Two-liquid dispensing systems, refills and two-liquid pumps

A refill unit for a foam dispenser comprising:

• a first container and a second container;
• a first outlet associated with the first container;
• a second outlet associated with the second chamber;
• a bellows mixing chamber located downstream of the first outlet and the second outlet;
• at least one inlet valve associated with the first outlet and the second outlet to allow liquid to flow from the first and second containers into the bellows mixing chamber;
• an outlet valve located downstream of the bellows mixing chamber;
• and
• an outlet nozzle downstream of the bellows mixing chamber.

A refill unit for a foam dispenser comprising:

• a first container for holding a first liquid and a second container for holding a second liquid;
• a first liquid in the first container and a second liquid in the second container;
• a first outlet associated with the first container;
• a second outlet associated with the second container;
• at least one outlet valve associated with the first outlet and the second outlet;
• a variable volume mixing chamber located downstream of the first outlet and the second outlet;
• wherein mixing the first liquid with the second liquid causes the mixture of the first liquid and the second liquid to form a foam;
• and
• an outlet nozzle located downstream of the variable volume mixing chamber;
• wherein compressing the variable volume mixing chamber forces the foam out of the outlet nozzle.

A foam dispenser comprising:

• a carrier for holding a first container and a second container;
• the first container holding a first liquid;
• the second container holding a second liquid;
• the first container and the second container secured to and in fluid communication with a variable volume mixing chamber;
• an actuator for expanding and contracting the volume of the variable volume mixing chamber;
• wherein expanding or contracting the variable volume mixing chamber toward a first volume causes liquid from the at least two containers to enter the variable volume mixing chamber;
• and
• wherein the liquids from the first and second containers mix together to form a mixture and that expands to form a foam;
• and
• an outlet nozzle for outputting the mixture in the form of a foam.