| 摘要 |
<p>A supply tube isolation system includes a feedback tube connected between a manifold and a supply tube. A controllable valve means effectively segments the supply tube into first and second portions. During delivery of a chemical to one or more destinations, the valve means is positioned so as to close the feedback tube and connect the first and second portions of the supply tube. During a subsequent flushing of the delivery system with water, the valve means is positioned so as to connect the first portion of the supply tube to the feedback tube and close the second portion of the supply tube. In this manner, water flushed through the manifold and chemical pump to remove chemical residue therein does not contact chemicals within the supply container.</p> |
