| 摘要 |
Apparatus for the selective dispensing of a liquid has a conduit junction having a single output branch and which selectively receives the liquid under pressure at a liquid input branch and a gas under pressure at a gas input branch. Valve means apply either the gas or the liquid to the conduit junction, which has a chamber forming a common fluid-passage between the two input and single output branches. The conduit junction maintains a stable interface between the input fluid being transferred to the output branch and the other input fluid, so that the liquid is dispensed only when specified, and then with minimal inclusion of the gas, thereby making possible the accurate and precise dispensing of the liquid.
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