| 摘要 |
<p>A filter system which removes solids from a liquid used in electro-erosion machine 18 comprises a container 7 which receives the soiled liquid and a pump 27 and valve 6 which normally pass the liquid in a forward direction through a filter 10 to a filtrate container 8, shown with an overflow 19 into container 7. When the filter clogs, valve 6 is adjusted to a second position to feed liquid from container 7 through filter 10 in the reverse direction and into a third container 9. Then valve 6 shifts to a third position to feed liquid from container 7 through filter 10 in the forward direction to container 9. Soiled liquid in container 9 is purified, by settling of solids into a removable sump 22 (Fig. 2) or by an auxilliary closed circuit filtration (Fig. 3), and returns to container 7. Finally valve 6 restores the flow to the first position and normal filtering resumes. …<IMAGE>… </p> |
