| 摘要 |
<p>A finger-operable pump for dispensing liquids comprises a feed chamber for receiving a liquid product from an external supply via a feed valve, a discharge chamber communicating with the feed chamber from which the product is discharged to atmoshpere, and a discharge valve having a displaceable member which is displaced to open the valve only after the liquid under increasing hydraulic pressure has passed from the feed chamber to : the discharge chamber.</p> |
