Dezurik, Inc.

Other

Graco Minnesota Inc.

Adam L Kalthoff

Timothy Sean Roman

Forrest Halvorson

Kurt R Sjodin

Duane G Plumski

Vincent M Sabalvaro, Iii

Larry Larson

Duane Plumski

Vincent M Sabalvaro

The present disclosure is directed to a combination air valve that uses buoyancy to lift seals into place, preventing media from escaping from the valve. Once the seals are in place, pipeline pressure is used to open and close the valve. The combination air valve includes a low flow vent configured with a pressure equalizing configuration allowing for reduced extrusion forces along the low flow vent, allowing vertical movement of a float shaft at high valve gas pressures with reduced forces.

Combination air valve

The present disclosure is directed to a combination air valve that uses buoyancy to lift seals into place, preventing media from escaping from the valve. Once the seals are in place, pipeline pressure is used to open and close the valve. The combination air valve includes a piston assembly which includes a main disc, a piston head located above the main disc, a float below the main disc, and a float shaft joining the float to the piston. When no media is in the valve the float is at the bottom of the valve and the main disc is down, allowing gases to leave the valve. The float is lifted as media enters the valve, thus using buoyancy to lift the main disc into place, preventing media from escaping from the valve. Once the seals are in place, pipeline pressure is used to open and close the valve.

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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Albany, MN, United States of America

Adam L Kalthoff