| 摘要 |
A conveying conduit is maintained completely filled with dry sand by an air pressurized supply from a refill vessel. The sand is transferred by the conduit to one or more dispensing vessels maintained at a substantially lower pressure than the conveying conduit. The sand is fluidized and selectively discharged from the dispensing vessel under this substantially lower pressure while the sand in the conduit is maintained pressurized when flowing as well as in a static condition when discharge from the dispensing vessel is stopped.
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