| 摘要 |
<p>A surface cleaner (110) includes a liquid dispensing system (100) comprising a fluid flow path (226) configured to receive a flow of liquid (such as 216), a pump (228), an air purging component (360), and a valve actuator (374). The pump is in line with the fluid flow path and is configured to drive the flow of liquid through the fluid flow path. The air purging component includes an inlet (362) in line with the fluid flow path, an outlet (364), an airflow path (366) connecting the inlet and the outlet, and a valve (368) in line with the airflow path. The valve includes an open position in which the airflow path is open between the inlet and the outlet and a closed position in which the airflow path is closed between the inlet and the outlet. The valve actuator is connected to the valve and is configured to bias the valve in the open position when air is detected in the fluid flow path.
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