| 摘要 |
PURPOSE:To enable both the amount of injected water and the amount of reverse water flow to be reduced associated with a shorter shifting time provided between processes preventing fishes from being damaged by arranging a high pressure injection pipe in the cylinder of check valves at both suction and discharge port sides which are arranged on the lower side of a vacuum tank so as to inject water before the valve is closed. CONSTITUTION:Water which contains fishes, is sucked up to a vacuum tank 1, then, the sucking is stopped when the tank 1 is full of the water with a sensor 11 activated. This allows an electromagnetic valve 38 to be opened and another electromagnetic valve 44 to be closed. This causes the high pressure water to be injected into a check valve 16 from an injection pipe 27 allowing fishes in a valve cylinder 21 to be discharged K and K'. Subsequently, a valve 38 is allowed to be closed and a valve 39 is allowed to be opened permitting the high pressure water to be injected from an injection pipe 28 against the back of the valve in itself. Then, the valve 14 is opened and the valve 39 is closed allowing the remaining fishes in a check valve 19 at the discharge port side to be similarly discharged. This configuration enables both the amount of injected water and the amount of reverse water flow to be reduced preventing fishes from being damaged.
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