Graco Inc.

Dean L Schaffran

Duane D Krohn

Lawrence S Kelly

Donald S Nii

A self-contained liquid manifold attachable to a drive mechanism for a reciprocable pump, the manifold having a pumping cylinder, pressure transducer, pressure control mechanism, drain valve and control mechanism attached thereto, and liquid delivery outlets all forming a part thereof. The manifold and its associated components are removable from the reciprocable drive mechanism by detaching two fasteners. The pressure transducer and control mechanism includes a piston and cylinder removably indexed in a manifold bore, and an electrical switch in an adjacent housing with a ball bearing on the piston and a push rod resting on the ball bearing, the other push rod end constrained by a ball and spring combination.

Liquid pump pressure control system

A system for pumping liquid materials with reciprocating pumps driven by hydraulically operated motors, wherein the pressurized hydraulic oil which is used to drive the hydraulic motors is supplied via reciprocating proportioners. The reciprocating proportioners are driven by a reciprocating air motor operated under predetermined air pressure. The system operation is characterized in that, under blocked output pressure conditions, the air motor will inherently stall and thereby limit the pressure of the hydraulic oil acting to drive the hydraulic motors, which therefore limits the pumping pressure applied to the reciprocating pumps, and limits the output pressure of the pumped liquid materials.

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Westminster, CO, United States of America

Dean L Schaffran