| 摘要 |
A liquid dispensing apparatus (10) includes a dispenser module (20) having a distribution passage (22) and an outlet aperture (32) configured to dispense pressurized liquid. The liquid dispensing apparatus (10) also includes a snuff back module (12) including a snuff back shaft (36) extending into fluid communication with the distribution passage (22). At the end of a dispensing cycle, an actuating mechanism (60) of the snuff back module (12) actuates movement of the snuff back shaft (36) from an extended position to a first and/or second withdrawn position, thereby pulling pressurized liquid back from the outlet aperture (32) to cleanly cut off liquid flow. A controller (106) operates the actuating mechanism (60) to move the snuff back shaft (36) between the extended position, the first withdrawn position, and the second withdrawn position, which enables different liquid volumes to be pulled back depending on the size of the outlet aperture (32).
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