Diversey Lever, Inc.

Robert G Cords

Michael A Steed

Steven S Newman

A supply tube isolation system for use with a chemical delivery system includes a feedback tube connected between the manifold and each of the supply tubes connected between the chemical supply containers and the chemical pumps of the chemical delivery system. A controllable valve means is provided at or near the junction of the feedback tube and the supply tube so as to effectively segment the supply tube into first and second portions, where the first supply tube portion is that which is connected between the valve means and the manifold, and the second tube portion is that which is connected between the valve means and the chemical supply container. During delivery of the chemical to one or more destinations within the delivery system, the valve means is positioned so as to close the feedback tube and connect the first and second portions of the supply tube. During a subsequent flushing of the delivery system with water, the valve means is positioned so as to connect the first portion of the supply tube to the feedback tube and close the second portion of the supply tube. In this manner, water flushed through the manifold and chemical pump to remove chemical residue therein does not contact chemicals within the supply containers.

Chemical supply tube isolation system

A chemical dispensing system controller is used in conjunction with a mechanism for dispensing specified chemicals and a device that transmits trigger signals to the control system for requesting chemicals to be dispensed. The controller receives and accumulates sequences of the transmitted trigger signals. Each trigger signal sequence is preceded and followed by a period of time of predefined duration during which no trigger signals are received. At least some of the trigger signals in some of the trigger signal sequences are not received simultaneously. Also, the number of distinct chemical feed requests that can be communicated using the accumulated trigger signals exceeds the number of distinct trigger signals. The controller maps a first subset of the accumulated trigger signal sequences into chemical feed requests, each of which requests a quantity of a corresponding chemical. The controller enables the dispensing of chemicals in accordance with the chemical feed requests. A second subset of the accumulated trigger signal sequences are mapped into wash classification codes, each of which identifies a type of wash load to be washed using the dispensed chemicals. The number of distinct wash classification codes that can be communicated using the accumulated trigger signals exceeds the number of distinct trigger signals. When the control system uses a classification dependent feed arrangement, the chemical feed request corresponding to each received trigger signal sequence is determined based on both the current wash load type and the accumulated sequence of trigger signals.

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Santa Cruz, CA, United States of America

Robert G Cords