| 摘要 |
<p>A color changer includes a first passageway (28) and a second passageway (30). A valve (34) is coupled to the first passageway (28) and the second passageway (30) to control color flow between the first and second passageways (28,30). The first passageway (28) is adapted to permit the passage of a color-conserving pig through the first passageway (28). <IMAGE></p> |
