| 摘要 |
PROBLEM TO BE SOLVED: To prevent the back flow of a sprinkling solution to a solute source during the stop of sprinkling due to the changeover of a changeover valve. SOLUTION: In this liquid sprinkler 1 equipped with a confluent part 9 where the solvent W of the solute source 3 meets with the solute S of the solute source 4, the mixing flow channel 10 communicating with the suction port 2 of a sprinkling pump 5 from the confluent part 9, the discharge flow channel 18 communicating with the discharge port 6 of the sprinkling pump 5, the changeover valve 19 interposed in the discharge flow channel 18, a return flow channel 23 for returning the sprinkling solution K to the mixing flow channel 10 from the changeover valve 19, a flow rate sensor 20 for detecting the flow rate of the sprinkling solution K and a control device 17 for automatically controlling the amount of the solute S delivered to the confluent part 9 on the basis of the signal obtained from the flow rate sensor 20, a check valve 11 for preventing the back flow of the sprinkling solution to the confluent part 9 is interposed between the connection part 24 of the return flow channel 23 to the mixing flow channel 10 and the confluent part 9. COPYRIGHT: (C)2008,JPO&INPIT
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