Beverage brewing systems and methods for using the same

1. A brewing system, comprising:

a fluid conduit system;

an air conduit system;

a valve, coupled to the fluid conduit system and the air conduit system;

a pump, coupled to the valve, and

a heater, coupled to an outlet of the pump for heating a fluid pumped by the pump, in which the valve selectively allows access to the fluid conduit system and selectively allows access to the air conduit system such that the pump selectively pumps fluid and selectively pumps air.

2. The brewing system of claim 1 , in which a first port of the air conduit system is coupled to atmospheric pressure.

3. The brewing system of claim 2 , in which the first port of the air conduit system is coupled to a fluid reservoir.

4. The brewing system of claim 3 , in which a first port of the fluid conduit system is coupled to the fluid reservoir.

5. The brewing system of claim 4 , in which the pump pumps air through at least a portion of the fluid conduit system when the pump selectively accesses the air conduit system.

6. The brewing system of claim 5 , in which the valve at least partially controls a pressure in at least a portion of the fluid conduit system.

7. The brewing system of claim 6 , in which the valve is a solenoid valve.

8. The brewing system of claim 7 , in which a volume of fluid passing through the pump is measured by monitoring electrical current draw of the pump.

9. A brewing system, comprising:

a fluid conduit system;

a heater;

a pump, coupled to the fluid conduit system and coupled to an inlet of the heater, in which a volume of fluid passing through the pump is measured by monitoring an electrical current draw of the pump, wherein a pressure in the fluid conduit system is regulated by monitoring the electrical current draw of the pump; and

a valve, coupled to the pump, in which the valve selects a pumping medium to be delivered to the pump, wherein air is delivered to the pump as the pumping medium.

10. The brewing system of claim 9 , in which the air is pumped through at least a portion of the fluid conduit system.

11. The brewing system of claim 10 , in which the air is pumped through the portion of the fluid conduit system after a brew cycle.

12. A method for brewing a beverage, comprising: pumping a fluid at least partially through a first conduit to a heater;

heating the fluid after the fluid has been pumped through the first conduit and before the fluid is delivered to a cartridge containing a beverage medium;

switching a valve when a desired amount of the fluid has been pumped to the cartridge heater; and

pumping air through the first conduit to purge at least a portion of the fluid from the first conduit.

13. The method of claim 12 , further comprising measuring an electrical current draw of a pump when the pump is pumping said fluid; and

determining a volume of fluid delivered to the cartridge based at least in part on the measured electrical current draw of the pump.

14. The method of claim 13 , in which the first conduit is coupled to a reservoir.

15. The method of claim 14 , in which the portion of the fluid purged from the first conduit is purged to the reservoir.

16. The method of claim 15 , further comprising determining a pressure in the cartridge based at least in part on the measured electrical current draw of the pump.

17. The method of claim 16 , in which the pump is a tri-chamber diaphragm pump.

18. The brewing system of claim 9 , in which a first port of the fluid conduit system is coupled to a fluid reservoir.

19. The brewing system of claim 9 , in which a valve at least partially controls a pressure in at least a portion of the fluid conduit system.

20. The brewing system of claim 19 , in which the valve is a solenoid valve.