Adjustable additive delivery systems and dispensing closure valves for the same

An additive delivery system comprising:

• a base for mounting the additive delivery system on a container adapted to contain a supply of base liquid;
• a mixing nozzle cooperatively associated with the base for facilitating mixing of additive with the base liquid, the mixing nozzle including a central mixing nozzle additive flow passage, the mixing nozzle further including at least two base liquid flow passages arranged in a radial pattern around the central mixing nozzle additive flow passage;
• a flow metering component cooperating with the mixing nozzle;
• an additive adjustment actuator adapted to rotate relative to the base, the additive adjustment actuator including a spout defining a spout flow passage, the at least two base liquid flow passages and mixing nozzle additive flow passage being arranged to supply base liquid and additive, respectively, to the spout flow passage;
• a base liquid flow valve arranged to prevent backflow through the at least two base liquid flow passages;
• the spout having a plurality of spokes supporting a button-shaped projection in a dispensing end of the spout, the plurality of spokes defining intervening spout flow passages;
• and
• a dispensing closure valve assembly disposed on the spout and having a valve membrane arranged to extend over the button-shaped projection and intervening spout flow passages,
• wherein the valve membrane is configured to close to prevent discharge of liquid from the spout in response to a pressure below a threshold pressure required to cause flow through the base liquid flow valve.