Dispenser for concentrated injection

1. A dispenser for a liquid container comprising:

a liquid pump provided with an inlet having an inlet valve and an outlet having an outlet valve;

a liquid chamber in communication with the outlet valve of the liquid pump;

a mixing chamber in communication with the liquid chamber;

an air pump provided with an inlet having an inlet valve and an outlet having an outlet valve, wherein the outlet valve comprises a flexible wall arranged between the liquid chamber and the mixing chamber and projecting substantially transversely of liquid flow through the mixing chamber;

a central opening in the flexible wall; and

a dispensing part provided with an outflow channel with an outflow opening, wherein the outflow channel is in communication with the mixing chamber.

2. The dispenser according to claim 1 , wherein the mixing chamber comprises a central outlet opening which debouches in the outflow channel of the dispensing part.

3. The dispenser of claim 2 , wherein the flexible wall seals around the central outlet opening of the mixing chamber in a static situation.

4. The dispenser of claim 1 , wherein the central opening in the flexible wall is in open communication with the outflow channel of the dispensing part.

5. The dispenser of claim 1 , further comprising a foam-forming element arranged in the outflow channel.

6. The dispenser of claim 5 , further comprising a second foam-forming element arranged in the outflow channel.