a land portion of the housing.