Other

Graco Minnesota Inc.

Kurt R Sjodin

Timothy Sean Roman

Adam L Kalthoff

In a reciprocating piston pump, pistonhas first or upper endand second or bottom endhaving inletand outletbores respectively located therein. Inlet checkis located in borewhile outlet checkis located in bore. As can be seen in FIG., each of boresandbranches into three (in the preferred embodiment) flow paths which alternate and are intertwined. It is the unique flow paths incorporating both the inlet and outlet check valves in the piston that are the key features of the invention.

Internal bellows pump fluid path

The pump () prevents fluid leaks when a bellows () ruptures in a pump incorporating a flexible bellows () as a primary seal and prevents fluid from leaking out of a pump () or the pump () ingesting air in the event of a bellows rupture. This is done by adding an additional seal () after the bellows and a large volume backup chamber

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Cedar, MN, United States of America

Kurt R Sjodin