| 摘要 |
PROBLEM TO BE SOLVED: To prevent main constituent from flowing reversely in a pipeline for additional injection when an additional agent is additionally and directly injected into the main constituent of fluid, even if a pump for additional injection fails or suffers from an accident, and provide an injection valve capable of well mixing constituent to be additionaly injected with main constituent. SOLUTION: An injection valve for injecting other fluid into a fluid in a container or a pipeline 1, a small diameter part 13a and a large diameter part 13b are provided for a valve stem 13 opening/closing an injection hole 16, elasticity is energized for the valve stem 13 to the direction that the injection hole 16 is closed, let the pressure of fluid to be injected, act on the large diameter part 13b of the valve stem 13, the opening/closing operation of the valve stem 13 is controlled by means of a balance between the pressure of fluid itself to be injected and the force of coil spring 23 giving elasticity to the direction that the injection hole is closed, even in a case that a pump for additional injection fails or suffers from an accident, and main constituent can be positively prevented from flowing reversely in the pipeline for additional injection.
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