Irvin Frank Zagar
Engineers at Golden, Denver, CO

4634344, Jan 6, 1987

Aug 3, 1984

6/637572

Irvin F. Zagar - Denver CO
Henry T. Choquette - Wheatridge CO

A. R. Wilfley and Sons, Inc. - Denver CO

F04D 104

416175

A pump of centrifugal type having both an impeller unit and an expeller unit coupled together for effecting frictionless hydraulic seal during operation within an appropriate housing therefor. By providing an expeller unit separate from the impeller unit, the portions of the impeller unit which wear fastest can be replaced as needed without the need for replacing other components as soon. This greatly reduces the cost of maintenance and replacement. Also, rotor vanes and stacked separator discs in a preferred embodiment provide for greatly reduced manufacturing and assembly costs, and yet allow the flexibility of easy replacement of only parts that are severely worn or corroded as needed. Both the method of making and the method of assembly are encompassed by this invention. Furthermore, all of the component elements are preferably rubber covered for maximum protection against abrasion and corrosive action of the liquid being pumped.

4915579, Apr 10, 1990

Aug 15, 1988

7/232626

John D. Whittier - Lakewood CO
G. Michael Wilfley - Castlerock CO
Irvin F. Zagar - Denver CO

A. R. Wilfley & Sons, Inc. - Denver CO

F16J 1516, F16J 1518

4151711

A centrifugal pump of the hydraulic sealing type has a novel and improved sealing apparatus for establishing a hydraulic seal and limiting the flow of liquid from a pump casing into a reservoir or seal housing at one end of the pump casing, and a valve assembly in the seal housing has a valve member normally urged into engagement with the seal housing to isolate liquid in the seal housing from the casing when the pump is not in operation. When the pump is activated and brought up to speed, centrifugal force-responsive pivot members are operative to move the valve member away from sealed engagement with the seal housing to establish fluid communication between the seal housing and pump casing. The force-responsive pivot members are fully enclosed so as to be completely isolated from the liquid in the seal housing and yet be capable of operating directly in opposition to the resilient or spring-loaded valve to move the valve away from sealed engagement with the seal housing. An expeller ring at one end of the seal housing limits liquid flow into the seal housing when the pump is stopped and removes any liquid in the reservoir into the pump casing when the pump is started.