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An apparatus for processing a substrate has a liquid supply unit, a nozzle unit, a first valve and a second valve. The liquid supply unit has an output port and an input port, and a processing liquid is output from the output port. The nozzle unit has a first port and a second port, and the first po

An apparatus for processing a substrate has a liquid supply unit, a nozzle unit, a first valve and a second valve. The liquid supply unit has an output port and an input port, and a processing liquid is output from the output port. The nozzle unit has a first port and a second port, and the first port is connected to the output port of the liquid supply unit. The first valve is connected between the second port of the nozzle unit and the input port of the liquid supply unit. The second valve is connected between the second port of the nozzle unit and the output port of the liquid supply unit. Moreover, the switch states of the first and second valves are opposite in order to control whether the nozzle unit spreads the processing liquid on the substrate.

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What is claimed is: 1. An apparatus for processing a substrate, the apparatus comprising: a liquid supply unit, having an output port and an input port, wherein the output port outputs a processing liquid; a nozzle unit, having a first port and a second port, wherein the first port is connected to

What is claimed is: 1. An apparatus for processing a substrate, the apparatus comprising: a liquid supply unit, having an output port and an input port, wherein the output port outputs a processing liquid; a nozzle unit, having a first port and a second port, wherein the first port is connected to the output port; a first valve, connected between the second port and the input port; a second valve, connected between the second port and the output port, wherein switch states of the first and second valves are opposite to control the nozzle unit and the processing liquid flow into the nozzle unit through both the first and second ports when the second valve is opened; and a third valve, connected between the second valve and the output port. 2. The apparatus of claim 1, wherein the first valve is a normal open valve, and the second valve is a normal close valve. 3. The apparatus of claim 1, wherein the third valve is a normal close valve. 4. The apparatus of claim 1, wherein the third valve is a normal open valve to circulate the processing liquid from the output port to the input port. 5. The apparatus of claim 1, wherein the third valve is a solenoid valve or an air operation valve. 6. The apparatus of claim 1, wherein the apparatus further comprises: a control unit, switching the switch states of the first and second valves by a same signal. 7. The apparatus of claim 1, wherein the liquid supply unit comprises a temperature control device to adjust a temperature of the processing liquid. 8. The apparatus of claim 1, wherein the liquid supply unit comprises a pressurizing device to pressure the processing liquid. 9. The apparatus of claim 1, wherein the first valve is a solenoid valve or an air operation valve. 10. The apparatus of claim 1, wherein the second valve is a solenoid valve or an air operation valve. 11. The apparatus of claim 1, wherein the apparatus further comprises: a plurality of thermal insulation components to maintain a temperature of the processing liquid. 12. An apparatus for processing a substrate, the apparatus comprising: a liquid supply unit, having an output port and an input port, wherein the output port outputs a processing liquid; a nozzle unit, having a first port and a second port, wherein the first port is connected to the output port; a first valve, connected between the second port and the input port; and a second valve, connected between the second port and the output port, wherein switch states of the first and second valves are opposite to control the nozzle unit, the processing liquid flow into the nozzle unit through both the first and second ports when the second valve is opened, and the first port is connected to the output port without though the second valve. 13. The apparatus of claim 12, wherein the first valve is a normal open valve, and the second valve is a normal close valve. 14. The apparatus of claim 12, wherein the apparatus further comprises: a third valve, connected between the second valve and the output port. 15. The apparatus of claim 12, wherein the apparatus further comprises: a control unit, switching the switch states of the first and second valves by a same signal. 16. The apparatus of claim 12, wherein the liquid supply unit comprises a temperature control device to adjust a temperature of the processing liquid. 17. The apparatus of claim 12, wherein the first valve is a solenoid valve or an air operation valve. 18. The apparatus of claim 12, wherein the second valve is a solenoid valve or an air operation valve. 19. The apparatus of claim 12, wherein the apparatus further comprises: a plurality of thermal insulation components to maintain a temperature of the processing liquid.