Fred L Laqua

US Patent:

D385678, Jun 12, 1990

Filed:

Nov 10, 1987

Appl. No.:

7/119322

Inventors:

Frank J. Russold - Wichita KS
Fred L. Laqua - Wichita KS

Assignee:

Great Plains Industries, Inc. - Wichita KS

US Classification:

D23231

US Patent:

48591556, Aug 22, 1989

Filed:

Oct 21, 1987

Appl. No.:

7/112536

Inventors:

Fred L. Laqua - Wichita KS

Assignee:

Great Plains Industries, Inc. - Wichita KS

International Classification:

F04B 4902
F16K 1704
F16K 1710

US Classification:

417307

Abstract:

A displacement pump bypass valve having an integral pressure modulator in a piston of the valve, the piston located in a bore formed through the pump housing between the pump inlet and pump outlet, the piston having an internal, cylindrical expansion chamber which fluidly communicates with the pump outlet via an opening formed through one end of the piston. A modulator disc is located in the expansion chamber for axial movement therein to vary the expansion chamber volume, and a spring in the expansion chamber urges the modulator disc toward the opening in the expansion chamber.

US Patent:

D383853, Jun 5, 1990

Filed:

Nov 10, 1987

Appl. No.:

7/118964

Inventors:

Frank J. Russold - Wichita KS
Fred L. Laqua - Wichita KS

Assignee:

Great Plains Industries, Inc. - Wichita KS

US Classification:

D15 7

US Patent:

D382091, May 29, 1990

Filed:

Nov 17, 1987

Appl. No.:

7/121997

Inventors:

Fred L. Laqua - Wichita KS
Robert E. Hall - Wichita KS

Assignee:

Great Plains Industries, Inc. - Wichita KS

US Classification:

D15 7