| 摘要 |
A by-pass valve metering system for praying agricultural chemicals to the soil from a driver-operated moving vehicle through nozzles substantially independent of pump pressure. The system has a by-pass valve which is driver presetable prior to spraying. The by-pass valve is driver adjustable while the vehicle is moving for increasing or decreasing nozzle flow. Indicating means readable by the driver from the moving vehicle during praying indicates spray rate through the nozzles as a percentage of pump flow.
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