Graco Minnesota Inc.

Ronald A Flor

Todd L Johnson

Bradley H Hines

Brian W Koehn

David L Breeser

Daniel L MacDonald

Tera D Brezny

Nathan C Grossman

A diaphragm for use in a pump includes a cover configured to contact fluid to pump the fluid and a backing disposed at least partially within the cover. The backing includes a flexible plate that extends outward relative to a core of the backing, the flexible plate configured to flex during reciprocation of the diaphragm. The cover is formed from a first polymer and the flexible plate is formed from a second polymer.

Overmolded diaphragm for use in a pump

A positive displacement pump includes two fluid flow paths, two center sections with a common fluid valve, a changeover valve, and three fluid displacement members. Each center section contains a diaphragm shaft, and the two sections are separated by the third diaphragm. In low-pressure mode the pump operates as a typical positive displacement pump with pumping fluid supplied to one center section and the changeover valve allowing the fluid to freely circulate within the second center section. In high-pressure mode, the changeover valve is switched and the changeover valve allows the common fluid valve to supply pumping fluid to both center sections to drive the fluid displacement members therein, which generates a higher outlet fluid pressure.

High-pressure to low-pressure changeover valve for a positive displacement pump

Diaphragm pump

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Anoka, MN, United States of America

Ronald A Flor