| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a liquid agent dilution device capable of performing stable dilution use of a liquid agent with a high dilution rate.SOLUTION: A liquid agent dilution device has a main flow passage 8 making a solvent pass. The main flow passage 8 branches into a first system 9 and a second system 10, and they newly join each other downstream. The liquid agent dilution device is provided with an ejector pump part communicating with a supply source of a liquid agent and sucking the liquid agent into the solvent by a negative pressure in the middle of the first system 9, the second system 10 joins the first system 9 downstream of the ejector pump part not through the ejector pump part, and the liquid agent dilution device is provided with a changeover device 27 changing over between dilution water discharge in which the solvent passes both the first system 9 and the second system 10, and raw water discharge in which the solvent passes only the second system 10, and reduces a minimum cross section inside a flow passage of the second system 10 when discharging dilution water compared to when discharging raw water.</p> |
