Graco Minnesota Inc.

Justin G Paulson

David John Thompson

Jeromy D Horning

August F Legatt

A piston rod () for a spray fluid pump includes an interior pumping chamber (), one or more channels () formed on the exterior of the piston rod, and one or more side bores () extending through the piston rod and in fluid communication with the interior piston chamber and one or more channels. The one or more channels () extend at least partially axially and are open along a length of the channel. The one or more channels are angled offset with respect to the reciprocation axis for imparting a rotational moment on the piston rod to cause rotation of the piston rod during reciprocation of the piston rod. A spray fluid pump comprising such piston rod is also disclosed.

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Fridley, MN, United States of America

Justin G Paulson