Patent attributes
A multi-chemical dispensing device comprising a concentrate supply of at least one chemical concentrate, a flow selector valve in fluid communication with said concentrate supply, and at least two proportioners, each proportioner in fluid communication with the flow selector valve. The flow selector valve may include a dilution member comprising one or more aligned orifice pairs, each orifice pair including an first orifice and a second orifice in fluid communication with the concentrate supply. Each orifice has an opening area to provide a known dilution ratio at a known flow rate therethrough. Each proportioner is connected to a supply of motive fluid. The concentrate dispensing device includes a plurality of check valves that close off the system when one of the water supplies is turned on. The plurality of check valves are also configured to allow the chemical concentrate to drain out of the multi-chemical dispensing device using gravity.
