Patent ID: 8449840

Claim:
A dispensing device, comprising: a dispensing nozzle comprising a leading end; a water feed pump; a water feed valve; a tubing; a change-over valve separate from the water feed valve; a vacuum means; a dispensing pump connected to the tubing, wherein the tubing is disposed between the dispensing nozzle and the water feed pump; wherein the vacuum means is separate from the water feed pump and the dispensing pump; wherein the water feed pump is configured to supply deaerated water into the tubing to fill up the tubing to the leading end of the dispensing nozzle; wherein the water feed valve is configured to be closed thereby forming a deaerated water space in the tubing, where the leading end of the dispensing nozzle is open, wherein the deaerated water space is between the dispensing nozzle and the water feed valve; wherein the dispensing pump is separate from the water feed pump and is configured to be operated to perform a suction and an exhaust action using the dispensing nozzle, wherein the vacuum means is configured to maintain a negative pressure state in the tubing via the change-over valve; wherein the vacuum means is connected to the deaerated water space via the change-over valve; and wherein the change-over valve is configured to be opened such that the vacuum means negatively pressurizes the deaerated water space such that bubbles in the deaerated water supplied to the deaerated water space are removed; wherein the dispensing device further comprises control circuitry programmed to cause the change-over valve to repeatedly open to remove bubbles in the deaerated water, until the control circuitry determines that no bubbles exist in the deaerated water space.