Abstract：With the flexible waterproof diaphragm set in the closed dosing tank,a new type of differential pressure diaphragm dosing device is designed. Its working principle is different from that of the existing products.The new device uses reducing valve set in the water pipe to produce differential pressure.The differential pressure has an effect on closed dosing tank and completes the dosing. The flexible waterproof diaphragms separate the water and reagent, keeping the dosing density unchanged. The connection among pipeline pressure,rate of flow and dosing flow was analyzed, finding out that dosing flow and pipeline pressure of the new device are irrelevant, but in direct proportion to the rate of pipeline flow. The dosing device has dosing flow self-adjusting function and can adapt to the changes of the main pipeline flow to guarantee dosing uniformity. The experimental result shows that the pipeline head loss of the device is less than 0.5 m and dosing density error under the same flow of different time is less than 4%, dosing density error under different flow is less than 2%. Changing the setting of the relief valve can adjust the dosing proportion, to meet the needs of different users. The dosing device will not reduce the pipeline pressure sharply and the dosing concentration is stable. Therefore, the device can be widely used in agricultural irrigation facilities, dosing and fertilizing of the drip irrigation system.
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