Surface cleaning apparatus

1. A surface cleaning apparatus, comprising:

a housing adapted for movement across a surface to be cleaned;

a supply tank for holding a supply of liquid;

a distributor for delivering fluid to the surface to be cleaned;

a regulator tank fluidly coupled to the supply tank to regulate a flow of liquid from the supply tank to the distributor, the regulator tank comprising:

a chamber for holding a volume of liquid from the supply tank and a volume of air;

a vent in fluid communication with ambient air for venting ambient air into the chamber; and

a tank outlet in fluid communication with the distributor;

a conduit extending through the chamber of the regulator tank and having an inlet end in fluid communication with the supply tank and an outlet end in fluid communication with the tank outlet; and

at least one port provided in the conduit between the inlet end and outlet ends of the conduit;

wherein the at least one port is in fluid communication with the chamber and the conduit is fluidly isolated from the chamber save for the at least one port and wherein as liquid flows out of the supply tank, the at least one port exchanges liquid and air between the chamber and the supply tank to regulate a steady flow of liquid through the outlet regardless of the volume of liquid in the supply tank.

2. The surface cleaning apparatus of claim 1 wherein the conduit extends through the chamber from the supply tank to the tank outlet.

3. The surface cleaning apparatus of claim 1 wherein the supply tank is positioned above the regulator tank such that liquid flows out of the supply tank by gravity feed.

4. The surface cleaning apparatus of claim 1 wherein the supply tank is positioned above the conduit such that liquid flows into the conduit from the supply tank by gravity feed.

5. The surface cleaning apparatus of claim 1 wherein the supply tank comprises a supply tank outlet in fluid communication with the inlet end of the conduit.

6. The surface cleaning apparatus of claim 1 wherein the vent comprises a valve controlling venting of ambient air into the chamber.

7. The surface cleaning apparatus of claim 6 , wherein the valve comprises an umbrella valve provided on a wall of the regulator tank.

8. The surface cleaning apparatus of claim 1 , further comprising a tubing coupled with the tank outlet, wherein the tubing comprises a coating for minimizing aqueous surface tension between the tubing and a liquid flowing through the tubing.

9. The surface cleaning apparatus of claim 8 , wherein the tubing is further treated with an antimicrobial additive.

10. The surface cleaning apparatus of claim 1 , further comprising a control valve in fluid communication with the tank outlet to control the flow of liquid out of the supply tank.

11. The surface cleaning apparatus of claim 10 wherein the control valve is provided below the supply tank and regulator tanks such that liquid flows out of the supply tank by gravity feed.

12. The surface cleaning apparatus of claim 1 , further comprising a filter provided in the conduit.

13. The surface cleaning apparatus of claim 1 wherein the housing comprises:

a base housing adapted for movement across the surface to be cleaned; and

an upper housing provided on the base housing and comprising a handle to facilitate movement of the base housing across the surface to be cleaned;

wherein the distributor is provided on the base housing.

14. The surface cleaning apparatus of claim 13 , wherein and the supply tank and the regulator tank are provided on the upper housing.

15. The surface cleaning apparatus of claim 13 , and further comprising a cleaning pad attached to the base housing, wherein the distributor is positioned to deliver fluid to the cleaning pad.

16. The surface cleaning apparatus of claim 13 , and further comprising:

a flow controller operable to control the flow of liquid out of the supply tank; and

a trigger provided on the handle and operably coupled with the flow controller.