| 摘要 |
PURPOSE:To enable a continuous and stable conveyance of slurry under pressure through an equipment in which a high pressure pump for supplying a driving liquid for the pressure conveyance of the slurry is connected to the top of a supply chamber. CONSTITUTION:When a high pressure pump 4 and a slurry pump 3 are working, a changeover valve 13 in a driving liquid drain pipe 11 is first opened to drain a driving liquid out of the upper part of a supply chamber 1 and simultaneously fill slurry into the lower part of the chamber through a check valve 7. When a proximity switch 14 is operated by the ascent of a float valve 2, the changeover valve 13 is closed and a changeover valve 12 in a driving liquid supply pipe 10 is opened to feed a driving liquid of high pressure into the supply chamber 1 to send the slurry under pressure to a conveyance pipe 9 through a check valve 8. The high pressure pump 4 has such a characteristic that the difference between the rated flow quantity point pressure and the shutoff pressure is always larger than a pressure required to open the check valves 7, 8.
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