Graco Minnesota Inc.

John F Isais, Jr

David M Pittman

Mark T Weinberger

Mark L Bauck

Michael E Bloom

Kenneth Eugene Lehrke

Adam R Friedrich

Vicky J Peterson

An air valving system for a reciprocating piston pump () which uses piston () actuated poppet assemblies () to control the main air valve () shift. The valve exhaust is vented () directly to atmosphere rather than through the main exhaust to ensure reliability. A ramped detent () prevents the air valve () from centering.

Reciprocating piston pump with air valve, detent and poppets

A mechanical proportioner is provided with two pump lowers which are connected together by a yolk underneath an air-operated reciprocating piston pump. The pumps are staggered axially so as to enable overlapping of certain portions thereof thereby enabling the center-to-center distance to be minimized. The mix manifold is constructed in a concentric fashion such that mixed material does not come into contact with the mix manifold until it enters the static mixer at the exit of the manifold which is an easily disposable and replaceable part. The purge solvent valves on the mix manifold are each provided with an extension of their respective handles. If either purge valve is in its open position, a separate interlock handle operating the A and B side valves at the manifold inlet is prevented from opening. Similarly, if the interlock handle operating the A and B side valves is open, the purge valves cannot be opened.

Mechanical proportioner

Growing community of inventors

Brooklyn Park, MN, United States of America

John F Isais, Jr