| 摘要 |
A pneumatic feeder system (1) includes a pressure vessel (2) coupled to a telescopic metering pipe (18) having a first ball valve (14) at its entry and a second ball valve (22) at its exit, the second ball valve being perforated at (26) to provide a vent. The volumetric capacity of pipe (18) is variable and determines the quantity of material to be fed in a slug form through a conveying pipe to the point of use, an air knife or injector (16) being provided to propel the charge of material from the metering pipe along the conveying pipe.
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