Windshield washer fluid dispensing system

Abstract

A system for automated vending of windshield washer fluid from large volume tanks. In one embodiment the system includes two or more vending control units and a fluid storage system that includes one or more fluid storage tanks mounted at a level above the vending control units. Preferably the fluid storage tanks are mounted to an over head canopy, either on the roof of the canopy or on one of the canopy support columns. Where two or more fluid storage tanks are utilized, fluid equalization conduits connect the storage tanks to each other so that fluid levels in the storage tanks equalize as fluid is added to or withdrawn from any one of the tanks. Two or more fluid dispensing hoses are provided, each one being associated with and controlled by one of the vending control units. Each hose is connected to the fluid storage system and dispenses fluid by force of gravity in response to selective activation of the corresponding vending control unit by a user. Preferably the distal end of the fluid dispensing hose has a dispensing nozzle, a controllable dispensing valve located upstream from the dispensing nozzle, and a check valve disposed between the dispensing valve and the end of the nozzle. The check valve permits fluid to flow toward the nozzle when a pressure differential across the check valve exceeds a predetermined value. Thus, when the upstream dispensing valve is opened, the fluid pressure across the check valve exceeds the predetermined value, opening the check valve and permitting fluid to be dispensed.