Robbins & Myers, Inc.

John A Millington

Alan G Wild

A progressing cavity pump comprises an inlet housing defining a chamber, an extension tube defining a tube interior communicating with the chamber, a stator defining an internal passageway communicating with the tube interior, a rotor positioned in the internal passageway in abutment against an inner surface of the internal passageway and a coupling at least partially enclosed by the extension tube. The coupling is connected to the rotor for actuating the rotor for rolling movement along the inner surface of the internal passageway of the stator. In an especially preferred form, the extension tube is in the form of a surface of revolution and is separable into first and second sections along a dividing plane which passes through the center of the tube. Fasteners are used to removably fasten the first and second sections to each other, the housing and the stator casing to provide access for inspection of the coupling, the rotor and the stator.

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Portland, ME, United States of America

John A Millington