| 摘要 |
<p>A supply tube isolation system for use with a chemical delivery system (100) includes a feedback tube (704) connected between a manifold (130) and a supply tube (702) connecting a chemical supply container and a chemical pump (142) of the chemical delivery system. A controllable valve means (706,708;802) is provided at or near the junction of the feedback tube (704) and the supply tube so as to effectively segment the supply tube into first and second portions, where the first supply tube portion (702a) is that which is connected between the valve means and the manifold, and the second tube portion (702b) is that which is connected between the valve means and the chemical supply container. During delivery of the chemical to one or more destinations within the delivery system, the valve means is positioned so as to close the feedback tube (704) 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> |
